Reference Manual

Transport network O&M functions-DXX Support
Each of the statistics are supported by two groups of registers and two
groups of counters providing the performance data. The registers and
counters can be read and reset.
They are:
•
Counters for current 15 minutes report
•
Registers for previous 15 minutes report
•
Counters for current 24 hours report
•
Registers for previous 24 hours report
The information of the 15 minutes counters and registers are sent
together in one report. The information of the 24 hours counters and
registers are sent together in another report.
G.821 limits alarm
An alarm is activated when at least one G.821 performance limit has
been executed in a 15–minute period. The performance limits can be
changed from DXX.
The G.821 Performance limits supervised are:
•
Limit for Severely Errored Seconds (SES), with the values
between 0 and 900.
•
Limit for Errored Seconds (ES), with the values between 0 and
900.
•
Limit for CRC-E, with the values between 0 and 65000.
•
Limit for Remote Alarm Indication (RAI), with the value between
0 and 900.
G.821 Performance basic statistics counters
For limited statistics a number of counters are reported with a
performance counter value. The counters can be read and reset on
request.
The following counters are supported:
• Total Time (TT)
•
Available Time (AT)
• Severely Errored Seconds (SES)
• Errored Seconds (ES)
• Degraded Minutes (DM)
Description of performance data
AT Available time is the total time (TT)
minus unavailable time (UAT).
A period of unavailable time (UAT)
begins at the onset of 10 consecutive SES.
These 10 seconds are considered to be
392 (421)
EN/LZT 720 0008 R1A
2001-06-26
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