Compaq Software Product Description ___________________________________________________________________ PRODUCT NAME: Compaq DECnet-Plus Version 7.2-1 for OpenVMS VAX SPD 25.03.44 Description Compaq DECnet-Plus Version 7.2-1 for OpenVMS VAX (formerly known as DECnet/OSI) is an implementation of Phase V of the DIGITAL Network Ar- chitecture (DNA) for the OpenVMS VAX operating system. Compaq DECnet-Plus integrates DECnet and Open Systems Interconnection (OSI) network protocols, allowing both stacks to share integrated net- work functions up to the Transport layer. Upper layers have been im- plemented as separate towers, allowing existing DECnet and OSI appli- cations to share the integrated Transport layer. Existing DECnet Phase IV and new DECnet and OSI applications are supported by DECnet-Plus. In combination with TCP/IP protocol stacks, OpenVMS systems can par- ticipate in multivendor, multiprotocol networks adhering to open net- working standards. Compaq DECnet-Plus for OpenVMS features include: o The ability to run DECnet and OSI applications over TCP/IP trans- ports. o Continued support for 32-bit network applications. o Host-based routing, which includes communication with nodes run- ning DECnet Phase IV and OSI protocols, FDDI large packets, and X.25 switched and permanent virtual circuits. o FAST configuration option, which allows quick configuration upgrades from Phase IV to Phase V. o X.25 network management interface, providing efficient wide area network (WAN) management. July 1999 AE-NJ32T-TE o The ability to configure all members of a cluster from any clus- ter member. o The ability to generate an OpenVMS audit event when a connection is established. o OSI application programming interfaces (APIs). o Expanded naming options, allowing the use of a larger Local names- pace, DECdns, and/or DNS/BIND as naming services. o Routing segregated mode to allow the Routing layer to choose a Phase IV router for those packets having a Phase IV compatible address. (Packets having a Phase V extended address are sent to a Phase V router by default.) This is a configurable option. o Reverse path caching to capture path information for later use in reaching remote systems. o Increased network size, supported through the use of ISO OSI ad- dressing. o Simplified installation and configuration process. o The Network Control Language (NCL). Network management is based on DNA CMIP, Compaq's implementation of the OSI international stan- dard Common Management Information Protocol. o A graphical network management user interface, net$mgmt, for im- proved network management, using NCL. o An NCP (Network Control Program) emulator to facilitate installa- tion of layered products written for DECnet Phase IV. o Installation using the POLYCENTER Software Installation utility. o Support for topologies using multicircuit and multihomed end nodes. o Dynamic connections over X.25 networks. Compaq DECnet-Plus for OpenVMS includes OSI implementation in accor- dance with current U.S. and U.K. GOSIP requirements: 2 o Application, Presentation, and Session layers - File Transfer, Access, and Management (FTAM) application - Virtual Terminal application - Applicaton Service Elements (ASEs), including ACSE (Association Control Service Element) o Transport layer classes 0, 2, and 4 o Lower layers - OSI addressing formats, supporting large network topologies - End system to intermediate system (ES-IS) routing - Connectionless Mode Network Service (CLNS) over local area net- work (LAN), wide area network (WAN), and X.25 - Logical Link Control type 2 (LLC2) for Connection-Oriented Net- work Service (CONS) over LAN - Data Link layer, supporting High-level Data Link Control (HDLC) for wide area communications, ISO 8802-3 (Ethernet CSMA/CD) and FDDI LANs, and DDCMP for backwards compatibility. HDLC support includes the LAPB (Link Access Protocol Balanced) protocol for X.25 communications. - Physical layer, with CSMA/CD, HDLC, and FDDI devices supported. Compaq DECnet-Plus for OpenVMS offers task-to-task communications, file management, downline system and task loading, network command termi- nals, and network resource sharing capabilities using DNA, OSI, and TCP/IP protocols. DECnet-Plus for OpenVMS communicates with adjacent and non-adjacent DECnet Phase IV, PATHWORKS, DECnet-Plus implementa- tions on other OpenVMS systems, ULTRIX, and DIGITAL UNIX systems, as well as systems running TCP/IP transports and on OSI-compliant sys- tems from other vendors. OpenVMS programs written in native-mode programming languages can use DECnet-Plus for OpenVMS capabilities. 3 Depending on the system configuration, networks combining Compaq DECnet- Plus for OpenVMS systems with other DECnet, OSI, and TCP/IP products may limit the functions available if all products do not support equal features. Data Link Layer Compaq DECnet-Plus for OpenVMS uses asynchronous, Ethernet and FDDI communications controllers to interface with other network nodes. LAN connectivity is provided by the CSMA/CD and FDDI controllers and drivers supporting ISO 8802-2 Logical Link Control (LLC) Type 1 con- nectionless service and ISO 8802-3 LLC Type 2. Compaq DECnet-Plus also supports Ethernet Version 2 packet formats on CSMA/CD devices. Use of FDDI packets larger than 1500 bytes requires a Phase V router on the FDDI LAN. As with cluster alias support, you can configure the Phase V router to run the Phase IV distance vector routing protocol or the Phase V link state routing protocol. Supported synchronous devices allow for the use of DDCMP, DIGITAL HDLC, LAPB/E and SDLC protocols. BISYNC and GENBYTE protocols are also sup- ported on some options. WAN device drivers are required by X.25 to es- tablish host-based wide area connections. Synchronous controllers use DDCMP or HDLC, when connected either di- rectly or through modems, to provide full- or half-duplex communica- tions over point-to-point lines. Synchronous DDCMP multipoint trib- utary connections are also supported. Asynchronous controllers use DD- CMP, when connected either directly or through modems, to provide only full duplex communications over point-to-point lines. Error correct- ing and data suppression modems are not supported. Asynchronous lines are supported only to other systems running DECnet- Plus for OpenVMS VAX, DECnet-VAX, DECnet-RSX, and DECnet-DOS. 4 DDCMP operation is not supported in cases where an asynchronous phys- ical communications line is emulated by lower-level protocols or com- munications subsystems. Examples of this include X.29 Virtual Termi- nals, asynchronous connections as emulated by terminal servers, and connections through data switches. Compaq DECnet-Plus for OpenVMS allows up to four circuits to be de- fined and operational on an end system. This capability allows a sin- gle end system to be connected to up to four separate LANs or WANs. Compaq recommends that the circuits be equal in capacity and connec- tivity. X.25 The Compaq DECnet-Plus for OpenVMS VAX license includes the right to use X.25 Access software, formerly known as VAX P.S.I. Access. The right to use X.25 Native Mode software, formerly known as VAX P.S.I., re- quires an additional license. See the Optional Software section of this SPD for ordering information. The X.25 software in Compaq DECnet-Plus for OpenVMS is backward compatible with systems running the older X.25 Native Mode products. Applications written to the older X.25 inter- faces will continue to run, unchanged, with the X.25 software supported on DECnet-Plus. The X.25 Native Mode software allows suitably configured DECnet-Plus systems to connect to PSDNs that conform to CCITT recommendation X.25 (1980 or 1984) and/or to International Standards (ISO) 7776 and 8208. This allows a DECnet-Plus system to function as data terminal equip- ment (DTE) or be addressed as data circuit terminating equipment (DCE) as follows: o A packet-mode DTE connected to a supported PSDN (supported PSDNs are listed in Table 4) conforming to CCITT Recommendation X.25 (1980, 1984) o A packet-mode DTE connected to a CSMA/CD LAN conforming to ISO 8802- 3 using ISO Logical Link Control Type 2 (LLC2) as specified in ISO 8881 5 o A packet-mode DTE/DCE connected to a DCE/DTE conforming to ISO 7776 and 8208 You can configure X.25 for native operation to support direct connec- tions from a VAX system to one or more PSDNs, each of which may have one or more DTEs. The software also allows communication with any non- Compaq X.25 system on the same LAN that supports the ISO Logical Link Control Type 2 (LLC2) protocol. Direct access to a PSDN (using the supported device drivers) requires an X.25 license. See the Optional Software section. X.25 Access Software The X.25 Access software uses a connector node to provide the phys- ical connection to a PSDN. A connector node can be an X25Router 2000 (SPD 28.86.xx), a DEC X.25gateway 100/500 (SPD 32.97.xx), a DECNIS router (SPD 36.95.xx), or other similar routers. DECnet-Plus logical links are established by OpenVMS to connect the X.25 Access system to the X.25 Connector system. These links may use any supported DECnet-Plus communications path between the X.25 Access system and the Connector system, provided they do not use an X.25 con- nection. X.25 Access uses these links to transmit X.25 or X.29 mes- sages between the Connector system and the X.25 Access system. Note that successful use of an X.29 connection, either for incoming X.29 calls or by means of the host-based PAD (packet assembler/disassembler) utility supplied with X.25 Access, depends on the DECnet-Plus circuit between the Access and Connector system having a low response time. This configuration requires high-speed DECnet-Plus connections and few intermediate routing systems. A single X.25 Access system can connect to one or more Connector sys- tems concurrently, and hence access all PSDN(s) accessible from those Connector systems. When X.25 Access is used, one of these Connector systems/PSDN combinations must be established as the default gateway for outbound and inbound traffic. Features 6 The X.25 software provides the Connection-Oriented Network Service (CONS) to allow mapping between a destination NSAP address and a destination DTE address according to ISO 8348. The X.25 software can be used in the following ways: o Process-to-process (X.25) communications o Process-to-terminal (X.29) communications o Terminal-to-process (X.29) communications Process-to-Process (X.25) Communications The X.25 software provides access for OpenVMS user programs written in VAX MACRO and high-level languages such as VAX FORTRAN. The X.25 software does not support programs executing in PDP-11 compatibility mode. The X.25 programming interface allows application programs to access the service interface to the packet level by means of the standard Open- VMS QIO interface. Functions include setting up and breaking network connections, data transmission and reception, sending and receiving interrupt messages, and resetting virtual circuits. The interface al- lows splitting and recombining of messages that are longer than the packet size selected for the circuit. The X.25 programming interface enables an application program using OpenVMS system services to communicate with complementary software on other systems (Compaq or non-Compaq DTEs) accessible through the X.25 connection. Process-to-Terminal and Terminal-to-Process (X.29) Communications The X.25 software supports terminal communications according to CCITT recommendations X.3, X.28, and X.29 for outgoing and incoming termi- nal traffic. X.25 native users may make outgoing calls to other Compaq or non-Compaq CPUs, or suitable network PADs accessible through a PSDN, using the X.29 programming interface or by using the host-based PAD. The PAD fa- cility accepts DCL-style commands or CCITT X.28 commands. 