Appendix B. Understanding TR-08
B-2
TSU 610 User Manual
61200610L2-1
Table B-1. Alarm Conditions
Name
Explanation
FELP
When the TSU 610 receives a FELP alarm, it will loop
the incoming data directly to the outgoing data.
LINE ON is placed in history. The alarms and loop-
back are cleared when FELP is no longer received.
Loss of Data
The TSU 610 will send
Minor Alarm
and the
A Shelf
Alarm
for 2.5s when it quits receiving the data link on
the T-Span. It will also report TR-08 DL Down in the
history. After 2.5s,
Major Alarm
, and
A Shelf Alarm
are sent across the
Data Link
.
OOF
The TSU will send
Minor Alarm
and
A Shelf Alarm
upon receiving an out-of-frame condition. TR-08 DL
Down and
Red Alarm
are declared in history for se-
vere framing errors. After 2.5s,
Major Alarm
and
A Shelf Alarm
are sent across the
Data Link
.
Loss of Signal
The TSU 610 will send
Minor Alarm
and the
A Shelf
Alarm
for 2.5s when it stops receiving a signal from
the far end. It will also report TR-08 DL Down and
LOS in the history. After 2.5s,
Major Alarm
and
A Shelf Alarm
are sent across the
Data Link
, and
Red
Alarm
is declared in history.
BPVs
BPVs that are received at a rate greater than the
threshold set under TR-08 options, will cause
Minor
Alarm
and
A Shelf Alarm
to be sent on the DL. If the
BPVs remain above the threshold for 2.5s, the TSU
610 will send
Major Alarm
on the DL. No events are
placed in history.
Protection Line
Switch
The TSU will not respond to this alarm.
Summary of Contents for 1200610L2
Page 20: ...Table of Contents xx TSU 610 User Manual 61200610L2 1...
Page 24: ...List of Tables xxiv TSU 610 User Manual 61200610L2 1...
Page 56: ...Chapter 3 Operation 3 12 TSU 610 User Manual 61200610L2 1...
Page 94: ...Chapter 4 T1 Network Interface 4 38 TSU 610 User Manual 61200610L2 1...
Page 142: ...Appendix B Understanding TR 08 B 4 TSU 610 User Manual 61200610L2 1...
Page 156: ...Appendix E Specifications E 4 TSU 610 User Manual 61200610L2 1...
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