Software Product Description ___________________________________________________________________ PRODUCT NAME: Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A DESCRIPTION Compaq SNA Domain Gateway (Domain Gateway) is a member of Compaq's fam- ily of Compaq SNA network transport products. This family consists of hardware and software products that connect suitably configured net- worked systems in a Compaq environment with suitably configured IBM systems in a Systems Network Architecture (SNA) environment. With ap- propriate OpenVMS, Tru64 UNIX, and DECnet-Plus access routines, users can exchange information and share resources between Compaq and IBM networked systems in a bidirectional manner. The Domain Gateway is managed and configured using the management soft- ware that is part of the Domain Gateway product. The Domain Gateway supports TCP/IP and DECnet-Plus network protocols. Networks using these protocols are referred to as the non-SNA networks. The Domain Gateway is part of both the SNA network and the non-SNA net- work. Architecturally, it is a DECnet-Plus and/or TCP/IP end node and an SNA Physical Unit Type 5 (PU T5) node. The Domain Gateway appears to the SNA network as an SNA domain that contains one subarea. The Compaq SNA Domain Gateway software is supported on the DEC Chan- nelServer II hardware platform [DESNB] and the DEC MicroServer hard- ware platform [DEMSA]. When used with the Domain Gateway software, each of these hardware products provides SNA connectivity to any DECnet- Plus or TCP/IP system in the non-SNA network. Note: The DEC ChannelServer II [DESNB] and DEC MicroServer [DEMSA] hard- ware platforms are no longer available from Compaq. However, hardware and software support for these products will continue. For details, please contact your local Compaq representative. April 2001 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A The DEC ChannelServer II hardware unit connects directly to an Eth- ernet local area network (LAN), using a standard Ethernet transceiver cable, and to an IBM S/370 Block Multiplexer channel, using a single set of Bus and Tag connectors. The combination of the Domain Gateway software and the DEC ChannelServer II hardware unit is referred to as a Domain Gateway-CT. The DEC MicroServer hardware unit connects directly to an Ethernet LAN, using a standard Ethernet transceiver cable. The DEC MicroServer hard- ware unit connects to up to four front-end communications controllers (37**-style), using standard synchronous data lines and modems. These front-end processors must all be in the same SNA network. The combi- nation of the Domain Gateway software and the DEC MicroServer hard- ware unit is referred to as a Domain Gateway-ST. This product can be used in networks currently using other Compaq SNA gateways and can share access routines, Ethernet LANs, and load host resources with those systems. The Domain Gateway supports a single physical unit (PU) with its own System Services Control Point (SSCP). The Domain Gateway supports up to 16 explicit routes for each destination subarea in the SNA network, supports IBM Class of Service capability, and allows up to eight vir- tual routes (each of which can have three transmission priority lev- els) for each explicit route. The Domain Gateway-CT supports a sin- gle transmission group (TG). The Domain Gateway-ST supports multiple (up to four) TGs and multilink TGs. The Domain Gateway-CT supports the configuration of up to 1024 log- ical units (LUs), and the Domain Gateway-ST supports up to 128 LUs. All LUs can have multiple sessions. Table 1 shows the maximum number of active LU-LU sessions supported by the two hardware platforms. 2 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A ___________________________________________________________________ Table_1:__Maximum_Sessions_Supported_by_the_Domain_Gateway_________ Hardware_Unit______Maximum_Active_Sessions_________________________ DEC Chan- 1024 nelServer II DEC_MicroServer____32_or_128_(depending_on_software_license)_______ Because the Domain Gateway is a PU T5 implementation, it enables DECnet- Plus or TCP/IP based applications to be either primary logical units (PLUs) or secondary logical units (SLUs) when communicating with IBM applications and peripheral devices. This means that suitably config- ured Compaq based applications can be interactively accessed from IBM SNA networked 3270 devices. Features Common to All Domain Gateways o Implements an SNA PU T5 o Multiple session support for each LU o Supports applications acting as either PLUs or SLUs o Provides access to OpenVMS Alpha, OpenVMS VAX, and Tru64 