Lucent Technologies DDM-2000 OC-3 User Manual

363-206-285
Transmission and Synchronization Interfaces
5-50 Issue 3 June 2001
Dual Homing DRI Synchronization Configurations 5
OC-3 and FT-2000 OC-48 Lightwave System 5
Figure 5-25 shows how OC-N timing can be distributed from an FT-2000 OC-48
Lightwave System line switched ring to a DDM-2000 OC-3 path switched ring
using a dual homing DRI configuration. The OC-3 DRI nodes are connected via
OC-3 point-to-point links terminating in function unit C slots. The major
characteristics of this configuration are:
■ The FT-2000 OC-48 Lightwave System nodes are through-timed and
derive timing from different rotations of the OC-48 ring.
■ The FT-2000 OC-48 Lightwave System must be provisioned to write
stratum 3 synchronization message to the K2 byte so the DDM-2000 ring
can use synchronization messaging.
■ The two DDM-2000 OC-3 DRI nodes coordinate timing using
synchronization status messages on the OC-3 ring so that all nodes will
accept timing in the same direction.
■ The two DDM-2000 OC-3 DRI nodes must be provisioned for line timing
with timing derived from function unit C. Synchronization messaging on the
OC-3 span between the two OC-3 DRI nodes must be disabled so timing
loops are not formed. Synchronization messaging and automatic
synchronization reconfiguration should be enabled on all other OC-3
interfaces on the DRI nodes.
■ All other OC-3 nodes must be provisioned for line timing with
synchronization messaging and automatic synchronization reconfiguration
enabled.

Lucent Technologies DDM-2000 OC-3 Specifications

General

Brand	Lucent Technologies
Model	DDM-2000 OC-3
Category	Multiplexer
Language	English