7 The X.29 interactive terminal interface allows remote asynchronous ter- minals (character-mode DTEs) connected to the network to communicate with the X.25 host in a manner similar to local terminals. Dissimi- larities might appear as a result of delays caused by the PSDN(s) and the various PAD parameter settings chosen by the user or peculiar to the PSDN(s). In this case, the remote PAD must convert code between ASCII and the code the terminal uses. Note that there may be some re- strictions imposed by the PSDN(s). Terminal parameters defined in the X.3 recommendation are supported explicitly. Network-specific enhancements or extensions to the X.3 pa- rameters are available at both the X.29 programming interface and the host-based PAD user interface. Terminal processes that depend on these extensions might cause problems when used on other PSDNs or when ac- cessing one PSDN through another (for example, international access). The X.29 terminal interface is compatible with the local terminal in- terface, except for those facilities where the PSDN does not provide adequate support. The X.29 interface includes support for specific X.29 signaling. The host-based PAD employs a DCL-style command syntax, offering the ability to reference the CCITT PAD parameters symbolically, as well as an interface that conforms to the standard CCITT command signals. The host-based PAD also offers the capability of running multiple X.29 sessions using the OpenVMS SPAWN and ATTACH commands. The host-based PAD supports reception of reselection messages to allow X.29 calls to be redirected to another DTE. The X.29 programming interface is similar to the X.25 one and allows an OpenVMS process to control the virtual circuit (for example, to mod- ify PAD parameters or clear a call). You can also use the X.29 pro- gramming interface to make an outgoing call to a remote PAD. The pro- gramming interface allows generation of PAD reselection messages. The maximum number of terminals supported (both local and remote X.29) must not exceed the number supported by OpenVMS. The use of PVCs (per- manent virtual circuits) for X.29 connections is not defined by the 1980, 1984, and 1988 CCITT Recommendations and is not supported. 8 Static X.25 Circuits X.25 allows the use of DECnet-Plus facilities over static X.25 cir- cuits. These circuits are called statically assigned circuits. Virtual Circuits X.25 native software supports both permanent virtual circuits (PVCs) and switched virtual circuits (SVCs). One virtual circuit is used for each: o Incoming or outgoing X.29 terminal connection o X.25 connection, using either a SVC or PVC X.25 native supports a maximum of 4,096 virtual circuits per system. X.25 Access supports a maximum of 900 virtual circuits per system. Note that each virtual circuit requires a certain amount of memory so the number of logical virtual circuits possible on any single system is limited by the available memory. Configuration The X.25 software includes a configuration procedure to configure a VAX system. This menu-based interface allows network managers to cre- ate an initialization script to configure entities and their attributes after initial installation. X.25 Accounting The X.25 Accounting utility enables the system manager to obtain in- formation PSDN usage. X.25 Accounting can extract the information col- lected and display the information directly on a terminal or write the information to a file. It can also extract information for selected records, or produce a summary. The X.25 Accounting utility is compat- ible with the OpenVMS Accounting utility. For incoming X.29 calls, no information about the process/account on to which a user is logged can be stored. However this information may be obtained by correlation with OpenVMS accounting records. 9 X.25 Security X.25 security allows control of both remote DTE access to the X.25 soft- ware, and access to the PSDN(s) by OpenVMS processes. X.25 security allows for access control on the basis of: o The remote DTE numbers involved, either on the basis of individ- ual DTE numbers or groups of DTE numbers with common leading dig- its. o The process making the outgoing call or the application handling the incoming call. X.25 Mail The X.25 Mail utility allows communications through electronic mail between two OpenVMS systems running the X.25 software in native or in access mode. Refer to the OpenVMS Operating System SPD 25.01.xx for more information about OpenVMS Mail. Synchronous Communications Devices The X.25 Native Mode software supports the synchronous communications devices listed in the Communications Devices section, Table 2. The de- vices are different in many respects, particularly in the amount of CPU used. For optimum performance, Compaq recommends the use of a di- rect memory access (DMA) device. Line Interfaces The electrical line interface used for PSDN communications depends on the hardware device used. X.25 Native Mode software provides only the electrical interface of a DTE rather than a DCE, and does not provide clock signals. Therefore, an external clock source (for example, a mo- dem) is required. The range of supported synchronous communications devices covers V.24, V.35 and V.10, RS232, RS422 and RS423 interfaces over point-to-point, 4-wire, synchronous, full-duplex lines at transmission rates up to 256K bits per second. 10 Prerequisite Support For new PSDNs, the customer and Compaq should jointly prepare a Net- work Profile and Customer Support Plan covering all the intended net- work systems, their usage of SVCs, PVCs, and other network facilities, and their support. Without this Network Profile and Customer Support Plan, Compaq cannot support the network connections. Optional Facility Support Support for any given CCITT X.25 facility depends on support for it in the appropriate supported PSDN. Generally, X.25 software is designed to disallow use of facilities that the PSDN does not support. Table 1 shows the options that X.25 is capable of supporting, rather than what X.25 actually supports when used on a particular PSDN. The X.25 prod- uct documentation describes specific facility availability for the sup- ported public PSDNs. ___________________________________________________________________ Table_1:_Optional_X.25_Facility_Support____________________________ Paragraph Number in CCITT X.25 DECnet-Plus Option_______________________(1984)________Support_________________ Extended packet sequence 6.2 Yes numbering Non-standard default 6.10 Yes window size Default throughput 6.11 N/A classes assignment Packet retransmission 6.4 See Note[1] Incoming calls barred 6.5 N/A Outgoing calls barred 6.6 N/A ___________________________________________________________________ [1]Not applicable to a DTE. The X.25 software does not support receiving a level-3 reject packet and does not generate one. 11 ___________________________________________________________________ Paragraph Number in CCITT X.25 DECnet-Plus Option_______________________(1984)________Support_________________ One-way logical channel 6.7 N/A outgoing One-way logical channel 6.8 Yes incoming Closed user group (CUG) 6.14.1 Yes CUG with outgoing access 6.14.2 Yes CUG with incoming access 6.14.3 Yes Incoming calls barred 6.14.4 Yes within CUG Outgoing calls barred 6.14.5 Yes within CUG CUG selection 6.14.6 Yes CUG with outgoing access 6.14.7 No selection Absence of both CUG 6.14.8 Yes selection facilities Bilateral CUG (BCUG) 6.15.1 Yes BCUG with outgoing access 6.15.2 Yes BCUG selection 6.15.3 Yes Reverse charging 6.18 Yes Reverse charging accep- 6.19 Yes tance Local charge prevention 6.20 N/A Network user identifica- 6.21 Yes tion Charging information 6.22 Yes 12 ___________________________________________________________________ Paragraph Number in CCITT X.25 DECnet-Plus Option_______________________(1984)________Support_________________ RPOA selection 6.23 Yes Hunt group 6.24 See Note[ 2] Call redirection 6.25 N/A Called line address 6.26 Yes modified notification Call redirection notifi- 6.27 Yes cation Transit delay selection 6.28 Yes and indication On-line facility regis- 6.1 No tration Non-standard packet size 6.9 Yes Flow control parameter 6.12 Yes negotiation Throughput class negotia- 6.13 Yes tion Fast select 6.16 Yes Fast select acceptance 6.17 Yes D-bit modification 6.3 No Abbreviated address - N/A Datagram queue length - No selection ___________________________________________________________________ [2]The individual DTEs must be assigned their own addresses inde- pendent of the hunt group address. X.25 can then ignore the hunt group. Alternatively, each line on the same CPU can be config- ured as if connected to a separate PSDN; each with the same DTE address. 13 ___________________________________________________________________ Paragraph Number in CCITT X.25 DECnet-Plus Option_______________________(1984)________Support_________________ Datagram service signal - No logical channel Datagram non-delivery - No indication Datagram delivery - No confirmation Call statistics (non- - See Note [3] X.25) ___________________________________________________________________ [3]The X.25 software does not generate these statistics, however, incoming statistics supplied by the PSDN are available in the accounting records and at the programming interface. ___________________________________________________________________ The X.25 software does not support the following items of the CCITT X.25 recommendation: o Multi-link protocol o Use of the D-bit in outgoing packets Wide Area Network (WAN) Device Drivers The WAN device drivers included in Compaq DECnet-Plus for OpenVMS VAX support synchronous communications. The device drivers all offer a sup- ported user ($QIO) interface. The device drivers all support full-duplex and half-duplex operation, where appropriate to the protocol. DDCMP and SDLC device drivers sup- port both point-to-point and multipoint tributary operation. `BISYNC' refers to the IBM implementation of bisynchronous protocol. The GEN- BYTE protocol is a general byte-oriented protocol for use with user- written framing routines on some of the device drivers. 