Command:  

physical-layer


Mode:


Router(config-if)#


Syntax:

physical-layer {sync | async}

no physical-layer

Syntax Description:

sync

Places the interface in synchronous mode. This is the default.

async

Places the interface in asynchronous mode.

Command Description:

To specify the mode of a slow-speed serial interface on a router as either synchronous or asynchronous, use the physical-layer command in interface configuration mode. To return the interface to the default mode of synchronous, use the no form of this command.


Example:

This example changes a low-speed serial interface from synchronous to asynchronous mode:

Router(config)#interface serial 2

Router(config-if)#physical-layer async

Misconceptions:

None


Related commands:

None

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