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1001MC test mode diagnostics 282
Model 1001MC Operations Guide 11 • Troubleshooting and maintenance
Using the System Log to check for network problems
The System Log (see figure 143) is a messaging system that stores information about the system as it is running.
Do the following to display the
System Log: Non-Volatile Memory page for help in troubleshooting a problem:
1. From the HOME page, click on the System Log, then Non-Volatile Memory... links to display the System
Log: Non-Volatile Memory page (see figure 143).
Figure 143. System Log: Non-Volatile Memory page displaying warnings and errors
2. Examine the page for error or warning are entries (warnings are highlighted in yellow and errors are high-
lighted in red).
If you are able to determine the cause of the problem by using the System Log, apply appropriate remedies
to resolve the situation. (If the remedy includes replacing a NetLink modem, refer to the user manual that
came with the rack card for the procedure on replacing the defective rack card.)
Otherwise, check rack card LEDs in the malfunctioning rack to see if one is displaying a fault condition
(refer to the user manual that came with each rack card for information on using front-panel LEDs to
troubleshoot problems).
If you are still unable to determine the source of the problem, refer to section “1001MC test mode diagnostics”
for information on performing diagnostics tests to isolate the problem.
1001MC test mode diagnostics
The Model 1001MC provides the following diagnostics tests and loops that are very helpful when troubleshoot-
ing NetLink modems connections:
• five11 (511)—When this test is applied, it causes the V.52 bit error rate (BER) test pattern generator built-
into the NetLink modem to output (using a mathematical polynomial) a psuedo-random bit pattern of 511
bits. The receiving NetLink modem decodes the received bits using the same polynomial. If the received