14 The maximum permitted line speed depends on the line interface stan- dard used and must not exceed 19.29 Kbits/second for an RS232 V.24 stan- dard interface. There may be additional line speed restrictions for other line interface standards. For more information, refer to the SPDs for the synchronous interfaces. The Compaq communications layered prod- ucts may not necessarily support operation of the synchronous inter- face at the maximum speed supported by the device driver. Refer to the appropriate Software Product Description for the Compaq communications layered product for precise details of supported configurations. In all cases, the data throughput over the synchronous lines is de- pendent on the user applications and system environment. The device drivers support modem control signal operation. Refer to the product descriptions for the appropriate synchronous interface for details of the modem signals supported by an individual device. Supported controllers are listed in the Communications Devices sec- tion, Table 2. WAN device drivers include a pseudodriver (WANDRIVER) that provides a programming interface to the Data Link level for the LAPB, DEC-HDLC, and DDCMP protocols. Network Layer Compaq DECnet-Plus for OpenVMS supports the Connectionless-Mode Net- work Service (CLNS) and the Connection-Oriented Network Service (CONS). Exchange of routing information between end systems and routers uses the ISO 9542 ES-IS routing protocol. This protocol allows DECnet-Plus systems to autoconfigure as end systems with ISO 9542-conformant routers. Addresses conform to the ISO 8348 Addendum 2 specification, allowing the support of large network topologies. As long as the system address stays within the addressing range of Phase IV systems (up to 1,023 sys- tems per area and up to 63 areas per network), and uses the same ini- tial domain part (IDP), you can use Phase IV or Phase V routers. 15 The Network layer supports the capability of an end system to be mul- ticircuited and multihomed. Multicircuit support allows multiple cir- cuits to be active simultaneously. This functionality increases net- work reliability and data throughput. Multihomed end-system support allows a system to have up to three network entity titles. Segregated routing mode is a settable attribute. It directs routing to choose a Phase IV router for those packets having a destination ad- dress that can be translated to the Phase IV format. All other pack- ets are sent to a Phase V router, if available. The Routing layer is able to cache information about the paths that are used to reach remote nodes. Transport Layer Compaq DECnet-Plus for OpenVMS provides support for: o OSI Transport protocol as specified in ISO 8073 o RFC 1006 and RFC 1859 to allow DECnet and OSI applications to run over TCP/IP o Network Services Protocol (NSP) NSP, RFC 1006, and OSI transports support communications between DEC- net, TCP/IP, and OSI systems. NSP provides backward compatibility with Phase IV DECnet systems. RFC 1859 support for DECnet applications is provided by a kernel in- terface that is implemented on all TCP/IP stacks available for use on the OpenVMS operating system. The supported applications include all licensed DECnet applications as well as layered products and user-written applications that conform to the documented DECnet programming inter- faces. The RFC 1859 is a specification for running OSI applications over TCP/IP. Operation of the FTAM and Virtual Terminal applications over a TCP/IP network is supported along with other layered OSI applications such as X.400 and X.500. 16 A separate TCP/IP stack is required on the same system with DECnet- Plus. See the Optional Software section of this SPD for information on supported TCP/IP products. OSI transport supports transport classes 0, 2, and 4 on connection- oriented networks and class 4 on connectionless networks. OSI transport uses two types of network service: o The Connectionless-Mode Network Service (CLNS) using the Internet protocol (ISO 8473) and ES-IS protocol (ISO 9542) to communicate across linked subnetworks. The inactive subset of ISO 8473 (null internet) is also supported for communications over a single ISO 8802-3 local area network. o The Connection-Oriented Network Service (CONS). Upper Layers Compaq DECnet-Plus for OpenVMS software provides the OSI upper layer stack consisting of Session, Presentation and Application layers. The Application layer provides Association Control Service Element (ACSE); File Transfer, Management, and Access (FTAM); and Virtual Terminal (VT). Compaq DECnet-Plus for OpenVMS also provides a range of DECnet appli- cations and services including file and record access, remote termi- nal access, mail, and phone. Applications Transport Options for Applications You can run applications written to the DECnet upper layers over NSP, OSI, or TCP/IP transports using RFC 1006 and RFC 1859. This includes the network applications that are licensed with DECnet-Plus as well as user-written applications that adhere to the documented DECnet pro- gramming interfaces. The use of TCP/IP transports using RFC 1006 and RFC 1859 does not require any modification to the existing applica- tion. 17 You can run applications written to the OSI upper layers over OSI or TCP/IP transports. Remote File Transfer Compaq DECnet-Plus for OpenVMS supports two upper layer protocols for remote file transfer: the OSI protocol's File Transfer, Access, and Management (FTAM) and the DECnet Data Access Protocol (DAP). FTAM FTAM supports file transfer, access, and management between a DECnet- Plus for OpenVMS system and other systems with software adhering to ISO 8571. In addition, FTAM is conformant with NIST Phase II and Phase III agreements and is certified as being conformant to the released specifications of U.S. GOSIP, U.K. GOSIP, and ENV41204. In addition, FTAM: o Provides users the ability to create, delete, rename, view, and copy files using DCL commands. o Is implemented as an Application Service Element (ASE) of the OSI Application layer. o Acts as the initiator or as the responder in a connection. o Accesses and transfers files with both binary and character data. It supports FTAM-1, FTAM-2, FTAM-3, and NBS-9 document types. Compaq DECnet-Plus for OpenVMS also supports gateway services between FTAM and DAP. A full description of the FTAM services in DECnet-Plus for OpenVMS is provided in Appendix A of this document. DAP The DECnet Data Access Protocol (DAP) supports task-to-task communi- cations, file and record access, and proxy access. 18 Task-to-Task Communications: For most applications, you can use task- to-task communications in a transparent manner where the remote task is treated as a full-duplex, record-oriented device. Transparent op- eration is provided with the following interfaces: system service calls, RMS calls (OPEN, GET, PUT, and CLOSE), and high-level language I/O state- ments (which are mapped to RMS calls). A nontransparent mode of task- to-task communications is offered by means of the system service in- terface that extends the capabilities provided by the transparent mode. These capabilities include support for interrupt messages and multi- ple inbound connect requests. Using Compaq DECnet-Plus for OpenVMS, an OpenVMS program written in a native mode programming language can exchange messages with other user programs. File Access: File access is supported to and from remote DECnet-Plus for OpenVMS systems, transparent to native mode high-level language programs using RMS. User programs can sequentially read, create, and delete files on a remote node. Record Access: User programs can perform record level operations such as GET, PUT, UPDATE, DELETE, FIND, and REWIND to access and modify files residing on a remote OpenVMS node. In addition to sequential access to a file, several other access methods are supported through RMS us- ing DECnet-Plus for OpenVMS. These methods include random access by relative record number, random access by key value, random access by record file address (RFA), and block I/O access by virtual block num- ber. Proxy Access: Remote users can have access to up to 15 proxy accounts on a specific remote system. One proxy account should be designated as the default proxy account on the remote system. Command Language File Management You can use most OpenVMS DIGITAL Command Language (DCL) commands to perform remote file operations. These commands include: ANALYZE, APPEND, BACKUP, CLOSE, CONVERT, COPY, CREATE, DELETE, DIFFERENCES, DIRECTORY, DUMP, OPEN, PRINT, PURGE, READ, SEARCH, SUBMIT, TYPE, and WRITE. The operation of these commands is transparent except for commands that 19 invoke processing on a specific system (for example, SUBMIT/REMOTE and PRINT/REMOTE). Only a node name added to a file specification is re- quired to invoke the network capabilities using one of these commands. Using the COPY command, a user can transfer sequential, relative, and indexed-sequential (ISAM) files between DECnet-Plus for OpenVMS nodes that support compatible file structures and record formats. Users can transfer sequential or relative files with fixed length, variable length, or variable length with fixed control field records between two DECnet- Plus for OpenVMS systems. Similarly, multikeyed indexed files with vari- able or fixed length records are supported. The SUBMIT/REMOTE command allows command files residing on a remote node to be submitted for execution at the remote node. The command file must be in the format expected by the node responsible for execution. DECnet-Plus for OpenVMS allows OpenVMS command files to be received from other systems and executed. The DCL command EXCHANGE/NETWORK allows the transfer of files to or from heterogeneous systems. This command gives users the option to trans- fer file types between MS-DOS, ULTRIX, and UNIX systems and OpenVMS systems regardless of record semantics. Unlike the COPY command, which preserves file and record organization during a file transfer, this command enables the user to modify file and record attributes during file transfer. OSI Application Programming Interfaces (APIs) The OSI application programming interfaces enable users to write dis- tributed applications that communicate over open networks and use the OSI services provided by DECnet-Plus. The interfaces are provided under the Extended Function license and include: o An interface to FTAM (File Transfer, Access, and Management) o Interfaces to the ACSE (Association Control Service Element) and Presentation layers o An interface to ROSE (Remote Operations Service Element) 20 o An interface to the OSI Session layer The interfaces permit application writers to use the services of the OSI upper layers in their applications. The APIs allow you to develop applications on DECnet-Plus systems. You must compile and link source code with the APIs. The APIs are required on the development system and the compile/link system. You can run the resulting application on any DECnet-Plus system with the appropriate operating system. The APIs are not required on these target systems. See Appendix C for details on the OSI APIs. Network Virtual Terminal DECnet-Plus supports two upper layer protocols for terminal access: the OSI Virtual Terminal protocol and the DECnet Command Terminal pro- tocol. Virtual Terminal Virtual Terminal (VT) supports the ISO Virtual Terminal Protocol (ISO 9041). This protocol allows remote logins and access to remote appli- cations between DECnet-Plus for OpenVMS systems and any remote sys- tem, including multivendor systems, that also run an