Page 372 7450 ESS OS Basic System Configuration Guide
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}]}
no interface-type
Context config>system>sync-if-timing>bits
Description This command configures the Building Integrated Timing Source (BITS) timing reference. This command is
not supported on the 7450 ESS-6, 7450 ESS-6v, 7450 ESS-1.
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.
Context
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 SR/
ESS router. In redundant systems with BITS ports, there are two possible BITS-in interfaces, one for each
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