SIGNAL PATH
The quickest way to isolate problems in a single connection is by module substitution. If sufficient spares are not available to carry out this strategy, the next best recourse is path substitution:
1.Route the problem signal to a new crosspoint/output address.
2.If new route does not correct the problem, the source port circuitry is probably faulty. Verify by reconnecting the source machine to a new port, or by swapping the two I/O modules. The upper of the two I/O modules supports ports
3.Assuming the new route of Step 1 passed signal, route any signal to the problematic output with the I/O cards swapped. Signal passes? Then the I/O module is defective. No Go? The crosspoint module is at fault.
MAPPING AND COMMAND PROBLEMS
Most switch problems result from the complexity of the control system interface. Refer to section 3 (older systems) or the UniDiag manual (newer systems) for a discussion of the
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