ISO-compliant Vir- tual Terminal implementation. Virtual Terminal is implemented as an Application Service Element (ASE) of the OSI Application layer. Virtual Terminal may act as the terminal/initiator (for a local user) or as the host/responder (for the remote user). A full description of Virtual Terminal features is provided in Appendix B of this SPD. Command Terminal The DCL command SET HOST allows a terminal user on one DECnet-Plus for OpenVMS node to establish a logical connection to another DECnet-Plus node that uses the Command Terminal (CTERM) protocol. This connection 21 makes the terminal appear to be physically connected to the remote sys- tem and the operator can use all the standard system and network util- ities supported by that remote node. This capability is particularly useful for doing remote program development and allows the terminal users on smaller application-oriented systems to use the resources of larger development-oriented systems. Other interfaces are included in DECnet-Plus for OpenVMS. You can de- velop programs and procedures based on these interfaces for functions such as file access and task-to-task communications on individual sys- tems. Because the DECnet-Plus for OpenVMS interfaces stay the same, you can use the programs and procedures developed on an individual sys- tem in a network environment without modifying them. Services Downline Loading Compaq DECnet-Plus for OpenVMS allows for the loading of an unattended system using the services provided by the Maintenance Operations Mod- ule (MOM). MOM provides a set of maintenance operations over various types of circuits by using the Maintenance Operations Protocol (MOP). A loadable system is a system that has a load device enabled for MOP service functions and for which a properly formatted load file is sup- plied. Downline loading involves transferring a copy of the load file image to a remote target node. Load requests can come from the local DECnet-Plus for OpenVMS operator or from the target node. Downline load- ing is supported for Compaq server products. However, this facility is not supported over asynchronous DECnet-Plus for OpenVMS VAX con- nections. Downline Task Loading Initial task images for loadable systems can be stored on OpenVMS file system devices and loaded into remote nodes. Programs already execut- ing on loadable systems can be checkpointed to the host OpenVMS file system and later restored to main memory in the node. These features simplify the operation of network systems that do not have mass stor- age devices. 22 Downline task loading is not supported over asynchronous DECnet-Plus for OpenVMS VAX connections. Upline Dumping Memory images of adjacent nodes connected by Compaq DECnet-Plus for OpenVMS can be written or dumped into a file on an OpenVMS system. This facility provides assistance in troubleshooting in the event of a sys- tem crash. This facility is also supported for Compaq server products. This facility is not supported over asynchronous DECnet-Plus for Open- VMS VAX connections. Mail The OpenVMS Mail utility allows transmission of text messages between users on systems supporting MAIL-11. The Compaq DECnet-Plus for Open- VMS software allows users to exchange mail with users of other DECnet- Plus systems. Phone The OpenVMS Phone utility allows users to send and receive data in- teractively from one user's terminal to another user's terminal. DECnet- Plus allows users on different systems in the same DECnet-Plus net- work to exchange information. OpenVMS Cluster Alias Compaq DECnet-Plus for OpenVMS supports the ability to access nodes in an OpenVMS Cluster using a separate alias node address, while re- taining the ability to address each node in the cluster individually. Not all network objects can be accessed using this mechanism. The max- imum number of nodes supported for a cluster alias is 94. Refer to the OpenVMS Cluster SPD (29.78.xx) for relevant restrictions. DECnet-Plus no longer requires a cluster member to be configured as a router. Clusters in a DECnet-Plus environment require a reachable IS-IS compliant router on the LAN. Network Management 23 Network management is provided with the Network Control Language (NCL). Network management implements the DECnet-Plus layered model, based on the Compaq hierarchical structure called Enterprise Management Archi- tecture (EMA). Users can access NCL through either a command line interface or a graph- ical user interface (GUI) called net$mgmt. The GUI allows network man- agers to view the status of network components and control those com- ponents from a Motif-based window interface. The Compaq DECnet-Plus for OpenVMS network management software allows system and network managers to: o Control and monitor the operation of a network and provide infor- mation related to network traffic and performance o Configure network operating parameters o Start up and shut down network components as needed o Detect and isolate network problems, and return the network to ser- vice once repaired. In addition, the network management software can provide information, warning network managers of faulty or failing network components, both hardware and software. Network Command Language (NCL) is provided as a utility to the net- work manager to perform the operations described above. Network managers can also use NCL to test specific components of the network. NCL enables transmission and reception of test messages ei- ther between systems or through controller loopback arrangements. The messages can then be compared for possible errors. NCL helps users iso- late network problems. Compaq DECnet-Plus for OpenVMS provides network event logging to a ter- minal device, disk file, or remote system. NCL users can enable and disable the event logging facility as well as optionally filter spe- cific events. 24 NCL uses the DNA Common Management Information Protocol (CMIP), which permits entity management from a single location anywhere in the DECnet- Plus network. The Common Trace Facility (CTF) allows the network manager to collect and display information about specific protocol exchanges between sys- tems. Compaq DECnet-Plus for OpenVMS supports an ISO CMISE application pro- gramming interface (API) conforming to the service definitions in ISO 9595. The API allows for development of applications that can commu- nicate with other management applications conforming to ISO 9595 on remote nodes in the network. DECnet-Plus supports the DECnet Phase IV NCP for remote management of Phase IV DECnet systems. Name Service Options Compaq DECnet-Plus for OpenVMS allows the use of one or more naming services. The available services are DECdns, DNS/BIND, and the Local namespace. Node name and addressing information is stored in the na- tive name service; TCP/IP information is maintained in DNS/BIND, and DECnet and OSI information is maintained in DECdns or the Local names- pace. When you use more than one name service, a configurable search list defines the order in which the existing services are to be accessed. Local Namespace Using the Local namespace, you can define up to 100,000 nodes in a lo- cal naming database. A migration tool is available to move the Phase IV database to the new large local file format and/or DECdns format. DNS/BIND DECnet can now use TCP/IP naming and addressing information from the DNS/BIND name service. DECdns 25 Compaq DECnet-Plus for OpenVMS provides a global naming service called the DIGITAL Distributed Naming Service (DECdns). The full DECdns service provides a consistent, network-wide set of names for network resources called the namespace. This namespace is main- tained by one or more DECdns server systems. Compaq recommends that DECdns servers be installed on at least two systems in every LAN. This should provide adequate service and redundancy. The features provided by DECdns include: o A networkwide name-to-attribute mapping service that allows selected Compaq applications to create, read, modify, and delete names in the namespace o A hierarchical structure permitting a large number of names to be stored and distributed across the network o Access control to each name in the namespace o Management and event logging Distributed Time Service Compaq DECnet-Plus for OpenVMS provides a network time service with DECdts, the DIGITAL Distributed Time Service. DECdts provides precise, fault-tolerant clock synchronization for systems in a LAN or WAN. Time is provided in Coordinated Universal Time (UTC) and can be used across a global network. Several forms of time providers are supported, and a callable interface for applications allows users to add their own time providers. DECdts can be used by distributed applications to de- termine event sequencing, duration, and scheduling. Operation DECnet-Plus is implemented under OpenVMS as an ancillary control pro- cess (ACP) and a network device driver with Compaq-supplied executive- level components and user-level programs. 26 The normal OpenVMS protection has been incorporated in the operation of DECnet-Plus. For example, incoming connects, including file access and file transfer requests, are protected by the normal OpenVMS lo- gin and file protection mechanisms. Outgoing connects, including file access and file transfer requests, can include user password infor- mation that is implicitly specified by NCL, or explicitly specified by the user for verification on the remote node. Configuration and Performance You can configure DECnet-Plus using either the BASIC or ADVANCED con- figuration options. Cluster nodes are configurable from any node within the cluster. As with any network protocol, the performance of a given DECnet-Plus for OpenVMS node is a function not only of the expected network traf- fic and resultant processing, but also of the amount of concurrent pro- cessing specific to that node. Thus, node performance depends on many factors including: o CPU type o Number and type of devices attached to the particular CPU o Number of device interrupts per unit time o Communications line(s) characteristics o Number and size of buffers o Message size and frequency of transmission o Applications in use It is important to note that the rate at which user data can be trans- mitted (throughput) over a communications line can sometimes approach, but will never exceed, the actual line speed. This is because the ac- tual throughput is a function of many factors, including the line qual- ity, protocol overhead, topology, and network application(s), as well as the factors cited in this section. 