Command Reference

clock source

To control which clock a G.703-E1 interface will use to clock its transmitted data from, use the clock source interface configuration command. The no form of this command restores the Default value.
clock source {line | internal}
no clock source
clock source {line {primary | secondary} | internal} (Cisco AS5200 only)
no clock source line {primary | secondary}

Syntax Description

line Specifies that the interface will clock its transmitted data from a clock recovered from the line's receive data stream (Default).

internal Specifies that the interface will clock its transmitted data from its internal clock.

primary Primary TDM clock source.

secondary Secondary TDM clock source.

Default

By Default, the applique uses the line's receive data stream.

Primary TDM clock source from the T0 controller on the Cisco AS5200.

Secondary TDM clock source from the T1 controller on the Cisco AS5200.

Command Mode

Interface configuration

Usage Guidelines

On the Cisco 4000 router, Cisco 7000 series, and Cisco 7500 series router, a G.703-E1 interface can clock its transmitted data from either its internal clock or from a clock recovered from the line's receive data stream.

To use the clocking coming in from a T1 line for the Cisco AS5200, configure the clock source line primary command on the controller that has the most reliable clocking. Configure the clock source line secondary command on the controller that has the next best known clocking. With this configuration, the primary line clocking is backed up to the secondary line if the primary clocking shuts down.

Example

The following example specifies the G.703-E1 interface to clock its transmitted data from its internal clock:
clock source internal
  
The following example configures the Cisco AS5200 to use the T0 controller as the primary clocking source and the T1 controller as the secondary clocking source:
AS5200(config)# controller t1 0
AS5200(config-if)# clock source line primary
AS5200(config-if)# exit
AS5200(config)# controller t1 1
AS5200(config-if)# clock source line secondary
  

line	Specifies that the interface will clock its transmitted data from a clock recovered from the line's receive data stream (Default).
internal	Specifies that the interface will clock its transmitted data from its internal clock.
primary	Primary TDM clock source.
secondary	Secondary TDM clock source.