| Title: | FDDI - The Next Generation |
| Moderator: | NETCAD::STEFANI |
| Created: | Thu Apr 27 1989 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2259 |
| Total number of notes: | 8590 |
I'm having a problem at a GM site in Flint hooking up a DEFZA-AA in a
DECsystem 5000/240 to a Cabletron hub. The problem is that I can't get
the DEC BN24D-10 cable bayonet end connectors to hook up to the DEFZA
board although they will connect just fine to all the other like-ended
fiber equipment in the computer room (three different vendors). Yes, I do
know how to hook up FDDI cables. Specifically, the problem seems to be
that the dimension from the outside face of the backing plate on the DEFZA
board - to the locking pin on the connector tube on the board - is too
small to allow the BNC-like locking hub on the cable end to be pushed
far enough in toward the board to be rotated and locked in place on the
locking pins. On all the other fiber equipment in evidence, this
dimension is much larger - which allows the cable to connect properly.
The BNC-like hubs on this cable are plastic - the ones I've been used to
in the past had metal locking hubs that were much thinner in the required
dimension and worked without problem. DECdirect is telling me that they
shipped the correct cable. I'm going to try and get the local Field
Service folks to provide a cable with metal hubs. However, can anybody
shed some light on what's wrong here? Do I have a bad cable, board, or
what - or do our DEFZA boards have non-standard dimensions and require
special cables? It would be good to get this resolved before someone
else runs into it. Thanks.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 954.1 | Sounds like an 'old' DEFZA | LEVERS::KIRK | tis a gift to be simple | Wed May 19 1993 13:44 | 18 |
This has been fixed in a later version of the DEFZA. The connectors
that are giving you this problem are probably the ST-2 (or STII)
type. These came out on the market after we shipped the DEFZA. We
made a modification to it to accept the ST-2 connectors, but it seems
that you have an older version.
All of the BN24D-xx cables that I have in the lab are terminated with
the ST-1 connectors. It might be that the ST-1 connectors have been
discontinued, and replaced with the ST-2s. So finding an older cable
should address your problem.
All of our current ST based adapters now accept ST-2 connectors, as
far as I am aware.
Richard Kirk
Networks Engineering
Network Interface Products Group
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| 954.2 | It's not that old | GLDOA::MAPPLEGATE | Thu May 20 1993 18:40 | 8 | |
Thanks very much for your response. The system and controller in question
were shipped and installed last month - so it looks like we're still
putting the old version out there. I'm glad the problem has been
fixed by engineering. However, it would be good to get the word out -
nobody I talked to in DECdirect, Sales support, Colorado internal support,
or field service knew anything about this. The current field service fix
apparently is to bore two holes in the appropriate spot on the system
bulkhead to get more clearance. Seems a little drastic to me.
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