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101

Command Reference Guide T1 Interface Configuration Command Set

clock source <option>

Use the clock source command to configure the source timing used for the interface. The clock specified

using the clock source command is also the system master clock. Use the no form of this command to

return to the default value.

Syntax Description

Configures the timing source for the T1 interface.

internal

Configures the unit to provide clocking using the internal oscillator.

line

Configures the unit to recover clocking from the primary circuit.

through

Configures the unit to recover clocking from the circuit connected to the DSX-1

interface.

Default Values

<option> line

Command Modes

(config-t1 1/1)# T1 or DSX-1 Interface Configuration Mode required.

(config-t1 1/2)#

Command History

Release 1.1 Command was introduced.

Functional Notes

When operating on a circuit that is providing timing, setting the

clock source

line

can avoid errors such as

Clock Slip Seconds (CSS).

Usage Examples

The following example configures the unit to recover clocking from the circuit:

(config)#

interface t1 1/1

(config-t1 1/1)#

clock source line

1 2 ... 330 331 332 333 334 335 336 337 338 339 340 ... 567 568

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