363-206-295
Maintenance Description
Issue 1
December 1997
9-11
Figure 9-3.
Example of Main Signal as a Result of Unprotected Incoming OC-12 Failure
1
Line
FERF
3
OLIU
- Line AIS
- STS-1 LOP
4
- Any of
5
6
- Office Alarms
- LEDs
- Telemetry Outputs
- CIT Initiated Reports
Legend
1
2
- Any of
3
- Incoming DS3 Signal
Failure (FE)
2
5
DS3
Terminal
DSX-3
2
fn-c
2
Incoming
- LOS
- LOF
- LINE AIS
- LOP
2
3
2
3
fn-a
fn-b
CO
DDM-2000 OC-3
END RT
3
OLIU
OLIU
OLIU
LIKELY CAUSES
LIKELY CAUSES
LIKELY CAUSES
Main
Main
Main
DS3 Yellow
STS-1 Path Yellow
STS-1 Path AIS
Local Indicator
DS3 AIS
2
1
DDM-2000 OC-12
DDM-2000 OC-12 System HUB RT
OC-12 Failure
6
6
3DS3
fn-d
6
Line FERF
6
6
3
2
- OC12 LOS
- OC12 LOF
- 3DS3 CP Failure (FE)
- OLIU CP Failure (NE)
- 3DS3 CP Failure
- Any of
LIKELY CAUSES
4
or
DS3 LOS, LOF
- Any of
LIKELY CAUSES
2
- 3STS1E CP Failure (FE)
3STS1E
4
3
FT-2000,
DACSIV-2000,
DDM-2000 OC-3