27 The performance of DECnet-Plus is comparable to the performance of DEC- net Phase IV. Standards Conformance Compaq DECnet-Plus for OpenVMS has been designed and implemented to conform to the following standards: o ISO - 4335 - 7776, 7809 - 8073, 8208, 8327, 8473, 8571, 8650, 8802-2, 8802-3, 8823, 8878, 8881 - 9314, 9542, 9041 - 3309 o EN 41 204, 41 205, 41 206, 41 207 o CCITT Recommendation X.25 (1978, 1980, or 1984) using the LAPB or LAPBE variants of the X.25 packet level and data link protocols o U.S. GOSIP V2.0 o U.K. GOSIP V4.0 Contact your local Compaq office for the most recent conformance cer- tificates. Documentation The documentation for Compaq DECnet-Plus for OpenVMS VAX is supplied as follows: o Online versions of the documentation are shipped as part of the Open- VMS Online Documentation Library on CD-ROM, and on the OpenVMS lay- ered product CD-ROM. 28 o Printed copies of the documentation are shipped with TK50 and mag- tape H-kits. o New features are documented extensively in the Release Notes. Installation DECnet-Plus software is customer installable. Installation services are available for customers who request installation of the software product by an experienced Compaq software specialist. Compaq requires that a customer's first use of X.25 include Compaq In- stallation Services. These services provide for installation of the software product by an experienced Compaq software specialist. Customer Responsibilities Before Compaq Services can install the software, the customer must: o Ensure that the system meets the minimum hardware and software re- quirements (as specified in the relevant SPDs) o Prior to installing Compaq hardware or software, obtain, install, and demonstrate as operational any modems and other necessary cus- tomer equipment or facilities to which Compaq's communications hard- ware or software will connect o Designate one adjacent node to verify installation and connectiv- ity o Make available for a reasonable period of time, as mutually agreed upon by Compaq and the customer, all hardware communications fa- cilities and terminals that are to be used during installation. Delays caused by any failure to meet these responsibilities will be charged at the prevailing rate for time and materials. Installation of Compaq DECnet-Plus for OpenVMS consists of the fol- lowing tasks: o Verify that all components of Compaq DECnet-Plus for OpenVMS have been received. 29 o Verify that the necessary versions of the OpenVMS software and doc- umentation are available. o Verify the appropriate SYSGEN parameters. Note: If a software specialist is required to modify the previously installed operating system parameters, a time and materials charge will apply. o Create any necessary Compaq DECnet-Plus for OpenVMS accounts and directories. o Enable software by registering the License Product Authorization Key (PAK) . o Install the Compaq DECnet-Plus software on the target system us- ing the POLYCENTER Software Installation utility . o Verify the proper installation of Compaq DECnet-Plus for OpenVMS by running a series of tests to show connectivity to a designated node. Connectivity to all other nodes within the network is the responsi- bility of the customer. Compaq recommends the use of NCL to help ver- ify connectivity. In some cases, the PSDN supplier (or PTT) may impose restrictions, lim- itations, or requirements on the proposed Compaq network configura- tion. The customer must understand and adhere to these controls for every network. For installation of the X.25 software, the customer must: o Demonstrate equivalence of operation for modems other than Bell 208A, 208B, 209, 212A synchronous modems, or in Europe, PTT approved modems. o Subscribe to the open user group and to at least two switched vir- tual circuits (SVCs) to complete the product's installation check- out (this test loops information from the X.25 native system to the PSDN and back to X.25 native system). Systems that use permanent virtual circuits (PVCs) or closed user groups only, or where the 30 PSDN does not support calls to the same DTE address, require spe- cially negotiated arrangements for Compaq installation of the prod- uct. Hardware Requirements Refer to the OpenVMS Operating System for Alpha and VAX Software Prod- uct Description (SPD 25.01.xx) for hardware requirements and proces- sor support. For general device or controller descriptions, refer to the Network- ing Buyer's Guide. Disk Space Requirements (Block Cluster Size = 1) The following counts refer to the disk space required on the system disk. The sizes are approximate; actual sizes may vary depending on the user's system environment, configuration, and software options. For OpenVMS VAX Systems Disk space required for installation of base software: 85,000 blocks Disk space required for installation of all optional software: 115,000 blocks For WAN Device Drivers Disk space required for installation: 5,000 blocks (2.5 MB) The disk space required for permanent use depends on the number and type of drivers installed, but should not exceed the space required for installation. For X.25 Software Disk space required for installation: 8,000 blocks (4 MB) Disk space required for use (permanent): 10,000 blocks (5 MB) 31 These counts refer to the disk space required on the system disk. The sizes are approximate; actual sizes may vary depending on the user's system environment, configuration, and software options. Supported LAN Adapters Refer to the OpenVMS Operating System for Alpha and VAX Software Prod- uct Description (SPD 25.01.xx) for a list of supported LAN adapters. Cluster Environment The WAN device drivers are fully supported when installed on any valid and licensed OpenVMS Cluster configuration. A device driver can only be accessed from the system or node containing the communications de- vice. On common disks, to configure some product-specific attributes that must remain unique to each system, certain components of the product are stored in the system-specific environment (SYS$SPECIFIC: [SYSxxx]) of the VAX computer on which the installation is being performed. The remaining components of the product, including some or all of the ex- ecutable images, are installed common to all accessing VAX systems. Though some or all of the product's executable images exist in the com- mon system directory (SYS$COMMON: [SYS$LDR]) and are executable by all VAX computers sharing this directory, it is essential that the prod- uct be installed separately on all OpenVMS Cluster systems requiring access to configure the product uniquely for each. The same version of WAN device drivers must be used on all systems in OpenVMS Cluster systems accessing a common disk and in local area Open- VMS Cluster configurations. Communications Devices One of the communications devices listed in Table 2 is required for use with X.25 native and WANDD. 32 ___________________________________________________________________ Table_2:_Synchronous_Communications_Devices________________________ Busless Q-bus VAXBI VAXft Systems____Systems_____Systems_____Systems_____UNIBUS_Systems______ DSH32 DPV11 DMB32 DSF32 DMF32 DST32 DSV11 DSB32 DUP11 DSW43 DSW42 DSW41 DSW21______________________________________________________________ Refer to Table 3 for line speeds for supported protocols. o The DSH32 (dual synchronous line) and the DST32 (single synchronous line) are multifunction devices for busless systems. The communi- cations controllers support DMA transfers for bit-oriented proto- cols and perform character transmission, reception, and framing in microcode. o The DSW21 and DSW41 (single line) and the DSW42 (dual line) are high- performance synchronous communications controllers for busless MicroVAX 3100 and VAXstation 4000 systems. The communications controllers support DMA transfers for bit- and character-oriented protocols. The communications controller performs character transmission, re- ception, and framing in microcode. o The DPV11-DA or the DPV11-S (Q-bus) and DUP11 (UNIBUS) are char- acter interrupt devices for data link handling. CPU cycles are re- quired for data link level protocol processing and for each char- acter sent and received. o The DSV11 is a dual-line synchronous communications device for all Q-bus systems. The DSV11 supports DMA transfers for bit- and character- oriented protocols. The communications controller performs char- acter transmission, reception, and framing in microcode. 33 o The DSF32 (MI-bus) is a multifunction device for VAXft fault tol- erant systems. The DSF32 provides a dual-line synchronous capabil- ity and supports DMA transfers for bit- and character-oriented pro- tocols. The communications controller performs character transmis- sion, reception, and framing in microcode. You can use the two lines independently to run different protocols or to provide a failover capability between lines in the event of an application or system failure. o The DMB32 (BI-bus) and the DMF32 (UNIBUS) are multifunction devices that include a single DMA line. The communications controllers per- form character transmission, reception, and framing in microcode. o The DSB32 (BI-bus) is a dual-line synchronous communications de- vice for VAXBI systems. The DSB32 supports DMA transfers for bit- and character-oriented protocols. The communications controller performs character transmission, reception, and framing in microcode. Notes: o The DSH32 and DST32 are not supported on VAXstation 2000 and VAXs- tation 3100 systems. o The DSB32 is not supported for use on the VAX 7000 or VAX 10000 sys- tems. o The DSB32 is not supported for use on a VAX 6600 with extended ad- dressing (>512 MB of physical memory) enabled. o The DMB32, DMF32, and DSH32 are multifunction devices. Only the de- vice driver for the synchronous ports are included in the DECnet- Plus kit. o The DMB32 must be revision J or later for applications using GEN- BYTE, HDLC, or SDLC protocols. o The DMF32 must be revision J of later for applications using HDLC protocol and revision M is required for simultaneous operation of the printer port. 34 o The DMB32 only supports a synchronous line speed of 19.2 Kb/s if any asynchronous lines are in use. The DMB32 is also supported on VAX 7000 and VAX 10000 systems configured with extended address- ing, (32-bit physical addresses). o The DMF32 is supported on a VAXBI system fitted with a DWBUA UNIBUS adapter for DDCMP and GENBYTE protocol use only. o The DSH32 running the DDCMP protocol only supports a single line at 9.6 Kb/s on a MicroVAX 2000. Running the BISYNC protocol, it only supports a single line at 4.8 Kb/s on a MicroVAX 2000. o The DSV11, DSW42, and the DSB32 support the use of different pro- tocols on each of the two lines of the device. o The DUP11 is supported on a VAXBI system fitted with a DWBUA UNIBUS adapter for VAX 8200, VAX 8250, VAX 8300, VAX 8300, VAX 8350, VAX 8500, VAX 8530, VAX 8550, VAX 8700, and VAX 8800 systems only. All the WAN device drivers included with DECnet-Plus offer support for a user ($QIO) interface. Table 3 lists the device driver character- istics and indicates the maximum permitted line speeds for each of the line protocols supported by the individual drivers. ___________________________________________________________________ Table_3:_Synchronous_Device_Driver_Characteristics_________________ Maximum Line Speed for Supported Protocols (Kb/s) Device___Code_____DDCMP____HDLC_____SDLC___________________________ DMB32 SI 19.2 38.4 38.4 DSB32 SL 64/64 192 192/64 /64 DSV11 SJ 256 256 256/64 /64 /64 DMF32 XG 19.2 19.2 19.2 DPV11 SE 9.6 9.6 9.6 35 ___________________________________________________________________ Maximum Line Speed for Supported Protocols (Kb/s) Device___Code_____DDCMP____HDLC_____SDLC___________________________ DSH32 ZS 19.2 19.2 19.2 /9.6 /9.6 /9.6 DST32 ZS 9.6 19.2 19.2 DUP11 SE 4.8 9.6 9.6 DSF32 SF/SM 64/64 64/64 64/64 DSW43 ZT 256 256 256/64 /64 /64 DSW42 ZT 256 256 256/64 /64 /64 DSW41 ZT 256 256 256 DSW21____ZT_______256______256______256____________________________ Note: Where two line speeds are shown, for example 256/64, the higher speed refers to single line operation of the device while the lower speed refers to dual line operation of the device. The WAN device drivers included with DECnet-Plus also provide a pseu- dodriver (WANDRIVER) that provides a programming interface to the data link level for the LAPB, DEC-HDLC, and DDCMP protocols. The device drivers all support full-duplex and half-duplex operation, where appropriate to the protocol. DDCMP and SDLC device drivers sup- port both point-to-point and multipoint tributary operation. "BISYNC" refers to the IBM implementation of bisynchronous protocol. The GEN- BYTE protocol is a general byte-oriented protocol for use with user- written framing routines, is supported by the DMB32 and the DMF32 de- vice drivers. 