Nortel Communication Server 1000S Maintenance Manual page 162

Page 162 of 210
Grade-of-service messages
2.0 Mb DTI alarms
553-3001-517 Standard 2.00
2.0 Mb DTI maintenance
Grade-of-Service messages (DTA XXX) provide near-end and far-end switch
status. A summary of these status messages is given in Table 46.
Table 46
Grade-of-service messages
Status
Acceptable
Maintenance
No new data calls
No new calls
Out of Service
There are two groups of alarm indicators monitored by the 2.0 Mb DTI.
Within these two alarm groups, there are several individual alarm types.
Group 1 alarms are event-driven and include indicators that decrement a
counter whenever an error is detected. Grade-of-service is changed based on
how quickly the threshold of the counter is exceeded. The threshold count is
determined in LD 73 and downloaded to the 2.0 Mb DTI. Group 1 alarms are:
1 Bipolar Violations (BPV) — Near-end alarm
2 Slips (SLP) — Near-end alarm
3 Frame Alignment Problems (FAP) — Near-end alarm
4 Cyclic Redundancy Check (CRC-4) — Near-end alarm
Group II alarm indicators are either continuous or discontinuous. Grade-of-
service is changed based on the duration of the alarm within a defined period
of time. A minimum persistence time is defined in LD 73 and downloaded to
the 2.0 Mb DTI.
September 2004
2.0 Mb DTI capability
Both incoming and outgoing calls
allowed
Both incoming and outgoing calls
allowed
No new outgoing data calls
No new outgoing data or voice calls
2.0 Mb DTI is disabled