UNIX ap- plications from SNA 3270 devices o Implements IBM Class of Service support o Supports SNA explicit routes, virtual routes, and transmission pri- ority levels o Supports a wide variety of access routines o Supports IBM MVS, VM, and VSE systems o Gateway Configuration Utility simplifies installation and config- uration 3 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A o Gateway Management Utilities simplify management and troubleshoot- ing o Supports SNA-initiated outbound sessions o DECnet-Plus and/or TCP/IP end node implementation o Access from DECnet-Plus or TCP/IP systems o TN3270 Server support Features Unique to the Domain Gateway-CT o Supports high-bandwidth communication using a block multiplexer chan- nel attachment to an IBM mainframe o Supports up to 1024 active sessions o Is upward compatible with Compaq SNA Gateway for Channel Transport Features Unique to the Domain Gateway-ST o Supports SNA synchronous communications using the SDLC protocol o Supports SDLC's Extended Response Mode, allowing a window modulo of 128 o Supports NRZI signaling mode on its synchronous data lines. This allows the Domain Gateway to support IBM data lines coded with ei- ther the NORMAL or NRZI option for the IBM NCP LINE resource def- inition o Supports full duplex transmission on its synchronous data lines. This allows data to be sent and received simultaneously. This set- ting corresponds to the DATMODE = FULL option for the IBM NCP PU resource definition o Supports up to 128 active sessions (depending on software license) o Is upward compatible with Compaq SNA Gateway for Synchronous Trans- port 4 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A o Supports the line configurations listed in Table 2 ___________________________________________________________________ Table_2:__Supported_DEC_MicroServer_Line_Configurations____________ Maximum Line Speed (Kbps) Electrical Interface_________19.2___56/64___128____256________________________ RS232-D/V.24 4 - - - V.35______________4______4_______2______1__________________________ Loading Compaq SNA Domain Gateway Software The Domain Gateway software is downline loaded into the DEC ChannelServer II or DEC MicroServer product over the Ethernet LAN from an OpenVMS Alpha, OpenVMS VAX, or Tru64 UNIX system, acting as DECnet-Plus load hosts. Most OpenVMS Alpha, OpenVMS VAX, and Tru64 UNIX systems can be used as Domain Gateway load hosts. The Hardware Requirements section of this Software Product Description describes valid configurations. Other networked systems requiring access to the SNA environment through the Domain Gateway should be configured with the appropriate SNA ac- cess routines. When loaded on the DEC ChannelServer hardware unit, the Domain Gate- way appears to the SNA network as an IBM 3088 Channel-to-Channel Adapter (CTCA). System programmers configure the IBM channel address as a 3088 device according to specifications listed in both the hardware and soft- ware user documentation. When loaded on the DEC MicroServer hardware unit, the Domain Gateway appears to adjacent front-end processors as another front-end proces- sor and appears to IBM hosts in the SNA network as another IBM host. IBM system programmers should configure the adjacent front-end pro- cessors and adjacent IBM hosts according to specifications listed in both the hardware and software user documentation. 5 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A Components The Compaq SNA Domain Gateway software includes two software compo- nents: the Domain Gateway Load Host software (with its Configuration Utility) and the Domain Gateway Management software. Domain Gateway Load Host Software The Domain Gateway Load Host software includes the system image that is downline loaded to one of the supported hardware units and the Con- figuration Utility that provides a convenient method for configuring the Domain Gateway. The Configuration Utility allows Domain Gateway managers to save an- swers and to modify discrete parts of the configuration. The Config- uration Utility can also read path definition files created by IBM net- work definition utilities and use that information in the Domain Gate- way configuration. Because the Domain Gateway supports multiple sessions per LU, the Do- main Gateway manager can configure a single LU for the access routines that support multiple sessions, thus reducing configuration time. Most Tru64 UNIX, OpenVMS Alpha, and OpenVMS VAX systems can serve as Domain Gateway load hosts. Domain Gateway Management Software The Domain Gateway Management software includes DECnet-Plus style net- work management tools