Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 405

Parameters
loop-timed — The link recovers the clock from the received data stream.
node-timed — The link uses the internal clock when transmitting data.
adaptive — The clock is adaptively recovered from the rate at which data is received and not from
crc
Syntax crc {16 | 32}
Context config>port>tdm>ds1>channel-group
config>port>tdm>ds3
config>port>tdm>e1>channel-group
config>port>tdm>e3
Description
This command configures the precision of the cyclic redundancy check (CRC).
Default 16 for non-ATM channel groups configured under DS-1, E-1 and for non-ATM E-3 and DS-3
channel/ports.
32 for ATM channel-groups configured under DS-1 and E-1, and for ATM E-3 and DS-3 channels/
ports. The default cannot be changed.
Parameters
16 — Use 16 bit checksum for the associated port/channel.
32 — Use 32 bit checksum for the associated port/channel.
down-count
Syntax down-count down-count
no down-count
Context config>port>sonet-sdh>path>cisco-hdlc
7750 SR OS Interface Configuration Guide
TDM DS1/E1
Channelized OC-12
Channelized OC-3
Channelized DS3/E3
Channelized ASAP OC-12
Channelized ASAP OC-3
Channelized ASAP DS3/E3
CES OC-3
the physical layer. Adaptive timing is only supported on ds1 and e1 channels.
LoopTimed
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Interface Configuration
Default
loop-timed
loop-timed
loop-timed
loop-timed
loop-timed
loop-timed
loop-timed
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