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C-16800-A2-GN22-30 January 1997
Maintaining Multiplexers
Overview C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Troubleshooting Procedures C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Port Failure C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiplexer Problems C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NAP Speed C-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Event Port Failure C-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Faulty Connections C-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Configuration Errors C-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Event Log Printer Problems C-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Systems Port Failure C-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
This appendix explains how to identify and resolve communications problems between the NMS
and the multiplexers it monitors. Communications between the NMS and the multiplexers takes
place via the following three ports on the host processor:
• Command Port. The command port handles two-way communication. Some of its
activities include transporting commands to the nodes and permitting polling.
• Event Port. The event port handles one-way communication. This port receives events from
the multiplexers.
• External Systems Port. This port is dedicated to the multiplexer external systems
(cut-through) interface.
This appendix begins with a discussion of some general hardware troubleshooting procedures that
you should follow. It then provides procedures for detecting and solving specific problems
associated with each of the three ports.
General Troubleshooting Procedures
Whenever a communications problem occurs, you should use the following general procedure:
1. Check the hardware connections.
2. Check the multiplexer for problems.
3. Check the host processor and IPC-1600 card for problems (see Chapter 8, Running
Diagnostics for detailed instructions).
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