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

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Name

dialer dtr — interface

Synopsis

dialer dtr
no dialer dtr

Configures

Enables DDR and specifies that the modem handles only DTR signaling

Default

None

Description

Configures interfaces that are connected to modems that require DTR (Data Terminal Ready) , and enables DDR. Interfaces configured with this command cannot receive calls; they can only make them.

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