36 The maximum permitted line speed depends on the line interface stan- dard used and must not exceed 19.2 Kb/s for an RS232 V.24 interface. There may be additional line speed restrictions for other line inter- face standards. Refer to the Software Product Descriptions for the syn- chronous interfaces for more information. Other Compaq communications layered products may not necessarily sup- port operation of the synchronous interface at the maximum line speed supported by the device driver. Refer to the appropriate Software Prod- uct Description for the Compaq communications layered product for pre- cise details of supported configurations. In all cases, throughput over synchronous lines is dependent on the user application and system environment. The WAN device drivers all support modem control signal operation. Re- fer to the Software Product Descriptions for the appropriate synchronous interface for details of the modem signals supported by an individ- ual interface. Optional Hardware Additional communications device(s) subject to the limitations described in Table 3 of this SPD are required. Supported Public Networks Table 4 describes public PSDNs that are supported with the X.25 soft- ware only in the countries shown. In addition to these public PSDNs, certain private PSDNs have been tested by Cpompaq and appropriate pro- files are included in the X.25 software. Since the publication of this SPD, other configurations may have been tested. Consult your local Compaq office for any questions concern- ing other public PSDNs. Compaq has designed or adopted the X.25 soft- ware to operate with equipment conforming to ISO 8208/7776, with cer- tain private PSDNs that have been approved by Compaq, and with pub- lic networks in Table 4. Profiles for these private and public PSDNs are included in X.25. Connections to public networks not shown in this table are not supported by Compaq. 37 The presence of a network/country combination in Table 4 shows Com- paq's commitment to support the X.25 software when using that public X.25 service. It does not necessarily imply that network certifica- tion by the particular networking authority has been granted for all or any hardware devices supported by the X.25 software. Contact your local Compaq office for up-to-date information regarding supported con- figurations and certification status. Compaq has designed or adapted the X.25 software to operate with equip- ment conforming to ISO 7776/8208 with the public networks in the coun- tries listed below and with certain private PSDNs that have been ap- proved by Compaq. ___________________________________________________________________ Table_4:_Supported_Public_Networks_________________________________ Country_________________Public_Network_and_CCITT_revision(s)_______ Argentina Arpac Australia Austpac Austria Datex-P Belgium DCS Brazil Renpac Canada Datapac (1976, 1980) DPN-NAS Faspac Infoswitch Chile VTRNET China CNPAC Denmark Datapak Ireland Eirpac (1980,1984) Postgem Finland Datapak France Transpac Germany Datex-P 38 ___________________________________________________________________ Country_________________Public_Network_and_CCITT_revision(s)_______ Hong Kong Datapak GDN INET Intelpak Indonesia SKDP Italy Itapac Japan DDX (1976, 1980, 1984) ACE Telenet CCVAN INS-P Jaisnet Venus-P (1980) Venus-LP Tymnet Luxembourg LUXPAC Malaysia Maypac Mexico Telepac Netherlands Datanet 1 New Zealand Pacnet Norway Datapak Pakistan Paknet Philippines Datanet Portugal Telepac Singapore Telepac South Korea Dacomnet Spain Iberpac Sweden Datapak Switzerland Telepac (1978, 1980) Taiwan Pacnet 39 ___________________________________________________________________ Country_________________Public_Network_and_CCITT_revision(s)_______ Thailand Samart Thaipak Turkey Turpac United Kingdom PSS United States Accunet Autonet Bell Atlantic Compuserve ConnNet Digipac Fedexitc Graphnet IMPACS Infonet MarkNet Extended Service PPSNET Pulselink Sinet Telenet Tymnet Western Union PTN-1 ________________________Worldnet___________________________________ Note: Compaq offices in Japan can supply the mandatory additional in- formation that explains the special use of X.25 with the DDX PSDN. Unless otherwise acknowledged within the product documentation, the trademarks under which the services are offered are proprietary to the respective national PTT, the owning or operating companies, or equiv- alent organization. X.25 Software Configuration Guidelines 40 Table 5 describes the physical hardware configurations supported by X.25 in terms of CPU type and communication interface. It is assumed that there are 128 bytes of user data per packet in an X.25 native mode configuration where data is being sent and received at maximum speeds in both directions. This table indicates the maximum load for certain VAX processors supported at the time of publication. The numbers given in the table are load costs. Load costs indicate the overhead of full-duplex packet transfer at the indicated speed. The load units are calculated for an application that does no work with transmitted/received data, and indicate a maximum packet rate for that configuration. An idle device incurs negligible load. Systems should be configured to sustain peak load rates. ___________________________________________________________________ Table_5:_CPUs,_Maximum_Load_and_Supported_Devices__________________ Maximum Load in Supported CPU_____________________load_units____Device(s)____________________ MicroVAX II 160 DSV11, DPV11-DA MicroVAX 2000 100 DSH32, DST32 MicroVAX 3100 350 DSH32 MicroVAX 3100 Model 440 DSW41, 30/40 DSW42 MicroVAX 3100 Model 1000 DSW41, 80 DSW42 MicroVAX 3100 Model 2100 DSW41, 90 DSW42 MicroVAX 3300/3400 210 DSV11, DPV11-S 41 ___________________________________________________________________ Maximum Load in Supported CPU_____________________load_units____Device(s)____________________ MicroVAX 3500/3600 330 DSV11, DPV11-S MicroVAX 3800/3900 390 DSV11, DPV11-S VAXft Model 310 320 DSF32 VAXserver 3100 290 DSH32 VAXserver 6000 Model 210 DMB32, 210 DSB32 VAXserver 6000 Model DSB32 VAXserver 6000 Model 300 DMB32, 400 Series DSB32 VAX-11/730 40 DMF32, DUP11 VAX-11/750 70 DMF32, DUP11 VAX-11/780 120 DMF32, DUP11 VAX-11/785 180 DMF32, DUP11 VAX 8600 400 DMF32, DUP11 VAX 8650 500 DMF32, DUP11 VAX 4000 Model 300 580 DSV11, DPV11-S VAX 6000 Model 200 250 DMB32, Series DSB32 42 ___________________________________________________________________ Maximum Load in Supported CPU_____________________load_units____Device(s)____________________ VAX 6000 Model 300 350 DMB32, Series DSB32 VAX 6000 Model 400 450 DMB32, Series DSB32 VAX 8200/8300 100 DMB32, DSB32 VAX 8250/8350 125 DMB32, DSB32 VAX 8500 360 DMB32, DSB32 VAX 8530 450 DMB32, DSB32 VAX 8550 550 DMB32, DSB32 VAX 8700 700 DMB32, DSB32 VAX 8800/8810/882/ 700 DMB32, 8830/8840 DSB32 VAX 8842 700 DMB32, DSB32 VAX 8978 700 DMB32, ______________________________________DSB32________________________ Factors to Consider Other factors to consider when configuring hardware devices for use with X.25 on a given processor are: 43 o Hardware configuration limits, such as power supply, backplane space, bus throughput and mapping registers available, and any other re- strictions on the number of devices per CPU or per bus must be ob- served. o Actual/average packet size in bytes - Generally, doubling the ac- tual packet size will halve the load units consumed for direct mem- ory access (DMA) devices, but increase the load units for character- interrupt devices by approximately 30 percent. o Table 5 assumes that data is sent and received in each direction of a full-duplex line in equal ratio. If the number of X.25 pack- ets per second is predominantly one-way, the load units per line can be reduced proportionately up to a factor of 50 percent. The maximum system configuration with a mix of device types is com- puted by adding the load costs (in load units) for each device up to the limit for a given processor type. Table 6 lists the load units for devices at various speeds. ___________________________________________________________________ Table_6:_Load_Units_per_Line_at_Various_Speeds_____________________ Load Units used at Speed (Kb/s) Device # of Max. Type________Lines___Speed___4.8____9.6____19.2___48_____64_________ DMB32 1 64.0 9 18 36 n n/s /s[1] DSB32 2 64.0 9 18 36 90 120 or 1 192.0 DMF32 1 19.2 9 18 36 n/s n/s ___________________________________________________________________ [1]n/s indicates that the use of the device at this speed is not supported by x.25. 44 ___________________________________________________________________ Load Units used at Speed (Kb/s) Device # of Max. Type________Lines___Speed___4.8____9.6____19.2___48_____64_________ DPV11- 1 9.6 23 64 n/s n/s n/s DA[2] DPV11-S DST32 1 19.2 10 20 40 n/s n/s DSH32 1 19.2 10 20 40 n/s n/s DUP11[2] 1 9.6 23 46 n/s n/s n/s DSV11 2 64.0 9 18 36 90 120 or 1 256.0 DSW21 1 256.0 9 18 36 90 120 DSW41 DSW42 2 64.0 9 18 36 90 120 DSW43 or 1 256.0 DSF32 2 64.0 9 18 36 90 120 ___________________________________________________________________ [2]For more than one character interrupt device, multiply the load units by 50 percent to allow for interaction between devices. ___________________________________________________________________ Example 1: A VAX 8500 computer is being used to process X.25 native mode commu- nications. If the system uses one line of a DSB32 at 192 Kb/s and a DMB32 at 19.2 Kb/s, the load unit total is 156. Assuming these devices are fully active, they will consume 156/360 = 43% of the CPU for com- munications processing. It is inadvisable to add more devices to this CPU, unless it is dedicated to the task of communications processing. Example 2: When one line of a DSV11 is fully used on a MicroVAX 3800 at 64 Kb/s, it consumes 120/390 = 31% of the processor in processing X.25 commu- nications. 