for configuring, controlling, monitoring, and troubleshooting the Domain Gateway. The Domain Gateway manager can set up or modify parameters relating to routes, physical units, logical units, and other key variables necessary for network-to-network com- munications between the SNA and non-SNA networks. In addition, the Do- main Gateway Management software allows the manager to diagnose and solve most problems related to the Domain Gateway. These DECnet style network management tools are also available in a TCP/IP-only environ- ment. 6 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A Although all management of the Domain Gateway is performed from a gate- way management node in the non-SNA network, the management of the Do- main Gateway's SNA components is conceptually part of the management of the IBM SNA network. Therefore, the management of the routes and the data links connecting the Domain Gateway to the IBM network is the joint responsibility of the IBM system or network programmer and the Domain Gateway manager. The Domain Gateway Management software includes support for Network Control Language (NCL) commands, a monitoring utility (SNAP), and Com- mon Trace Facility (CTF) analysis routines. The SNAP utility displays the status of the Domain Gateway's buffer availability, the number of SNA sessions in progress, and information about the non-SNA and SNA networks. The CTF analysis routines help debug application programs and assist in identifying system problems by capturing and analyzing multiprotocol data. CTF can be used at the transmission group, vir- tual route, logical unit, or session level. The Domain Gateway Management software resides on a Domain Gateway load host system or, optionally, on additional nodes called Domain Gate- way management nodes. Most Tru64 UNIX, OpenVMS Alpha, and OpenVMS VAX systems can serve as Domain Gateway management hosts. Access Routines OpenVMS and Tru64 UNIX Compaq access routines can use the Domain Gate- way. The Domain Gateway supports Compaq-supplied access routines as either SLUs or PLUs. For example, an application written for Compaq SNA 3270 Applications Services access routine could enable 3270 ter- minals in an SNA network to connect to applications on OpenVMS sys- tems. The Domain Gateway works with all of the Compaq SNA access rou- tines. However,the Domain Gateway does not have a Remote Job Entry (RJE) server. Instead, the Compaq SNA RJE access routine uses an OpenVMS based RJE server. For additional information about supported access routines, see the Optional Software section of this Software Product Descrip- tion. 7 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A INSTALLATION Compaq recommends that a customer's first purchase of this software product include Compaq Installation Services. These services provide installation of the software by an experienced Compaq installation spe- cialist. HARDWARE REQUIREMENTS In Ethernet LANs o Alpha or VAX system configuration as specified in the relevant op- erating system Software Product Description to act as load host o DEC ChannelServer II or DEC MicroServer as described in the Com- munications Hardware Requirements section of this Software Prod- uct Description o VT series terminal for diagnostic use (Domain Gateway-CT only) Processors Supported For information about supported processors, refer to the Software Prod- uct Descriptions for the Tru64 UNIX Operating System (SPD 46.61.xx for V4.x, SPD 70.70.xx for V5.x) and the OpenVMS Operating System for Al- pha and VAX (SPD 25.01.xx). Processors Not Supported MicroVAX I, VAXstation I, VAX-11/725, VAX-11/782, VAXstation 8000 Disk Space Requirements (Block Cluster Size = 1) Disk space required for installation: OpenVMS Alpha 12,000 blocks (6 MB) OpenVMS VAX 37,000 blocks 8 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A (19 MB) Tru64 UNIX 5 MB Disk space required for use (permanent): OpenVMS Alpha 9,000 blocks (5 MB) OpenVMS VAX 36,000 blocks (17 MB) Tru64 UNIX 5 MB 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. In addition to disk space allocated to the Domain Gateway software, some disk space (approximately 8K to 10K blocks) should be reserved for any dump files that may be generated by the Domain Gateway. The location of these dump files is determined by the system administra- tor. In addition, each Domain Gateway configured will require addi- tional disk space for configuration scripts (upwards of 40 blocks [20 KB]). Communications Hardware Required Domain Gateway software runs on two hardware platforms: the DEC Chan- nelServer II and the DEC MicroServer. DEC ChannelServer II The DEC ChannelServer II hardware unit is no longer available, but is supported by the Domain Gateway software in the following forms: o DESNB-AA for use with 120 V ac power supplies o DESNB-A3 for use with 240 V ac power supplies Each DEC ChannelServer II hardware unit has a built-in Ethernet LAN controller, but needs a suitable connection to connect to the customer's Ethernet LAN along with any extension cables. 