Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 373
input
Syntax input
Context config>system>sync-if-timing>bits
Description This command enables the context to configure BITS input timing ports parameters on the
7705 SAR-18.
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 specifies the signal type for the BITS input and output ports. If you configure
the signal type as ds1, the system automatically defaults to esf. If you configure the signal
type as e1, the system automatically defaults to pcm30crc.
The no form of the command reverts to the default configuration.
Default ds1 esf
Parameters ds1 esf — specifies Extended Super Frame (ESF). ESF is a framing type used on DS1
circuits. ESF consists of 24 192-bit frames. The 193rd bit provides timing and other
functions.
ds1 sf — specifies Super Frame (SF), also called D4 framing. SF 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 PCM30CRC as the pulse code modulation (PCM) type.
PCM30CRC uses PCM to separate the signal into 30 user channels with Cyclic
Redundancy Check (CRC) protection.
e1 pcm31crc — specifies PCM31CRC as the PCM type. PCM31CRC uses PCM to
separate the signal into 31 user channels with CRC protection.
output
Syntax output
Context config>system>sync-if-timing>bits
Description This command enables the context to configure BITS output port parameters on the
7705 SAR-18.
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