Lucent Technologies FiberReach DDM-2000 - Page 231

363-206-305
Transmission and Synchronization
Issue 3 June 2000
5-19
In Figure 5-8c, the DDM-2000 FiberReach Multiplexer at site C detects the
incoming IC message and sends out the IC message to site D. The DDM-2000
FiberReach Multiplexer at site C cannot switch to line time from the other rotation
because it is receiving the TLB message on that interface.
In Figure 5-8d, the DDM-2000 FiberReach Multiplexer at site D detects the
incoming IC message. Because this DDM-2000 FiberReach Multiplexer is
receiving the SQU message from site A, it will switch to line time from site A
because SQU is higher quality than IC. After the switch occurs, the TLB message
is sent back to site A and the SQU message is retransmitted to site C.
Figure 5-8. Synchronization Reconfiguration — Access Ring (Sheet 2 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
SQU
IC
c) Site C Changes Message
d) Site D Reconfigures
IC
IC
TLB
IC
IC
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
DDM-2000
OC-3 or
SLC-2000
ARM Shelf
tpa 843630/01