9 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A In addition, S/370 Bus and Tag cables (with terminators, if appropri- ate) are required for connection into the S/370 system. Note: A raised-floor environment is required for installation of a DEC ChannelServer II system. DEC MicroServer The DEC MicroServer is no longer available, but is supported by the Domain Gateway software in the following forms: o DEMSA-AA for use with 120 V ac power supplies o DEMSA-AB for use with 240 V ac power supplies The DEC MicroServer-SP is no longer available, but is supported by the Domain Gateway software in the following forms: o DEMSB-AA for use with 120 V ac power supplies o DEMSB-AB for use with 240 V ac power supplies Each DEC MicroServer hardware unit has a built-in Ethernet LAN con- troller, but needs a suitable connection to connect to the customer's Ethernet LAN along with any extension cables. Each DEC MicroServer hardware unit uses adapter cables to provide the necessary interchange circuits at the appropriate electrical inter- face types and ISO standard connections for each synchronous line. The DEC MicroServer supports up to four synchronous lines; therefore, it requires up to four adapter cables. Table 3 shows the cable number for each of the supported electrical interfaces. ___________________________________________________________________ Table_3:__DEC_MicroServer_Adapter_Cables___________________________ Electrical Adapter Connector/ Interface_______Cable_________Pinout_______________________________ RS232-D/V.24 BS19D-02 ISO 2110 10 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A ___________________________________________________________________ Table_3_(Cont.):__DEC_MicroServer_Adapter_Cables___________________ Electrical Adapter Connector/ Interface_______Cable_________Pinout_______________________________ V.35____________BC19F-02______ISO_2593_____________________________ IBM Hardware Support The DEC ChannelServer II hardware has been tested and warranted with the following IBM and PCM hardware configurations: o IBM 3044 Channel-Extender o IBM 3090 (All models) o IBM ES/9000 (All models) o IBM OS/390 o Amdahl 5860 o Amdahl 5870 o Amdahl 5990-700 o Amdahl 5990-1400 Note: The Amdahl 5890 is not supported with the IBM 3044 Channel Ex- tender. The DEC ChannelServer II hardware is supported on the ESCON converter (9034-1). OPTIONAL HARDWARE None SOFTWARE REQUIREMENTS 11 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A OpenVMS OpenVMS Operating System for Alpha and VAX, Version 6.2, 7.1 (VAX), 7.1-2 (Alpha), 7.2, 7.2-1 (Alpha), or 7.3 (SPD 25.01.xx). Using Compaq SNA Domain Gateway software requires a networking prod- uct appropriate for the version of OpenVMS. Networking options include: o TCP/IP Services for OpenVMS (SPD 46.46.xx) o DECnet-Plus (Phase V, SPD 50.45.xx for Alpha, SPD 25.03.xx for VAX). Choose a networking option appropriate for OpenVMS Versions 6.2, 7.1 (VAX), 7.1-2 (Alpha), 7.2, 7.2-1 (Alpha), or 7.3 from the following table: ___________________________________________________________________ OpenVMS_____TCP/IP______DECnet_V___________________________________ 6.2 4.2 6.3 7.1 5.1 7.1 7.1-2 5.1 7.1 7.2 5.1 7.2 7.2-1 5.1 7.2-1 7.3_________5.1_________7.3________________________________________ Tru64 UNIX A Tru64 UNIX operating system environment consisting of the follow- ing: o Tru64 UNIX V4.0D or later (SPD 46.61.xx for V4.x, SPD 70.70.xx for V5.x) o DECnet-Plus for Tru64 UNIX (SPD 41.92.xx) 12 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A Choose a version of DECnet-Plus appropriate for Tru64 UNIX versions as follows: ___________________________________________________________________ Tru64_UNIX______________DECnet-Plus________________________________ V4.0D or higher V4.0C V5.0_or_higher__________V5.0A______________________________________ For TCP/IP only environments on OpenVMS and Tru64 UNIX For a TCP/IP-only environment, the following DECnet-Plus subsets are required for management and downline loading of the gateway: o CTF User Environment o CTF Collector Components o Installed WAN Utilities o DECnet-Plus Network Management o DECnet-Plus MOP Utilities o DECnet-Plus Base Components o DECnet-Plus Datalink Components A DECnet-Plus license is not required. OPTIONAL SOFTWARE Table 4 lists the optional SNA access routines available for use with Compaq SNA Domain Gateway. For information on these products, consult the respective Software Product Descriptions. 