
Configuration Commands
Page 252
7750 SR OS 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 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 for transmitted data from either the internal clock or from a clock
recovered from the line’s receive data stream.
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. 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.
MDA Supports
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 DS-3
Yes
loop-timed
Channelized ASAP
Yes
loop-timed
Channelized ASAP
Yes
loop-timed
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