SUMMARY: selecting twisted pair

From: Scott Taylor <smt_at_gamma.physics.uiowa.edu>
Date: Tue, 21 Sep 1999 11:06:29 -0500

Thanks to all: Ian Mortimer
             John Losey
             Sean O'Connell
             Stuart C. Sides
             John P Speno
             Terry Werstlein
             Ian Lawrence
             Tom Webster
             Joe Fletcher
             Peter Stern
             Jacques Maleyrot
             Ralph Wegner
             Rob Mayfield
             Marco Luchini
             Werner Rost
             John Speakman
             
It was a matter of setting ewa0_mode to Twisted-Pair at the console prompt. Here is one of the
many thorough responses:

The NIC mode (speed and media) can be set via console variables. The
variable that you are looking for is "ewa0_mode" (at least for Tulips) --
if you have a second interface it is "ewb0_mode".

To switch to twisted-pair media, do the following:

1. Take the system down to the console propmpt.

2. At the propmpt, enter "show ewa0_mode" that should return "AUI",
   your current mode.
   
3. Set the desired mode, in this case "set ewa0_mode twisted" and
   issue an "init" to write the vars to the eeprom and reinit the
   system.
   
   TIP: If you aren't sure of the mode, enter a truely bogus value
   and relatively modern firmware shoudl give you a list of valid
   modes, i.e. "set ewa0_mode XXXX".


Original post:

> I just tried switching an alphastation 500 & 600 over to twisted pair from thin
> wire. The network cards in the machines support both. I brought the machines
> down, did the switch, and brought them up but the twisted pair connection wasn't
> recognized. When the machines come up they indicate that tu0 is still switched
> to BNC. I haven't been able to find anything in the docs about selcting or
> configuring the connection type (BNC or 10BASET/twisted pair). I did find a
> note in the User Information Guide vaguely suggesting that the system will sense
> the connection. The lack of info also seems to suggest this, as does the fact
> that other systems (e.g. SUN) automatically sense the connection. Does anyone
> have any ideas?
     
>Thanks,

>Scott Taylor
>smt_at_gamma.physics.uiowa.edu
            
                        
Received on Tue Sep 21 1999 - 16:09:02 NZST

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