System Management
Basic System Configuration Guide 399
The bits command subtree is only available on the 7450 ESS-7, 7450 ESS-12, 7750 SR-7, 7750 SR-
12, 7750 SR-12e, 7750 SR-c4, 7950 XRS-20, 7950 XRS-40, 7950 XRS-16c, 7750 SR-a4, 7750 SR-
a8, 7750 SR-1e, 7750 SR-2e, and 7750 SR-3e.
Default disabled
commit
Syntax commit
Context config>system>sync-if-timing
Description This command saves changes made to the system synchronous interface timing configuration.
Default No default
interface-type
Syntax interface-type {ds1 [{esf | sf}] | e1 [{pcm30crc | pcm31crc}] | 2048khz-g703}
no interface-type
Context config>system>sync-if-timing>bits
Description This command configures the Building Integrated Timing Source (BITS) timing reference.
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.
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