| 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 |
A customers ring consists of a couple of 3COM hubs with a
concentrator in each, hooked up as a dual ring. On each hub
is an FDDI M port card, and hanging off of these is
3x vaxs with demfa's and 2x cisco ags's.
The demfa's are clocking up ~ 2 / min "MAC lost count"
I have had a look at the ansi spec, which says "....an error
is detected such that the credibilty of PDU reception is placed
in doubt..."
can anyone explain exactly what this means
Thanks in advance
Colin
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1151.1 | KONING::KONING | Paul Koning, B-16504 | Wed Nov 17 1993 15:21 | 13 | |
Yes, nice cryptic description... The real meaning: "lost count" is incremented when a non-data symbol, other than a valid termination, is encountered in the middle of a frame. (For example, an R symbol in the middle of data will cause this. Idle does not; that's a "fragment" which is not counted, and is normal.) Possible causes include bit errors on the wire, or defective stations. Examine the LEM counters to see if it's bit errors, and fix the offending connection if so. paul | |||||