Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 404

Configuration Commands
Cisco HDLC monitors line status on a serial interface by exchanging keepalive request messages
with peer network devices. It also allows routers to discover IP addresses of neighbors by exchanging
Serial Link Address Resolution Protocol (SLARP) address-request and address-response messages
with peer network.
Only IES SAPs (including SAPs in VPRN service) can provision a Cisco-HDLC-capable
configuration.
clock-source
Syntax clock-source {loop-timed | node-timed | adaptive}
Context config>port>tdm>ds1
config>port>tdm>ds3
config>port>tdm>e1
config>port>tdm>e3
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, the node central
reference, or an adaptively recovered clock using the received packets.
The following tables show MDAs that support loop timing at DS3/E3 and DS1/E1 channelization
options.
Page 404
TDM DS3/E3
Channelized OC-12
Channelized OC-3
Channelized DS3/E3
Channelized ASAP OC-12
Channelized ASAP OC-3
Channelized ASAP DS3/E3
CES OC-3
LoopTimed
No
No
No
Yes
Yes
Yes
Yes
7750 SR OS Interface Configuration Guide
Default
node-timed
node-timed
node-timed
node-timed
node-timed
node-timed
node-timed