020
If the port error LED lights regularly or intermittently, the problem may be caused by:
1. Port clocking inconsistency
Verify the port clocking parameter: for synchronization purposes, one side of the connection must be
clock = internal and the other side should be clock = external.
Note: Both sides with clock = external will generate errors and make the port error LED go ON.
2. Sonet framing or scrambling inconsistency
The default for the 826x is Frame format = SONET STS-3c and Scrambling mode = Frame AND
Cell. Ensure that these values have not been changed or are still compatible with the port
configuration set at the other end of the link.
Note: As previously mentioned, this will cause framer mal-functions and the port error LED will go
ON.
3. Sonet errors/alarms or Poor line quality:
Enter
set device contact command (and enter the same date as given by the show clock
command). You have now access to hidden commands, and will get extended status information.
Enter the
show port <slot.port> verbose command several times and verify the following extra
information:
Remote device is active
Frame format: SONET STS-3c
Scrambling mode: frame and cell
Clock mode: internal
The following 11 indicators report current status of the port framer. If one of the status is
in UPPERCASE, there is an anomaly on the line
Signal Detect: active
RDOOL Status: inactive
Loss Of Signal: inactive
Loss Of Frame: inactive
Line FERF: inactive
Line AIS: inactive
Path FERF: inactive
Path AIS: inactive
Loss Of Pointer: inactive
Loss Cell Delineation: inactive
Out Of Frame: inactive
The following two counters report errors detected on the incoming traffic. I one of the
counters report a number higher than 0 errors have been encountered (It is often correlated
with anomalies on the preceding counters).
B1 Errors Counter: 0
HCS Errors Counter: 0
If problems occur:
Perform wrap tests on the module. Replace the module or daughter card or both if the test failed.
Perform the end-to-end wrap test. If remote device supports it (826x 155/622M ports support
Wrap reply mode to perform this test), to check end to end connection.
If the wrap tests are successful, connect an analyzer to the line to monitor traffic and line statuses.
Have the problem fixed on the line or on the remote device.
Chapter 2.
MAPS
2-67
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