45 Certain versions of these products depend on a specific version of the operating system. Refer to the Software Product Descriptions of the product in question to determine which version is required. Software Requirements Compaq DECnet-Plus for OpenVMS VAX requires OpenVMS operating system Version 7.2 or 7.2-1. OpenVMS Tailoring The following OpenVMS classes are required for full functionality of this layered product: OpenVMS Required Save Set Network Support Programming Support For more information, refer to the OpenVMS Operating System for Al- pha and VAX Software Product Description (SPD 25.01.xx). OpenVMS classes and tailoring are discussed in the OpenVMS VAX installation manual. Optional Software TCP/IP A separate TCP/IP protocol stack is required to use the DECnet over TCP/IP features in DECnet-Plus. The following TCP/IP products have been tested with DECnet-Plus: o DIGITAL TCP/IP Services for OpenVMS Version 5.0 and 5.0A DIGITAL TCP/IP Client Software License: QL-GL7A*-** DIGITAL TCP/IP Services Software License: QL-VHRA*-** DIGITAL TCP/IP Client Upgrade License: QL-0PHA*-** SPD: 46.46.xx o Process Software Corporation: TCPware; Multinet X.25 Optional License 46 An X.25 license is required when using X.25 and the LAPB protocol over the WAN. This license is not required when using X.25 and the LLC2 pro- tocol on the LAN. Software License: QL-071A*-AA Media and Documentation: Included in Compaq DECnet-Plus for OpenVMS VAX media and documentation kits. Growth Considerations The minimum hardware/software requirements for any future version of this product may be different from the requirements for the current version. Distribution Media This product is available as part of the OpenVMS Consolidated Soft- ware Distribution on CD-ROM. The software documentation for this prod- uct is also available as part of the OpenVMS Online Documentation Li- brary on CD-ROM. Compaq DECnet-Plus for OpenVMS VAX is also available on TK50 stream- ing tape and 9-track 1600-bit/in magtape for a limited time. Support for H-Kits on this traditional media are being phased out in favor of the CD-ROM distribution. Ordering Information In the following table, asterisks (*) denote variant fields. For ad- ditional information on available licenses, services, and media re- fer to the appropriate price book. Software Li- QL-D04A*-AA censes: End System 47 QL-D05A*-AA Extended Function OpenVMS VAX QA-VWJ8A-A8 CD-ROM Distribu- tion: Software Media: QA-D04AA-H*(*) Software Documen- QA-D04AA-GZ (Documentation Set) tation: Consolidated QT-VWJ8A-*8 Distribution Service: Software Product QT-D04A*-** Services: Software Licensing The DECnet-Plus licenses give users the right to use the software on a single CPU and include the delivery of a License Product Authoriza- tion Key (PAK) to enable the DECnet-Plus for OpenVMS software. The End System license grants the right to use all the DECnet-Plus fea- tures with the exception of the DECdns Server, cluster alias, the OSI application programming interface, the OSI applications gateways, and routing. The Extended Function license grants the right to use the DECnet-Plus end-system features, the DECdns Server, OSI application gateways, OSI application programming interfaces, host-based routing, and the clus- ter alias. An Extended Function license is required on at least one node in every cluster configuration to enable the use of the cluster alias. This software is furnished under a license only. For more information about Compaq's licensing terms and policies, contact your local Com- paq office. License Management Facility Support 48 This product supports the OpenVMS VAX License Management Facility. License units for this product are allocated on a CPU basis. For more information on the License Management Facility, refer to the OpenVMS Operating System for Alpha and VAX Software Product Descrip- tion (SPD 25.01.xx) or the License Management Facility manual of the OpenVMS VAX operating system documentation set. For more information about Compaq's licensing terms and policies, con- tact your local Compaq office. Software Product Services Prerequisite Support For the use of X.25 with PSDNs, the customer and Compaq must jointly prepare a Network Profile and Customer Support Plan covering all the intended network nodes, their usage of switched virtual circuits (SVCs), permanent virtual circuits (PVCs), and other network facilities, and their support. Without this Network Profile and Customer Support Plan, Compaq cannot support the network connections. A variety of service options are available from Compaq. For more in- formation, contact your local Compaq office. YEAR 2000 READY This product is Year 2000 Ready. "Year 2000 Ready" products are defined by Compaq as products capable of accurately processing, providing and/or receiving date data from, into and between the twentieth and the twenty-first centuries, and the years 1999 and 2000, including leap year calculations, when used in accordance with the associated Compaq product documentation and pro- vided that all hardware, firmware, and software used in combination with such Compaq products properly exchange accurate date data with the Compaq products. 49 For additional information visit Compaq's DIGITAL Products Year 2000 Ready website located at http://ww1.digital.com/year2000/status.asp. To ensure that this product is Year 2000 Ready, the following test- ing process/methods were utilized: o Source code was examined manually and with Y2K compliance tools. o Interfaces were tested during a rollover to year 2000. Software Warranty This software is provided by Compaq with a 90 day comformance warranty in accordance with the Compaq warranty terms applicable to the license purchase. Appendix A: File Transfer, Access, and Management (FTAM) FTAM software provides communications for the following file opera- tions between open systems: o Copying files between local and remote systems o Appending, deleting, or renaming files o Displaying information about files An open system is a computer system that implements the standards for each of the seven layers of the Open Systems Interconnection (OSI) Ref- erence Model for communications as defined by the International Or- ganization for Standardization. An FTAM system is any open system con- taining an FTAM implementation that conforms to the FTAM standard and includes the implementations of the necessary underlying OSI services. FTAM implements several standards that define the following components of these layers of the OSI Basic Reference Model: the FTAM service el- ement and the Association Control Service Element (ACSE) of the Ap- plication layer, the Presentation layer, and the Session layer. 50 Supported Standards FTAM conforms to the following OSI standards: o ISO 8571 - File Transfer, Access, and Management service and pro- tocol o ISO 8650 - ACSE protocol o ISO 8823 - Presentation protocol o ISO 8327 - Session protocol Table 7 compares the supported implementation profiles for different standards bodies and their relationship to each other. ___________________________________________________________________ Table_7:_Standards_and_Implementation______________________________ International Standardized Profiles (ISP) ISO_10607_________NIST________CEN/CENELEC_and_EWOS_________________ Part 1: Spec- - - ification of ACSE, Pre- sentation and Session proto- cols for use by FTAM Part 2: Def- - - inition of document types, con- straint sets, and syntaxes 51 ___________________________________________________________________ International Standardized Profiles (ISP) ISO_10607_________NIST________CEN/CENELEC_and_EWOS_________________ Part 3: AFT11 T1 - A/111 - - Simple Simple iENV 41 204 File Trans- File fer Service Transfer (Unstructured) Part 4: AFT12 T2 - Po- A/112 - (DISP)[1] - sitional ENV 41 206 Positional File File Trans- Transfer fer Service (Flat)[2] Part 5: AFT3 M1 - A/13 - (DISP)[1] - Manage- ENV 41 205 File Manage- ment ment Service ___________________________________________________________________ [1]Draft ISP [2]AFT12 is not supported by DECnet-Plus ___________________________________________________________________ FTAM Component Software The component software includes the user facilities (initiators), re- sponders, management tools, and problem determination tools. FTAM User Facilities Users access the FTAM user facilities by entering the following Open- VMS operating system commands: APPEND, COPY, DIRECTORY, RENAME, and DELETE. These commands operate on files stored on any FTAM system whose implementations are compatible with FTAM. You cannot use these com- mands to manipulate files directly on your local system. 52 Support for Any File-Naming Convention A file designation is system-specific information that identifies a file to its storage system. FTAM software lets users specify files us- ing the naming conventions of the systems where the files reside. FTAM supports the OpenVMS operating system RMS format for file specifica- tions and a comparable style of file-specification format that accom- modates non-RMS file designations. Support for Several File Types FTAM software can access and transfer files containing both binary and ASCII data. FTAM-1, FTAM-2, FTAM-3, and NBS-9 document types are sup- ported. FTAM-1 files are unstructured text files, FTAM-2 files are sequential text files, and FTAM-3 files are unstructured binary files. Table 8 shows the parameters supported by FTAM-1, FTAM-2, and FTAM-3 document types. ___________________________________________________________________ Table_8:_FTAM_Document_Types_______________________________________ String Document Signifi- Universal Type______cance_______Class_______Maximum_String_Length____________ FTAM-1 Not IA5String Presence and absence of parame- significant ter GeneralString Fixed VisibleStrinPresence of parameter GraphicString Variable VisibleStrinPresence and absence of parame- ter GraphicString 53 ___________________________________________________________________ String Document Signifi- Universal Type______cance_______Class_______Maximum_String_Length____________ FTAM-2 Not VisibleStrinPresence or absence of parameter significant GraphicString FTAM-3 Not Presence or absence of parameter significant __________Fixed___________________Presence_of_parameter____________ NBS-9 files are NBS file directories. Flexible and Transparent Access for Local Files FTAM software treats local files the same way that the OpenVMS oper- ating system file system treats them. File Transfers The FTAM COPY command transfers files between compatible FTAM systems without modifying the source file. The facility can transfer files in either direction between the local system and a remote FTAM system. The COPY command can also transfer files between two remote FTAM sys- tems for a local FTAM user. The COPY command also allows you to append one or more files to a sin- gle output file within or between FTAM systems. FTAM-DAP Gateway The FTAM-DAP Gateway lets you perform file operations from a non-OSI system that supports the DAP protocol to an OSI system supporting FTAM. Remote users of the gateway need not establish accounts on the gate- way system to use its capabilities. The gateway does not support the APPEND functionality. 