Nortel Communication Server 1000S Maintenance Manual page 145

There are three frame alignment thresholds set in LD 73. When a maintenance
or out-of-service threshold is reached, a DTA message is output as shown in
Figure 23.
Table 39
DTA message output
DTA019
DTA020
Figure 23
Frame alignment thresholds
DTA 019--maintenance threshold
A warning message is printed
LFAL 1-(17)-10240
LFAC 0-(3)-128
24 hour out-of-service limit.
Maximum number of times a PRI can be taken out of service
(DTA 020) in 24 hours. When this count is reached, the
PRI will not be restored to service automatically.
When LFAC is set to zero, the PRI will not be taken out-of-service.
1.5 Mb DTI/PRI maintenance
Frame alignment maintenance limit.
Frame alignment out of service limit.
1-(511)-10240
DTA 020--out-of-service threshold
The PRI is taken out of service and
red alarm (local alarm) is raised.
A red alarm due to DTA 020 must be cleared
manually.
ISDN Primary Rate Interface
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Maintenance