Configuration Commands
Page 404 7750 SR OS Interface Configuration Guide
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.
TDM DS3/E3 LoopTimed Default
Channelized OC-12 No node-timed
Channelized OC-3 No node-timed
Channelized DS3/E3 No node-timed
Channelized ASAP OC-12 Yes node-timed
Channelized ASAP OC-3 Yes node-timed
Channelized ASAP DS3/E3 Yes node-timed
CES OC-3 Yes node-timed
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