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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
Troubleshooting
6-34Troubleshooting ATM-PNC
6
■ The ATM switch does not recognize that a port circuit pack is in the slot.
You may need to re-administer the ATM switch port boards. Refer to your
ATM switch’s quick reference guide for further information.
Recommended Action.
1. Plug in, swap, repair, or replace the fiber as necessary.
2. Verify that the port circuit pack is completely inserted.
SONET/SDH layer
Are SONET/SDH frames reaching the ATM switch?
Is the ATM switch port’s LED indicating no cell traffic?
■ Check the transmit and receive cell count fields. Each field’s values
should be increasing if the TN2305/TN2306 is actively sending and
receiving cells to and from the ATM switch.
■ Check for SONET/SDH layer alarms, LOP, LUF, and so on.
■ If neither field is increasing, the ATM switch port may be down. Verify that
the admin status is up.
■ If the receive cell count is increasing but the transmit cell count is not
increasing, this may be because the port was administered with no UNI
signaling. Ensure that signaling is UNI3.1.
■ Although the error counters may not be zero, they should not be large
either compared with the receive and transmit cell counters. If the
counters are large and increasing, check the fiber integrity. Make sure the
fiber pairs are securely plugged into both the TN2305/TN2306 circuit pack
and the ATM switch.
■ If the fiber has been pulled and reinserted as part of fault diagnosis, the
nonzero loss of signal error counter may be correct.
Q.SAAL (data link) layer
Are ATM signaling messages reaching the ATM switch Call Control?
NOTE:
If the TN2305/TN2306 circuit pack is not connected to the ATM switch at
the Q.SAAL protocol layer, then no report is displayed.
1. If the port of interest is not configured for UNI signaling, then the port was
administered for no UNI signaling. Verify that signaling is UNI3.1.
2. If the port of interest was administered for UNI3.0 signaling, verify that
signaling is UNI3.1.
3. Check to see if the TN2305/TN2306 circuit pack is actively sending and
receiving Q.SAAL Protocol Data Units with the ATM switch.