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

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Name

physical-layer — interface

Synopsis

physical-layer {sync | async}
no physical-layer {sync | async}

Configures

Whether the interface is synchronous or asynchronous

Default

sync

Description

This command lets you specify whether a serial interface is synchronous or asynchronous. It is available on low-speed serial interfaces.

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