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General
Troubleshooting
To troubleshoot the fiber-optic link hardware, you can use the diagnostic,
HPFLDIAG, described earlier in this chapter. Section 12 of the diagnostic
provides detailed troubleshooting methods to isolate hardware faults. If
HPFLDIAG is not available, or you choose a more direct approach, use the
following procedures:
1.
Perform the HP-FL PCA fault isolation tests.
2.
Perform the fiber-optic cable fault isolation tests.
3.
Perform fault isolation tests on the remote device.
These procedures are described in the remainder of this chapter.
peA Fault Isolation
The PCA or its firmware PROMs may be faulty. PCA fault isolation testing
consists of running the PCA self-test with a loopback cable attached, and
observing the PCA LEDs.
If the self-test fails and the C, S, and R LEDS are on, the PROMs are defective. If
possible, test the PROMs by moving them to a "known good" PCA and use the
procedures below. If the test fails, the PROMS are the faulty element.
1.
Disconnect the duplex cable from the PCA.
2.
Connect the transmit port directly to the receive port using a single
fiber. Use the fiber-optic loopback cable (HFBR-3020), if available.
3.
Run the self-test: Reset the PCA by switching off the computer power,
then switching it on. (Be sure to shut down the operating system first.)
4.
Observe the LEDs and determine if the PCA is good. Figure
3-2
and
table 3-3 show the pattern of the LEDs with a loopback cable installed
for a good PCA. Any other pattern means the PCA has failed the
self-test. You should replace it.
Self-test failure
Figure 3-2. Testing the HP-FL PCA with a Loopback Cable
3-10 Troubleshooting and Diagnostics
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Table of Contents
Troubleshooting
