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Command Reference

Release 11.1 CA

clock source

To control which clock a T3 interface or a PA-T3 serial port adapter will use to clock its transmitted

data from, use the clock source interface configuration command. To restore the default value, use

the no form of this command.

clock source {internal

| line}

no clock source

Syntax Description

Default

The line’s receive data stream.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 10.3.

This command was modified in Cisco IOS Release 11.1 CA to include the T3 serial port adapter and

PA-T3 serial port adapter.

This command applies to a Cisco 4000 router or Cisco 7000 series, Cisco 7200 series, and

Cisco 7500 series router. A T3 interface on a PA-T3 serial port adapter can clock its transmitted data

from either its internal clock or from a clock recovered from the line’s receive data stream.

Example

The following example specifies the T3 interface to clock its transmitted data from its internal clock:

interface serial 1/0

clock source internal

internal Specifies that the interface will clock its transmitted data from

its internal clock.

line Specifies that the interface will clock its transmitted data from a

clock recovered from the line’s receive data stream (default).

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