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Conference 7.286::fddi

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

1350.0. "Elasticity buffer error" by JFSGWY::KOITABASHI (Koji Koitabashi, CSC/TOKYO) Tue May 31 1994 00:44

 I have a simple question about elasticity buffer error. A DEMFA encounts
the EBUF error on OSF/1 system. The DEMFA is connected DECconcentrator.
The DEMFA and a port card of the DECconcentrator were replaced. But the
EBUF error still exists. If upstream neighbor station of the DEMFA is sun's 
station, do we have to replace the sun's station? There is a elasticity buffer
in PHY chip and each port of DECconcentrator has a PHY chip I think. If so, 
the DECconecntrator should be replaced rather than the station. Is it correct?

Thanks, Koji. 

	+---------------+         +---------------+
        |DECconcentrator|---------|DECconcentrator|
        |               |---------|               |
        +--+--+--+--+---+         +--+--+--+--+---+
           |  |  |  |                |  |  |  |
           |  |  |  open             |  |  |  |
           D  S  S                  DECbridgesXXXs
           E  U  U
           M  N  N
           F
           A

T.R Title User Personal
Name Date Lines

1350.1 KONING::KONING Paul Koning, B-16504 Tue May 31 1994 16:30 15

T.R	Title	User	Personal Name	Date	Lines
1350.1		KONING::KONING	Paul Koning, B-16504	`Tue May 31 1994 16:30`	15
	Unfortunately, the elasticity buffer error does not tell you precisely where the problem is. It simply tells you that at this point in the ring a problem was detected. The original cause of the problem is upstream, but it may be upstream a fair distance. So yes, the Sun nodes could indeed be the cause of the problem. Or it could even be in the other concentrator or the bridges. But the Sun nodes are the next best guess given that you have ruled out the DEMFA and the concentrator port. You could try either replacing the Sun FDDI adapter, or you could disconnect those nodes (or partition the network) to try to isolate it. (Unfortunately, partitioning or disconnecting can hide the problem...) paul

Unfortunately, the elasticity buffer error does not tell you precisely where
the problem is.  It simply tells you that at this point in the ring a problem
was detected.  The original cause of the problem is upstream, but it may be
upstream a fair distance.

So yes, the Sun nodes could indeed be the cause of the problem.  Or it could
even be in the other concentrator or the bridges.  But the Sun nodes are the
next best guess given that you have ruled out the DEMFA and the concentrator
port.

You could try either replacing the Sun FDDI adapter, or you could disconnect
those nodes (or partition the network) to try to isolate it.  (Unfortunately,
partitioning or disconnecting can hide the problem...)

	paul