Avaya Configuring Dial Services Uživatelský manuál stáhnout pdf (Strana 126)

Configuring Dial Services

5-12

117353-B Rev. 00

BRI Subaddresses

The ITU-T specifies that one S/T interface can have eight different TE devices, for

example, routers. However, the service provider may assign only one phone

number for the customer side of the local loop. To determine the specific

destination of the call, the router uses a subaddress.

Each router has an assigned subaddress for which it will accept calls. The

subaddress must be part of the incoming call setup message sent to the router.

Based on the subaddress, the router determines if it is the intended receiver. If not,

the router ignores the call.

Floating B Option for the AN and ANH

If your ISDN service provider only offers 2B + D service, the floating B option for

the AN and ANH enables you to use only one B channel for dial service

applications. Floating B is an alternative if you cannot purchase 1B + D service.

If your service provider offered only 2B + D service, the AN and ANH CPU

would use two of its four serial communications controllers (SCCs) for the two B

channels, one SCC for the Ethernet link, and one SCC for a synchronous link.

Using the floating B option, you use only one B channel at a time, freeing up an

SCC for an additional synchronous link.

You can use floating B if your network integrates an ISDN dial backup connection

with network devices that send protocol traffic such as SDLC or X.25. This type

of application requires the following interfaces:

• One synchronous interface for SDLC or X.25 traffic

• One synchronous interface for the primary link to the backbone network

• One ISDN B channel for the dial backup link

If you use 2B + D service without configuring floating B, the AN provides only

one synchronous interface, so you cannot integrate the dial service with other

network applications. However, by configuring floating B, you can configure two

synchronous interfaces: one Ethernet link and one B channel. The router software

maps whichever B channel is in use to a single SCC.

To implement the floating B option, select Dialup - Floating B for the Port

Application Mode parameter (refer to Chapter 9). The router makes the necessary

adjustments so that only one B channel is available.

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Avaya Configuring Dial Services Uživatelský manuál Strana 126