Lucent Technologies FiberReach DDM-2000 User Manual

363-206-305
Transmission and Synchronization
Issue 3 June 2000
5-15
Figure 5-7. Synchronization Failure and Reconfiguration
Synchronization Provisioning Integrity
5
A welcome byproduct of synchronization messaging is the prevention of
provisioning errors. Provisioned timing loops on the DDM-2000 FiberReach
Multiplexers will be quickly detected through the synchronization messaging
algorithm and prevented by forcing a shelf into holdover. The system can then be
reprovisioned correctly.
Feature Details and Options
5
As mentioned previously, SONET synchronization messaging is used to
communicate the quality of the subnetwork timing throughout the subnetwork.
This is done using bits 1 through 3 of the K2 byte found in the SONET overhead. If
a DDM-2000 FiberReach system is deriving timing from a given OC-N interface
and synchronization messaging is enabled on that interface (Kbyte messages are
enabled using the
set-ocn
user interface command or
ent-rr
TL1 command),
the system interprets the received message to determine its internal timing status.
The DDM-2000 FiberReach system also transmits over the particular OC-N
PRS
Traceable
BITS
Normal
PRS
Traceable
BITS
Sync Flow
Failure/Reconfiguration
DDM-2000
FiberReach
DDM-2000
FiberReach
DDM-2000
FiberReach
DDM-2000
FiberReach
DDM-2000
FiberReach
DDM-2000
FiberReach
tpa 843628/01
DDM-2000
OC-3 or
SLC®-2000
ARM Shelf
DDM-2000
OC-3 or
SLC-2000
ARM Shelf

Lucent Technologies FiberReach DDM-2000 Specifications

General

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