Alcatel-Lucent 7710 SR SONET, Руководство по настройке

Страница: 285 / 496

Interface Configuration
7710 SR OS Interface Configuration Guide Page 259
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, SONET/SDH ports on an appropriate MDA/CMA.
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:
Parameters
loop-timed — The link recovers the clock from the received data stream.
node-timed — The link uses the internal clock when transmitting data.
Sonet/SDH Loop Timed Default
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