54 File Deletion The FTAM DELETE command lets you delete one or more files on any com- bination of FTAM systems provided you have delete access to those files on the specific FTAM system. Renaming Requests The FTAM RENAME command allows you to rename files. The command works on files stored on remote FTAM systems (remote files). The command en- ables you to change the path name or file name of an existing file. For remote files, you must specify whatever type of information the remote FTAM system requires for specifying files. Directory Requests The FTAM DIRECTORY command lets you display the complete set of FTAM file attributes. Specific options allow you to vary the display of at- tributes that are meaningful in an OpenVMS operating system environ- ment, for example, date and time of the last modification of file name. FTAM File Error Recovery FTAM provides file error recovery functionality, both in the COPY ini- tiator command and in the FTAM responder. File error recovery is pro- vided for classes 1, 2, and 3 errors as detailed in ISO 8571-4. Class 1 file error recovery provides only the restart functionality, while classes 2 and 3 provide both the restart and recovery function- ality as follows: o If an internal error is detected in the data transfer regime, class 1 recovery restarts the data transfer regime by retransmitting the file data beginning at the negotiated checkpoint within the data transfer regime. o Class 2 error recovery provides for the re-establishment of the se- lect and open regimes, and also allows for the retransmission of file data beginning at a negotiated checkpoint within the data trans- fer regime. 55 o Class 3 error recovery provides full recovery by re-establishing a lost FTAM association and its select and open regimes. Class 3 recovery then restarts the data transfer regime by retransmitting the file data beginning at the negotiated checkpoint within the data transfer regime. All restart and recovery operations and procedures are completely trans- parent to the user. Management and Problem Determination Tools FTAM software supplies a number of management tools, including an in- stallation verification procedure (IVP), a tracing utility, event log- ging, and informational and error messages. FTAM Installation Verification Procedure (IVP) The FTAM IVP sets up outbound and inbound application associations. A connection is made to your local system (as a loopback test). The FTAM IVP checks that your installation is able to set up and release presentation and session connections. It tests the FTAM software by starting a responder and reading the attributes of a file with the DI- RECTORY command. FTAM Tracing Utility The FTAM tracing utility (OSITRACE) is a tool for identifying prob- lems in protocol exchanges between your local system and any remote FTAM system. The tracing utility captures protocol exchanges and tran- scribes them into easily read text; OSITRACE data is written to SYS$OUTPUT. The FTAM tracing utility monitors data exchanges for individual as- sociations. The tracing utility can trace data originating from the following components: FTAM (DATA, PROTOCOL, and STRUCTURING), ACSE, Presentation, and Session. OSI Address Lookup Using X.500 The FTAM software is capable of retrieving network addresses from the X.500 directory. You can use this functionality with or instead of re- trieving addresses from a local repository. 56 FTAM Event Logging For event logging, the FTAM responder writes records to OSIF$RESPONDER.LOG. Requirements for Compatibility with FTAM FTAM lets an open system perform a specific set of file transfer, ac- cess, and management activities with any open system having a compat- ible FTAM implementation. The Protocol Implementation Conformance Statement (PICS) provides more information about Compaq's FTAM implementation. Appendix B: Virtual Terminal DECnet-Plus Virtual Terminal (VT) is Compaq Computer Corporation's im- plementation of the ISO Virtual Terminal Basic Class standard, which consists of the service definition (ISO 9040) and the protocol (ISO 9041). VT software adheres to these standards, thereby providing in- teractive access between DECnet-Plus systems and other multivendor ter- minal systems and host systems that also adhere to the ISO Virtual Ter- minal Basic Class standard. VT is implemented as an Application Service Element (ASE) of the OSI Application layer. VT can run over Transport layer classes 0, 2 or 4 over CONS, and TP4 over CLNS. VT can also run over TCP/IP networks using RFC 1006. VT provides terminal/initiator (for a local user) and host/responder (for the remote user) capabilities. Terminal/responder and host/initiator are not supported. Supported Standards VT conforms to the following OSI standards: ISO 9041 - Virtual Terminal protocol - basic class ISO 8650 - ACSE protocol ISO 8823 - Presentation protocol 57 ISO 8327 - Session protocol Virtual Terminal Features Virtual Terminal supports the following features: o Basic class (character cell terminals) of service o Asynchronous mode (A-Mode) of operation o Profile Support - Default A-mode (per ISO 9040) - A-mode Generalized Telnet (adheres to OIW Stable Agreements) - A-mode Transparent (adheres to OIW Stable Agreements) - A-mode Telnet 1988 (adheres to OIW Stable Agreements) o Functional Units - destructiveBreak - structuredCOs - urgentData o Supported Gateways - Bidirectional VT/Telnet - Bidirectional VT/LAT o Online Help OSI Address Lookup using X.500 The VT software is capable of retrieving network addresses from the X.500 directory. You can use this functionality with or instead of re- trieving addresses from a local repository. Command Mode Command mode allows you to execute commands that can modify the char- acteristics of the Virtual Terminal association with the remote ap- plication. 58 Trace Utility The VT tracing utility (OSITRACE) is a tool for identifying problems in protocol exchanges between your local system and any remote sys- tem. The utility captures protocol exchanges and transcribes them into easily read text. The tracing utility monitors data exchanges for individual associa- tions. The utility can trace data originating from the VT, ACSE, Pre- sentation, and Session components. Appendix C: OSI Application Programming Interfaces FTAM API The FTAM API supports the OSI standard ISO 8571: Information Process- ing Systems, Open Systems Interconnection, and File Transfer, Access, and Management. The FTAM API provides the interface to the FTAM protocol machine pro- vided in DECnet-Plus. Communications between the application code and the FTAM protocol machine are carried out using ASN.1 encoded data struc- tures. The API supports the following functions: Abort Begin-Group Cancel Change-Attributes Create Close Data Data-End Delete Deselect End-Group Initialize Open Read-Attributes Read 59 Select Terminate Transfer-End Write OSI Application Kernel (OSAK) API The OSAK API provides a direct interface to servcies at the ACSE and Presentation layer. The OSAK API supports the following OSI standards for the ACSE layer: o ISO 8650: Information Processing Systems, Open Systems Intercon- nection, Protocol Specification for the Association Control Ser- vice Element o ISO 8649: Information Processing Systems, Open Systems Intercon- nection, Service Definition for the Association Control Service El- ement The OSAK API provides the interface to the ACSE services. It provides the following services: Associate Release Abort Redirect The redirect service is not an ACSE service. The service allows ap- plications to redirect an incoming association to another process on the local system. The OSAK API also includes support for the OSI Presentation layer with support for the following OSI standards: o ISO 8823: Information Processing Systems, Open Systems Intercon- nection, Connection-Oriented Presentation Protocol Specification o ISO 8822: Information Processing Systems, Open Systems Intercon- nection, Connection-Oriented Presentation Service Definition o ISO 8327: Information Processing Systems, Open Systems Intercon- nection, Basic Connection-Oriented Session Protocol Specification 60 o ISO 8326: Information Processing Systems, Open Systems Intercon- nection, Basic Connection-Oriented Session Service Definition The Presentation layer services supported by the OSAK API are: Alter-Context Data Capability-Data Expedited-Data Typed-Data Token-Please Token-Give Control-Give Sync-Major Sync-Minor Resynchronize Exception-Report Activity-Start Activity-Interrupt Activity-Resume Activity-Discard Activity-End The OSAK API also supports (by pass through) the OSI Session layer ser- vices. Session Layer API The Session layer API, called the OSAK Session Programming Interface (SPI), supports the following OSI standards: o ISO 8327: Information Processing Systems, Open Systems Intercon- nection, Basic Connection Oriented Session Protocol Specification o ISO 8326: Information Processing Systems, Open Systems Intercon- nection, Basic Connection Oriented Session Service Definition. Support for the OSAK SPI interface is limited to Version 3.0. The OSAK Version 1.1 SPI interface is no longer supported. 61 The Session layer supports ISO Session version 1 and version 2. Ses- sion version 1 allows up to 512 octets of user data on a service. Ses- sion version 2 supports the restrictions imposed by the National In- stitute of Standards and Technology allowing up to 10,240 octets of data on a service. Compaq DECnet-Plus for OpenVMS Version 7.2-1 includes Version 3.0 of the OSAK SPI. Users of the OSAK SPI Version 1.1 should upgrade to Ver- sion 3.0. The OSAK API provides the interface to the following connect and re- lease services: Connect Release Abort Redirect The redirect service is not a Session service. The service allows ap- plications to redirect an incoming connection to another process on the local system. The Session layer services supported by the OSAK API are: Data Capability-Data Expedited-Data Typed-Data Token-Please Token-Give Control-Give Sync-Major Sync-Minor Resynchronize Exception-Report Activity-Start Activity-Interrupt Activity-Resume Activity-Discard 62 Activity-End ROSE API The Remote Operations Service Element (ROSE) supports the OSI stan- dard ISO 9072: Information Processing Systems, Text Communication, and Remote Operations. ROSE supports interactive applications in a distributed open systems environment. It is a service for multivendor distributed processing. The ROSE functionality provides a mechanism that allows for encoding and decoding the remote operations protocol control information, as defined in ISO 9072, for the following services: Invoke Result Error Reject The information in this document is valid at the time of release. Please contact your local Compaq office for the most up-to-date information. ©Digital Equipment Corporation 1999 All rights reserved. [R] TCPware is a registered trademark of Process Software Corpo- ration [R] Multinet is a registered trademark of Process Software Corpo- ration [R] IBM is a registered trademark of International Business Ma- chines, Inc. [R] MS-DOS is a registered trademark of Microsoft Corporation. [TM] The Compaq Logo, DDCMP, DECnet, DECnet-DOS, DECnet-VAX, DEC- NIS, DEC WANrouter, DIGITAL, DNA, LAT, MicroVAX, OpenVMS, PDP-11, Q-bus, ULTRIX, UNIBUS, VAX, VAX Fortran, VAX MACRO, VAXBI, VAXft, VMScluster, VAXserver, VAXstation, and XMI are trademarks of Compaq Computer Corporation. 63