Avaya DEFINITY Server CSI Maintenance Manual page 763

ATM-TRK (Circuit Emulation Service Circuit Pack)
e. Error Type 257: Control Channel Loop Test #52 failed. The circuit pack is
not properly connected with the control channel on the TDM bus.
1. Take the corrective action specified by Test #52.
f. Error Type 513: ATM Crosstalk Test (#1298) failed. The board is writing to
or reading from a TDM time slot that is not allocated to the board, or the
Digital Signal Processor (DSP) selected for this test has malfunctioned.
1. Run test board UUCSS .
2. Take the corrective action specified for Test #1298.
g. Error Type 769, 770: the ATM switch is requesting too many LAPD
retransmissions (off-board ATM cell corruption errors).
Error Type
769
770
1. Check the connections between the fiber cable, the ATM-TRK circuit
2. See PKT-BUS (Packet Bus) for test and corrective procedures.
3. Determine what type of fiber is installed between the ATM-TRK
4. Perform ATM loopback tests on the near-end ATM-TRK circuit pack
555-233-119
Aux Data Description
35 LAPD excessive retransmission requests
25 ATM uncorrectable cell headers - threshold
pack, and the ATM switch.
circuit pack and the ATM switch.
If
There is multimode fiber
There is single-mode fiber or
the length of the multimode
fiber is less than 2 km
and on the far-end circuit pack or ATM switch.
If
The ATM-TRK circuit pack
fails the loopback test.
The far-end circuit pack or
ATM switch fails the
loopback test.
The equipment at each end
of the ATM span passes
the loopback test
Then
Check the length of the fiber. If the
cable is longer than 2 km, it is probably
causing the errors.
The source of the errors can lie in the
ATM facility, the ATM-TRK circuit pack,
or the far-end circuit pack.
Then
The problem is in the ATM-TRK circuit
pack. Replace the circuit pack.
The problem is in the far-end circuit pack
or ATM switch. Consult the circuit-pack or
ATM switch documentation for advice.
The problem is somewhere in the ATM
span. Lack of bandwidth can be forcing
an intermediate ATM switch to drop cells.
Issue 5 October 2002
763