Interface Configuration
7750 SR Interface Configuration Guide Page 487
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 phys-
ical layer. Adaptive timing is only supported on ds1 and e1 channels.
differential — The clock is recovered from differential RTP timestamp header.
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
config>port>tdm>ds1>channel-group>cisco-hdlc
config>port>tdm>ds3>cisco-hdlc
config>port>tdm>e1>channel-group>cisco-hdlc
config>port>tdm>e3>cisco-hdlc
Description This command configures the number of keepalive intervals that must pass without receiving a keepalive
packet before the link is declared down. It is expected that the nodes at the two endpoints of the cHDLC link
are provisioned with the same values.
Default 3
down-count — Specifies the number of keep alive intervals that must pass without receiving a keep alive
packet before the link is declared down.
Values 3 — 16
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