Grade-Of-Service Messages; 2.0 Mb Dti Alarms - Nortel Meridian 1 Option 11C Manual

Page 68 of 126 DTI Maintenance

Grade-of-Service messages

2.0 Mb DTI Alarms

553-3011-315 Standard 13.00
Grade-of-Service messages (DTA XXX) provide near and far end switch
status. A summary of these status messages is given in Table 21:
Table 21
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 may be either continuous or spurious.
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.
January 2002
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