13 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A ___________________________________________________________________ Table_4:__Access_Routines__________________________________________ Supported_on_OpenVMS_Alpha_Systems_________________________________ Compaq SNA 3270 Terminal Emulator for OpenVMS (SPD 26.84.xx) Compaq SNA APPC/LU6.2 Programming Interface for OpenVMS (SPD 26.88.xx) Compaq SNA Data Transfer Facility for OpenVMS (SPD 27.85.xx) Compaq DECnet SNA Application Programming Inter- face for OpenVMS (SPD 26.86.xx) Compaq DECwindows[TM] DECnet SNA 3270 Terminal Emulator for OpenVMS (SPD 31.58.xx) Compaq SNA 3270 Data Stream Programming Interface for OpenVMS (SPD 26.87.xx) Compaq SNA Printer Emulator for OpenVMS (SPD 26.70.xx) Compaq SNA Remote Job Entry for OpenVMS (SPD 26.85.xx) ___________________________________________________________________ Supported_on_OpenVMS_VAX_Systems___________________________________ Compaq SNA 3270 Terminal Emulator for OpenVMS (SPD 26.84.xx) Compaq SNA APPC/LU6.2 Programming Interface for OpenVMS (SPD 26.88.xx) Compaq SNA Data Transfer Facility for OpenVMS (SPD 27.85.xx) Compaq DECnet SNA Application Programming Inter- face for OpenVMS (SPD 26.86.xx) Compaq DECwindows DECnet SNA 3270 Terminal Emula- tor for OpenVMS (SPD 31.58.xx) 14 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A ___________________________________________________________________ Table_4_(Cont.):__Access_Routines__________________________________ Supported_on_OpenVMS_VAX_Systems___________________________________ Compaq SNA 3270 Data Stream Programming Interface for OpenVMS (SPD 26.87.xx) Compaq SNA Printer Emulator for OpenVMS (SPD 26.70.xx) Compaq SNA Remote Job Entry for OpenVMS (SPD 26.85.xx) ___________________________________________________________________ Supported_on_Tru64_UNIX_Systems____________________________________ Compaq SNA Data Transfer Facility for Tru64 UNIX (SPD60.54.xx) Compaq SNA APPC/LU6.2 Programming Interface for Tru64 UNIX (SPD 56.11.xx) Compaq SNA LUA Programming Interface for Tru64 UNIX (SPD 70.69.xx) Compaq_SNA_TN3270-C_for_Tru64_UNIX_(SPD_64.89.xx)__________________ OpenVMS Tailoring The following OpenVMS classes are required for full functionality of this layered product: o OpenVMS Required Saveset o Network Support For more information on OpenVMS classes and tailoring, refer to the OpenVMS Operating System for Alpha and VAX Software Product Descrip- tion (SPD 25.01.xx). 15 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A OpenVMS Cluster Environment This layered product is fully supported when installed on any valid and licensed VMScluster* configuration without restrictions. The Hard- ware Requirements sections of this product's Software Product Descrip- tion detail any special hardware required by this product. * VMScluster configurations are fully described in the OpenVMS Clus- ter Software Product Description (29.78.xx), and include CI, Eth- ernet, and Mixed Interconnect configurations. 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 distributed on the Compaq CD-ROM Software Product Li- brary for OpenVMS Alpha, OpenVMS VAX, and Tru64 UNIX. SOFTWARE WARRANTY This software is provided by Compaq with a 90-day conformance to war- ranty in accordance with the Compaq warranty terms applicable to the license purchase. WARRANTY LIMITATIONS IBM Supported Configurations This product is warranted with the IBM software configurations listed in the following table. 16 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A ___________________________________________________________________ Table_5:__IBM_Software_Configurations______________________________ Software Prod- uct________________Version__Release________________________________ ACF/NCP 6 3.0 7 4.0 ACF/VTAM 4 3.0, 4.0 OS/390 2 7.0, 8.0, 9.0, 10.0 VM/ESA 2 3.0, 4.0 z/OS_______________1________1.0____________________________________ Note: Compaq will support IBM software configurations, version and re- lease numbers, as long as support for such configurations is gener- ally available from IBM. Other configurations may have been tested since this SPD was published. Please contact your local Compaq office for up-to-date information regarding listed configurations. ORDERING INFORMATION Software Licenses: QL-MKHA9-AA 1024-session license for use with the DEC Chan- nelServer II hardware unit QL-23DA9-BG 32-session