DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-233ATM-TRK (Circuit Emulation Service Circuit Pack)
3
e. Error Type 257: Control Channel Loop Test #52 failed. The circuit pack is
not properly connec ted 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 malfunc tioned.
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 corrup tion errors).
1. Check the connections b etween the fiber cab le, the ATM-TRK
circuit pack, and the ATM switch.
2. See the PKT-BUS for test and corrective procedures (Aux Dat a 35
only).
3. Determine what type of fiber is installed between the ATM-TRK
circuit pac k and the ATM switch.
Error
Type
Aux
Data Description
769 35 LAPD excessive retransmission requests
770 25 ATM uncorrectable cell headers - threshold
If Then
There is multimode fiber Check the length of the fiber. If the cab le
is longer than 2 km, it is probably causing
the errors.
There is single-mode fib er
or the length of the
multimode fiber is less
than 2 km
The source of the errors may lie in the
ATM facility, the ATM-TRK circuit pack, or
the far-end circuit pack.