Configuration Commands
Page 250
7710 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, and 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 for transmitted data from either the internal clock or from a clock
recovered from the line’s receive data stream. It defines the reference
slot/mda
cma/port
for the
system clock as that of an incoming (optical) line signal. This source serves to drive an external office
clock through the BITS/SSU out ports, or just to drive the system clock.
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.
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
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