Lucent Technologies DDM-2000 OC-3, User & Service Manual

Page: 2521 / 2536

DLP-565
: Detailed Level Procedure 363-206-285
Page 1 of 4 Issue 2, February 2000
DDM-2000 OC-3 M
ULTIPLEXER
Sync Messaging
Change Kbyte to Sbyte
1. NOTE:
This procedure may be used to change Kbyte sync messaging to Sbyte
sync messaging.
Use
rtrv-alm:
command to verify that there are no alarms or protection
switches present on the system.
2. NOTE:
To minimize the amount of time that DDM-2000 shelves are in holdover
mode when upgrading a ring network from Kbyte to Sbyte messages, it is
recommended that you first upgrade the node(s) farthest away from the
external timing source, then proceed to nodes closer to the timing source.
For example, if all the line timed nodes in the network shown in Figure 1
had their
Sync Source (src)
set to
main1
, the farthest node from the
external timing source would be Node D.
NOTE:
Note that in Figure 2, if Node B is changed to Sbyte first, then Node C will
go into holdover. Note that in Figure 3, if Node D is changed to Sbyte first,
then Node C and Node B, none of the nodes will go into holdover.
Use the
rtrv-sync:/set-sync:
command at each node in the network to
display/set the synchronization source.
3. Use
rtrv-oc3:/set-oc3:
command to verify/enable sync messaging
(kbyte) at each node.
4. Determine the farthest node from the external timing source.
5. Use
set-oc3:syncmsg=Sbyte
command to enable Sbyte sync messaging
at each node, starting from the node furthest from the external timing source.
6. Use the
rtrv-sync:
command to display the provisioning and operational
information of the synchronization interface.
7. STOP. YOU HAVE COMPLETED THIS PROCEDURE.