Interface Configuration
7750 SR OS Interface Configuration Guide 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:
Sonet/SDH Loop Timed Default
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 OC-12 No node-timed
ATM OC-3 No node-timed
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