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Configuring Dial Services

1-4

117353-B Rev. 00

Network Access Methods and Services

The router initiates, monitors, and terminates dial-up connections using a modem

or ISDN terminal adapter that supports Raise DTR, V.25bis, or Hayes signaling,

or a router with a built-in ISDN interface connected directly to an ISDN network.

If the router has internal ISDN capability, you do not need external dial devices.

All three dial services enable the router to access a switched network as follows:

• Integrated ISDN capability -- Provides a BRI or PRI for digital connectivity

from the router to the destination device, replacing standard analog phone

lines. Using signals on an ISDN line, the router instructs the network to set up

a call to a particular destination. ISDN capability eliminates the need for dial

devices such as modems, because you no longer need to convert digital

signals to analog. An ISDN network also allows you to send data, voice, and

video over the same digital line.

• Raise DTR -- A signaling method that enables access to the network by

preprogramming the destination phone numbers into the dial device (modem

or ISDN terminal adapter). Raise DTR signaling works with the following

interfaces: X.21, V.35, RS-232, and RS-422.

• V.25bis -- A signaling method that enables access to the network by passing

the destination phone numbers from the router to the dial device (modem or

ISDN terminal adapter). This method lets the dial device support connections

to multiple destinations. V.25bis signaling works with the following

interfaces: X.21, V.35, RS-232, and RS-422.

• Hayes -- A signaling method that enables network access by passing the

destination phone numbers from the router to the dial device (modem or ISDN

terminal adapter). Using Hayes signaling, the router sends an AT initialization

command to interact with the dial device. The ARN internal V.34 modem uses

Hayes signaling. Hayes signaling works with RS-232 interfaces.

The method you choose depends on your application, network resources, and the

type of network to which you are connecting. ISDN, a complex networking

technology, is further explained in Chapter 4.

Note:

For BRI service, you need a network terminator 1 (NT1) to connect to

an ISDN network. With the exception of the ARN, the router’s ISDN/BRI

Module does not include an internal NT1, so you or your service provider must

supply it.

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