DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1686TBRI-PT (TN2185 ISDN Trunk-Side BRI Port)
9
CRC Error Counter Test (#623)
This test is nondestructive.
This test reads the BRI port’s CRC error counters that are maintained on the BRI
circuit pack. The Cyclic Redundancy Check (CRC) is a means of error detection
used to determine the integrity of data frame contents. The CRC error counter is
incremented by the circuit pack when it detects a CRC error. The test passes if
the value of the counter is 0 (that is, the error is cleared). If the counter is
non-zero, the test fails, and the value of the counter is displayed in the
Error
Code
field.
Receive FIFO Overflow Error
Counter Test (#625)
This test is nondestructive.
This test reads and clears the BRI port’s Receive FIFO Overflow error counter
maintained on the TBRI-BD circuit pack. This counter is incremented by the
circuit pack when it detects an overflow of its receive buffers. The test passes if
the value of the counter is 0 (that is, the error is cleared). If the counter is
non-zero, the test fails, and the value of the counter is displayed in the Error Code
field.
This error can occur if signaling frames are being received from the Packet Bus
at a rate sufficient to overflow the receive buffers on the circuit pack for a port OR
if a hardware fault is causing the receive buffers not to be emptied properly by
the circuit pack. This test is useful for verifying the repair of the problem.
Table 9-633. TEST #623 CRC Error Counter Test
Error
Code
Te s t
Result Description/ Recommendation
ANY FAIL This error occurs when a frame with a bad CRC is received over the
D-Channel by the BRI board. This error is reported on a per-port basis
when the counter goes over the threshold. This error is most likely due to a
problem with the wiring or interference on the wiring caused by a noise
source or no termination. It usually does not indicate a problem with the
circuit pack.
PASS The CRC error counter was read correctly and has a value of 0.
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