ADTRAN 1000R Series

Command Reference Guide PPP Interface Configuration Command Set

Technology Review

This technology review provides information regardin g specific dial-backup router behavior (i.e., when the

router will perform dial-backup, where in the configuration the AOS accesses specific routing information,

etc.):

Dialing Out

1. The AOS determines to place an outbound call when either the Layer 1 or Layer 2 has a failure.

2. When placing outbound calls, the AOS matches the number dialed to a PPP interface. This is

accomplished with an ad dition to the dial-backup number command (refer to dial-backup number

<digits> [analog | digital-56k | digital 64k] <isdn min chan> <isdn max chan> <interface> on page

1057).

3. When placing the call, the AOS uses the configuration of the related PPP interface for authentication

and IP negotiation.

4. If the call fails to connect on the first number dialed, the AOS places a call to the second number if

configured. The second number to be dialed references a separate PPP interface.

Dialing In

1. The AOS receives an inbound call on a physical interface.

2. Caller ID is used to match the dial-backup number command to the configured PPP interface.

3. If a match is found, the call connects and the AOS pulls down the primary connection if it is not already

in a down sta te.

4. If no match is found from Caller ID, the call is terminated.