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

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Name

half-duplex controlled-carrier — interface

Synopsis

half-duplex controlled-carrier
no half-duplex controlled-carrier

Configures

Controlled carrier mode versus constant carrier mode

Default

Constant carrier mode

Description

Low speed serial interfaces use constant carrier mode by default. This command places the interface in controlled carrier mode; it can be used only on interfaces that have been configured for half-duplex.

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