System Command Reference
400 Basic System Configuration Guide
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
that consists of 24 192-bit frames, The 193rd bit provides timing and other functions.
ds1 sf — Specifies Super Frame (SF), also called D4 framing. This is a common framing type
used on DS1 circuits. SF consists of 12 192-bit frames. The 193rd bit provides error checking
and other functions. ESF supersedes SF.
e1 pcm30crc — Specifies the pulse code modulation (PCM) type. PCM30CRC uses PCM to
separate the signal into 30 user channels with CRC protection.
e1 pcm31crc — Specifies the pulse code modulation (PCM) type. PCM31CRC uses PCM to
separate the signal into 31 user channels with CRC protection.
2048khz-g703 — Specifies the 2048 kHz synchronization interface (T12) of ITU-T G.703. This
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.
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
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