Avaya Configuring Dial Services Uživatelský manuál stáhnout pdf (Strana 46)

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101

Configuring Dial Services

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308621-14.00 Rev 00

For V.25bis calls, the router redials the same phone number until its retry attempts

reach the maximum retry count that you specify in the modem parameters. If the

router cannot make a connection using the current phone number, it tries the next

number in its phone list. It continues trying until it has gone through all of the

numbers or it connects successfully.

For ISDN calls, the router sends a call setup message for each number in the

phone list. If the router cannot make a connection using the current phone number,

it tries the next number in its phone list. It continues trying until it has tried all of

the numbers or it connects successfully.

Terminating the Backup Connection

The router terminates the backup circuit after it restores the primary circuit, the

backup circuit fails, or the configured time period for the backup circuit has

expired. After the router restores the primary circuit, it verifies that the backup

circuit is no longer active. If the backup is still active, the router terminates it.

Backup Circuit Protocols

When you select PPP or frame relay as the protocol for the backup circuit, you

determine whether the router performs circuit backup or link backup.

Circuit backup is a point-to-point backup connection. One circuit is backed up at a

time, instead of an entire interface. When you back up a point-to-point primary

circuit (Standard, PPP, or a single frame relay PVC), the protocol for the backup

circuit is PPP.

Figures 1-6

and 1-7 show examples of circuit backup. Figure 1-6 shows a

Standard primary circuit aided by a PPP backup circuit. Figure 1-7

shows a PPP

primary circuit aided by a PPP backup circuit.

Note:

For circuit backup of a single frame relay PVC, the backup line passes

through the PSTN network only, bypassing the frame relay network.

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