Avaya Configuring Dial Services Manual de usuario descargar pdf (Pagina 34)

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101

Configuring Dial Services

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308621-14.00 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 can access a switched network using the following

methods:

• Integrated ISDN capability -- Provides a BRI or Primary Rate Interface

(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.

Note:

For Basic Rate Interface (BRI) service, you need a network terminator 1

(NT1) to connect to an ISDN network. The router’s ISDN/BRI adapter module

does not include an internal NT1, so you or your service provider must supply it.

For the ARN

™

, the ISDN/BRI S/T adapter module does not have an NT1, so you

or your service provider must supply it. The ARN ISDN/BRI U adapter module

has the NT1 built in.

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