Bit Error Rate Thresholds - Nortel Communication Server 1000S Maintenance Manual

The CRC error counter is displayed with the LCNT L command in LD 60
provided that loop L has been defined with ESF as a framing format. The
framing format (D2, D3, D4, or ESF) is selected in LD 17 when the loop is
configured.

Bit error rate thresholds

There are three bit error rate thresholds set in LD 73. When a threshold is
reached, a DTA message is output. See Figure 4.
DTA011:
DTA012:
DTA013:
Figure 4
BIPV and BIPC thresholds
BIPV
BIPC 0-(2)-128
The BIPV thresholds are based on the number of errors in a given time. The
threshold levels are shown in Table 10 on
Primary Rate Interface maintenance
Bit error rate maintenance threshold.
Bit error rate out-of-service limit.
Too many bit error rate out-of-service occurrences in
24 hours.
DTA011—maintenance threshold
A warning message is printed.
1 - (3) - 4
1 - (2) - 4
DTA012—out-of-service threshold
The PRI is taken out of service and red
alarm (local alarm) is raised. The PRI is restored
automatically when performance improves (indicated
by DTA014).
DTA013—24-hour out-of-service limit
Maximum number of times a PRI can be
taken out of service (DTA012) in 24
hours. When this count is reached, the
PRI will be restored to service
automatically only if BIPC is set to zero.
ISDN Primary Rate Interface
Page 59 of 210
page 60.
Maintenance