Lucent Technologies FiberReach DDM-2000 - Maintenance Signaling - VT Ring Application

363-206-305
Maintenance Description
9-12
Issue 3 June 2000
Figure 9-4 shows an example of the maintenance signals used by the DDM-2000
FiberReach Multiplexer in a VT path-switched ring application.
Figure 9-4. Maintenance Signaling — VT Ring Application
DDM-2000
OC-N
Ring 2
DS1
DS1AIS*
STS-Path Yellow
VT-Path Yellow*
Ring 1
OC-N
LOS
LOF
Line AIS
DDM-2000
OC-N
Ring 2
DS1
DS1AIS*
STS-Path Yellow
VT-Path Yellow*
Ring 1
OC-N
STS-LOP
STS Path AIS
STS Sig Fail
DDM-2000
OC-N
Ring 2
DS1
DS1AIS*
Ring 1
OC-N
DDM-2000
OC-N
Ring 2
DS1
Ring 1
OC-N
VT LOP
FERF
VT-Path Yellow*
M
A
I
N
1
M
A
I
N
2
M
A
I
N
1
M
A
I
N
2
M
A
I
N
1
M
A
I
N
2
M
A
I
N
1
M
A
I
N
2
STS-Path Yellow
VT-Path Yellow
VT-Path Yellow*
VT-Path Yellow*
VT-Path AIS
VT-Path Yellow*
VT-Path Yellow‡
Line FERF
DS1/VT paths selected from the failed ring (Ring 1).
STS Unequipped
‡ VT-Path Yellow on pass-through or continue paths only.
§ VT-Path AIS not sent for unequipped.
† VT-Path AIS is sent on pass-through or continue paths only.
* VT-Path Yellow, DS1 AIS, and VT Path AIS are only sent on
VT Unequipped §
VT-Path AIS †
VT-Path AIS †
VT-Path AIS †