Alcatel-Lucent 7750 - Page 454

Interfaces
Page 454 7750 SR Interface Configuration Guide
SONET/SDH Port Commands
sonet-sdh
Syntax sonet-sdh
Context config>port
Description This command enables access to the context to configure SONET/SDH ports. This context can only be used
when configuring an OC-3, OC-12, OC-48, OC-192, and OC-768 SONET/SDH ports on an appropriate
MDA.
The 10 Gigabit Ethernet LAN port also has SONET/SDH characteristics. However, these characteristics are
predetermined and not configurable.
clock-source
Syntax clock-source {loop-timed | node-timed}
Context config>port>sonet-sdh
Description This command configures the clock to be used for transmission of data out towards the line. The options are
to use the locally recovered clock from the line's receive data stream or the node central reference.
Note: When changing the clock source for a port on an OC-48 MDA, a brief transmit interruption can occur
on all ports of that MDA. Note that all SONET/SDH MDAs/CMAs support loop timing. The following table
show MDAs that support loop timing:
Sonet/SDH Loop Timed Default
OC-768
Yes node-timed
OC-192
Yes loop-timed
OC-48
Yes loop-timed
OC-12
No node-timed
OC-3
No node-timed
Channelized OC-12
Yes loop-timed
Channelized OC-3
Yes loop-timed
Channelized ASAP OC-12
Yes loop-timed
Channelized ASAP OC-3
Yes loop-timed
CES OC-3
Yes loop-timed
ATM O C - 1 2
No node-timed
ATM O C - 3
No node-timed