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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

service-module 56k — interface

Synopsis

service-module 56k parameters
no service-module 56k parameters

Configures

Internal 56k (DS0) CSU/DSU

Default

Depends on the command

Description

The service-module commands are for routers that have 56k CSU/DSU modules built into them. These commands set various options on the internal CSU/DSU. The parameters that can be configured are:

clock rate speed

Configures the line speed for a four-wire 56k line. The valid speeds are 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64. The default is 56.

clock source {line | internal}

By default, the clock source is the line, which is provided by the carrier. This command allows you to switch to the internal clock source on the module.

data-coding {normal | scrambled}

normal data coding is the default behavior for service modules. scrambled data coding should be used only on lines configured for 64 Kbps. Both ends of the link must use the same data coding.

network-type {dds | switched}

Determines whether the line is configured for DDS (unswitched) or switched service. dds is the default for four-wire service; switched is the default for two-wire service.

remote-loopback

By default, the service module accepts remote-loopback commands from the remote CSU/DSU. To disable remote loopback, use the no form.

switched-carrier {att | sprint | other}

The switched-carrier setting must be appropriate for your 56k provider. att is the default on four-wire CSU/DSUs; sprint is the default on two-wire CSU/DSUs. This command can be ...

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