DEFINITY ECS Release 8.2 ATM Installation, | Issue 1 |
Upgrades, and Administration | April 2000 |
6 Troubleshooting |
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Troubleshooting | |
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■The ATM switch does not recognize that a port circuit pack is in the slot. You may need to
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, LOF, LOS, 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.
Call processing (CaPro) Layer
Are control channels being established from the PPN to the EPN?
Diagnostics.
■Do you get a dial tone on a set on the port network in question?
■Can you ring a set on the EPN dialing from the PPN and
