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| 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 |
1965.0. "non DEC RJ45 logging high counters" by CSC32::D_HIGHLAND () Fri Feb 23 1996 18:23
Has anyone seen high counts of LEM, LCT, connects completed, and
ring inits on a 900MX UTP mod pmd port with third party cables?
Mainly the connector head itself.
What we've found is a slight difference in connector length, but it
appears to be making a real difference in the connection, or lack
of in this case.
At this point it is only speculative, however, we've seen it one
other time, as soon as the DEC cable was used, the above mentioned
counters quieted.
File access and copies are failing, the port LEDs go from Green to
Amber...then back to green after a couple of minutes. We've tried
other ports, other MX's, other controllers, and OS (OpenVMS and
WNT).
We have tried other cables but all have been made outside DEC.
Since the configuration is valid, and the versions are all
current (except the MX is running V3.1.1 ...I think the latest
there is V3.2.x). We've asked the customer to try one of our
cables. (big sale!)
Has anyone seen similar symptoms with non-DEC cables?
Dave Highland
CSC/CS
Crossed in Hub Mgt conference
| T.R | Title | User | Personal
Name | Date | Lines |
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| 1965.1 | note string from HUB_MGNT | NETCAD::MELARAGNI | | Sun Feb 25 1996 19:43 | 44 |
| <<< NETCAD::KALI$USER3:[NOTES$LIBRARY]HUB_MGNT.NOTE;1 >>>
-< DEChub/HUBwatch/PROBEwatch CONFERENCE >-
================================================================================
Note 3304.2 non DEC RJ45 logging high counters 2 of 3
NETCAD::MELARAGNI 15 lines 23-FEB-1996 14:15
-< do they have the correct cable? >-
--------------------------------------------------------------------------------
Are you sure that the non-DEC cables are actually Cat 5 behind-the-wall
cables?
There are two kinds of Cat 5 cable -- "behind-the-wall" and "patch cord".
"Behind-the-wall" cable is designed to meet the EIA/TIA-568 specs for
cable loss for lenghts up to 90m. Patch cord has a much higher loss and as
such is limited to 10m total length. If your customer is using patch
cord of lengths greater than 10m, then this might be the problem.
You can usually tell patch cord from the behind-the-wall cable by the
flexible nature of the patch cord. The behind-the-wall cable is usually
stiff.
bill
<<< NETCAD::KALI$USER3:[NOTES$LIBRARY]HUB_MGNT.NOTE;1 >>>
-< DEChub/HUBwatch/PROBEwatch CONFERENCE >-
================================================================================
Note 3304.3 non DEC RJ45 logging high counters 3 of 3
CSC32::D_HIGHLAND 14 lines 23-FEB-1996 18:15
-< It's patch cord and may exceed 10m >-
--------------------------------------------------------------------------------
He is connected to his Alpha's PCI UTP controller (DEFPA) directly from
the 900MX MOD PMD UTP port. No "behind-the-wall." This is the reason
he went to the third party make. Digital's solution (I don't have the
part number) for this cable was only 3 meters. He needed at least 6
meters, however, it may actually be longer, I'll have to check.
Our 3 meter cable appears to be for wall connections only.
I will cross post this in FDDI as well.
Thanks for the information.
Dave
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