Reference Manual

Transport network O&M functions-DXX Support
• Rx Buffer slip/BUFIN (Slip)
This fault is only used for E1. The fault is activated if one or
more buffer slips have been detected during the last hour. A slip is
defined as where one frame (0.125 ms) is either lost or duplicated.
• Status for CSU line loop back, LLB (T1)
This message is only used for T1. It indicates that the CSU line
loop back is activated.
• Status for CSU payload loop back, PLB (T1)
This message is only used for T1. It indicates that the CSU
payload loop back is activated.
51.4.7 DXX Alarm history report
This function is initiated during restart of the DXU if the parameter
TNOM_use in RBS DB is already set to ON, otherwise the function is
initiated when the parameter is set to ON.
This function sends Alarm history reports to DXX. The reports are sent
from RBS to DXX upon request. The fault conditions are described in
Section 51.4.5 on page 389.
The RBS maintains an alarm history in its alarm event log which is a
ring buffer for 100 latest alarm events. The alarm events are:
alarm on, alarm off and delta (combined alarm on and off).
The delta alarm event type is used when an alarm is turned on and off
within a short period, i.e. an alarm has occurred but is not still active.
51.4.8 DXX G.821 Performance reports
The following statistics are provided in G.821 performance reports:
•
Total Time (TT)
• Available Time (AT)
•
Severely Errored Seconds (SES)
• Errored Seconds (ES)
•
Degraded Minutes (DM)
• Number of CRC errors from far end (CRCE)
• Number of seconds when RAI has been received (RAI)
• Number of Code Violation (CV)
• Number of CRC block errors (CRC)
• Number of faulty Frame Synchronization Word (FSW)
• Number of lost Frame Synchronization (FS)
• Number of Rx Buffer slip (BUFIN)
EN/LZT 720 0008 R1A
2001-06-26
391 (421)
© Ericsson Radio Systems AB
— All Rights Reserved —