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 Cyc lic Redundancy Chec k (CRC) is a means of error detection
used to determine the integ rity of data frame contents. The CRC error counter is
incremented by the c ircuit pack when it d etects a CRC error. The test passes if
the value of the counter is 0 (that is, the error is c leared). If the counter is
non-zero, the test fails, and the value of the coun ter 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 Rec eive FIFO Overflow error counter
maintained on the TBRI-BD circuit pac k. This counter is incremented b y the
circuit pack when it detects an overflow of its rec eive buffers. The test passes if
the value of the counter is 0 (that is, the error is c leared). If the counter is
non-zero, the test fails, and the value of the counter is di splayed in the Error Code
field.
This error can occur if signaling frames are being recei ved from the Packet Bus
at a rate sufficient to overflow the receive buffers on the c ircuit pack for a p ort OR
if a hardware fault is causing the rec eive buffers not to be empti ed properly by
the circuit pac k. This test is useful for verifying the repair of the prob lem.
Table 9-633. TEST #623 CRC Error Counter Test
Error
Code Test
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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