Chapter 43: Backup Interface-Isdn; Isdn As Primary Interface; Configuring Isdn As A 128Kbps Primary Interface - Avaya 1000 Series Configuration Manual

Chapter 43: Backup Interface-ISDN

1000-series routers support an ISDN (Integrated Services Digital Network) interface that functions as a
backup interface. The advantage of this design is to provide an alternate WAN interface in the event that
the T1/E1 leased line WAN interfaces are down. Dial-up ISDN is an established broadband technology
that can be configured as a secondary connection (while the primary connections are down) to support
small to medium sized remote site connections to enterprise locations as well as general Internet
connectivity for groups of from 25 to 250 users.
ISDN configured with a BRI interface supports two 64 Kbps channels or one 128Kbps connection. ISDN
supports standard networking protocols such as Network Address Translation (NAT), PAP/CHAP, and
PPP/MLPPP (for 128 Kbps channel configurations). ISDN supports dial on demand and bandwidth on
demand capability.

ISDN as Primary Interface

ISDN interface can be used as Primary interface, similar to T1/E1 links with encapsulation of
PPP or MLPPP. The bundle can consist of single BRI channel or two channels. Once the call is
established & (ML) PPP negotiations are successful, the data can be transmitted similar to any
other interface.

Configuring ISDN as a 128Kbps Primary Interface

The network topology map show below is used for this configuration.
To configure the ISDN interface as the primary 128Kbps interface:
Avaya Secure Router 1000 Series Configuration Guide December 2010 273