Nortel North American DMS-100 Instruction Manual page 622

TOPS MPX Token Ring LAN troubleshooting
(Sheet 2 of 2)
Message
Number
DFIPD081E
DFIPD101E
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
Explanation
Message:
Display buffer overflow - data lost
Meaning: The area that stores display messages is full. New
data is lost. This problem can occur because the Ring
Diagnostic remains in Pause or Help too long. This problem
can also occur because the system generates messages too
fast for the display.
The system generates messages too fast when the user
activates Full E.R. or Limited E.R. on a ring with a high error
rate.
Action: To return to the Ring Diagnostic in the Help mode,
press F3 (End). If you are not in the Help mode, deactivate
Pause, Full E.R., or Limited E.R. functions.
Variable Data: Does not apply
Message:
Ring error limit exceeded
Meaning: The number of soft errors exceeds the limit. This
can degrade the performance of the ring. When this message
appears, ring status is Soft Error.
Action: Record the ring status. Write down the addresses of
the first and second adapters.
• To clear the error counters, press the F9 (Reset Counts)
key. If the errors continue, disconnect the adapters that
cause the errors. Reset the counters again. If errors do not
continue, troubleshoot the terminals that cause the
problems. Look for defective cables, connectors, or loose
connections.
• If the preceding action does not solve the problem, a
defective MAU can be the cause of the problem. Isolate
the MAU where the terminals were connected and run the
test again. If this action does not solve the problem,
replace the MAU.
• If the problem persists, it is possible that there is more than
one defective MAU. Continue troubleshooting to locate
any additional defective MAUs or adapters.
Variable Data:
1-601
(continued)