Lucent Technologies FiberReach DDM-2000 User Manual

363-206-305
Transmission and Synchronization
5-20
Issue 3 June 2000
In Figure 5-8e, the DDM-2000 FiberReach Multiplexer at site C detects the
incoming SQU message from site D. The SQU message is a better quality
message than the IC message being received from site B, so the DDM-2000
FiberReach Multiplexer at site C switches to line time from site D. After the switch
occurs, the TLB message is sent back to site D, and the SQU message is
retransmitted to site B.
In Figure 5-8f, the DDM-2000 FiberReach Multiplexer at site B detects the
incoming SQU message from site C. The SQU message is a better quality
message than the internal holdover capability, so the DDM-2000 FiberReach
Multiplexer at site B switches to line time from site C. After the switch occurs, the
TLB message is sent back to site C, and the SQU message is forwarded to site A.
When the failure clears, the synchronization remains in the new configuration
unless it is manually switched back.
Figure 5-8. Synchronization Reconfiguration — Access Ring (Sheet 3 of 3)
PRS
Traceable
BITS
PRS
Traceable
BITS
Sync Flow
SQU
Site A
Site B
Site C
SQU
TLB
TLB
SQU
SQU
Site D
Site C
SQU
TLB
f) Site B Reconfigures
IC
TLB
IC
e) Site C Reconfigures
SQU
TLB
SQU
SQU
DDM-2000
FiberReach
DDM-2000
FiberReach
DDM-2000
FiberReach
DDM-2000
FiberReach
Site B
DDM-2000
FiberReach
Site D
DDM-2000
FiberReach
DDM-2000
OC-3 or
SLC®-2000
ARM Shelf
Site A
SQU
DDM-2000
OC-3 or
SLC-2000
ARM Shelf
tpa 843631/01

Lucent Technologies FiberReach DDM-2000 Specifications

General

Brand	Lucent Technologies
Model	FiberReach DDM-2000
Category	Multiplexer
Language	English