Interface Configuration
7750 SR OS Interface Configuration Guide 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
the physical layer. Adaptive timing is only supported on ds1 and e1 channels.
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
TDM DS1/E1 LoopTimed Default
Channelized OC-12 Yes loop-timed
Channelized OC-3 Yes loop-timed
Channelized DS3/E3 Yes loop-timed
Channelized ASAP OC-12 Yes loop-timed
Channelized ASAP OC-3 Yes loop-timed
Channelized ASAP DS3/E3 Yes loop-timed
CES OC-3 Yes loop-timed
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