Avaya Configuring Dial Services Bedienungsanleitung Seite 43

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Dial Services Overview
114062 Rev. A 1-13
A-bit notification (Single Frame Relay PVC primary/PPP backup)
If only one Frame Relay PVC is being backed up by PPP, the router performs
circuit backup. For circuit backup, the Frame Relay service provider must
support A-bit notification, which tells the router the status of the PVC. This
enables the router to back up the PVC if it fails. Without A-bit notification,
the remote end of the PVC is never notified when the local-side PVC has
terminated, making backup support impossible.
Backup Lines and Pools
Backup lines provide an alternative line to carry data if the primary line fails. It is
advantageous, therefore, to have one or more backup lines to ensure data
transmission. To assign one or more backup lines to a primary line, you establish a
backup pool.
A backup pool is a collection of lines the primary circuits can use. Each backup
pool is identified by a backup pool ID.
The lines in a backup pool can reside in any slot on the router that supports WAN
lines. This means the pool can span multiple slots. Lines in a pool connect to a
modem or directly to an ISDN network (using a router with integral ISDN
capability).
You may combine asynchronous, synchronous, and ISDN interfaces in a single
pool. The asynchronous and synchronous interfaces may use Raise DTR or
V.25bis signaling, while the ISDN lines use ISDN signaling.
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