license for use with the DEC Mi- croServer hardware unit QL-23DA9-BR 128-session license for use with the DEC Mi- croServer hardware unit Software Documentation: QA-MKHAA-GZ Documentation-only kit (Media for this product is via the Compaq CD- ROM Software Product Library for OpenVMS Alpha, OpenVMS VAX, and Tru64 UNIX) 17 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A * Denotes variant fields. For additional information on available li- censes, services, and media, refer to the appropriate price book. SOFTWARE LICENSING Customers need a separate license for each hardware unit they load with the Domain Gateway software (except as otherwise specified by Compaq). The Compaq SNA Domain Gateway license applies to the hardware unit on which the software executes, not to the load host processor on which the software is configured. The single Domain Gateway license agreement includes the right to in- stall and configure the product on a backup load host, in standby mode, for downline loading the Domain Gateway in case of a failure at the primary load host. This backup load host installation requires dupli- cate installation of the primary Product Access Key (PAK). Under the terms of the software license, the Domain Gateway manage- ment utilities that are included in this product (NCL commands, SNAP, and CTF analysis routines) may be installed freely on alternate Gate- way management nodes in addition to the load host. A PAK is not nec- essary to install or execute the management utilities. This software is furnished under the licensing provision of Compaq Com- puter Corporation's Standard Terms and Conditions. For more informa- tion about Compaq's licensing terms and policies, contact your local Compaq representative. License Management Facility Support This product supports the License Management Facility on OpenVMS and Tru64 UNIX. 18 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A SOFTWARE PRODUCT SERVICES Installation Installation provides comprehensive installation and of Compaq and non- Compaq hardware, software, and networks products. These products in- clude systems, servers, upgrades, workstations, terminals, PCs, pe- ripherals, network equipment, operating systems, and layered products. Optional pieces of the Installation offer include site planning and preparation, orientation, and other projects which are based on the installation of computer equipment (e.g. relocation services). License Subscription License Subscription provides the license rights to use all new ver- sions of those products, which are released during the contract pe- riod. Also included are the rights to use certain server-resident prod- ucts whose license is included in a corresponding client license. Telephone Software Support Software Support provides software problem identification and reso- lution and operational support for system managers, technical support/helpdesk personnel who manage Compaq and popular multivendor server software in either a standalone or networked environment. This service provides access both to technical resources to assist in problem diagnosis and resolution and to Compaq's information database. This combination of support resources will address system management questions and inquiries on a wide variety of topics including information on the latest prod- uct features, known problems and available solutions, and operational advice and assistance to help the system manager, system administra- tor better manage its information technology environment. Please contact your local Compaq office for additional information on specific services in your area. © 2001 Compaq Computer Corporation COMPAQ and the Compaq logo Registered in U.S. Patent and Trademark Of- fice. DECnet and OpenVMS are trademarks of Compaq Information Tech- nologies Group, L.P. in the United States and other countries. 19 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A UNIX and The Open Group are trademarks of The Open Group. All other product names mentioned herein may be trademarks or regis- tered trademarks of their respective companies. Confidential computer software. Valid license from Compaq required for possession, use, or copying. Consistent with FAR 12.211 and 12.212, Commercial Computer Software, Computer Software Documentation, and Tech- nical Data for Commercial Items are licensed to the U.S. Government under vendor's standard commercial license. Compaq shall not be liable for technical or editorial errors or omis- sions contained herein. The information in this document is subject to change without notice. 20 Compaq SNA Domain Gateway, SPD 38.69.04 Version 2.1A 21