Alcatel-Lucent 7450 Basic System Configuration Manual page 400

System Command Reference
bits-interface-type
Syntax bits-interface-type {ds1 [{esf | sf}] | e1 [{pcm30crc | pcm31crc}] | 2048khz-g703}
no bits-interface-type
Context config>system>sync-if-timing>ref1
config>system>sync-if-timing>ref2
Description This command configures the interface type of the BITS timing reference.
This command is only supported on the 7750 SR-c12.
The no form of the command reverts to the default configuration
Default ds1 esf
Parameters
ds1 esf — Specifies Extended Super Frame (ESF). This is a framing type used on DS1 circuits
ds1 sf — Specifies Super Frame (SF), also called D4 framing. This is a common framing type
e1 pcm30crc — Specifies the pulse code modulation (PCM) type. PCM30CRC uses PCM to
e1 pcm31crc — Specifies the pulse code modulation (PCM) type. PCM31CRC uses PCM to
2048khz-g703 — Specifies the 2048 kHz synchronization interface (T12) of ITU-T G.703. This
input
Syntax input
Context config>system>sync-if-timing>bits
Description This command provides a context to enable or disable the external BITS timing reference inputs to the
central clock of the router. In redundant systems with BITS ports, there are two possible BITS-in
interfaces, one for each CPM or CCM. In the 7750 SR-c4 system, there are two bits ports on the CFM.
The two BITS-in interfaces are configured together, but they are displayed separately in the show
command.
Default
shutdown
400
that consists of 24 192-bit frames, The 193rd bit provides timing and other functions.
used on DS1 circuits. SF consists of 12 192-bit frames. The 193rd bit provides error checking
and other functions. ESF supersedes SF.
separate the signal into 30 user channels with CRC protection.
separate the signal into 31 user channels with CRC protection.
parameter is only available on the 7450 ESS-7, 7450 ESS-12, 7750 SR-7, and 7750 SR-12
when there is a CPM5 or later installed. It is also available on the 7750 SR-12e, 7750 SR-a4,
7750 SR-a8, 7750 SR-1e, 7750 SR-2e, and 7750 SR-3e.
Basic System Configuration Guide