Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 373

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, and OC-48 and OC-192 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:
7750 SR OS Interface Configuration Guide
Sonet/SDH
OC-192
OC-48
OC-12
OC-3
Channelized OC-12
Channelized OC-3
Channelized ASAP OC-12
Channelized ASAP OC-3
CES OC-3
ATM OC-12
ATM OC-3
Interface Configuration
Loop Timed
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
No
No
Default
loop-timed
loop-timed
node-timed
node-timed
loop-timed
loop-timed
loop-timed
loop-timed
loop-timed
node-timed
node-timed
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