Avaya Configuring Dial Services Manual de usuario descargar pdf (Pagina 45)

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Dial Services Overview

308621-14.00 Rev 00

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Table 1-3 lists the protocols for each type of primary and backup circuit.

Activating the Backup Line

When the router detects a failure on the primary line, it selects a line from a

backup pool. The router activates a backup line when:

• The primary circuit is not operating.

• All of the primary circuit’s lines have failed.

• An active backup line has failed.

If the backup line itself fails, an inactive backup line can replace it only if you

configure multiple lines in the backup pool. If the first line fails for every

phone number in the router’s phone list, and the primary line is still down, the

router tries the next line in the pool.

If you are backing up a frame relay primary circuit, the router (not the

network) activates and terminates the frame relay backup connection. The

router rejects incoming calls from the frame relay network.

Reestablishing the Backup Connection

If the remote site has several telephone lines attached to individual dial units, the

backup circuit uses the telephone numbers stored in the primary circuit’s record to

connect to the site. If one telephone number fails, the backup line attempts to

connect using one of the other telephone numbers.

Table 1-3. Primary and Backup Circuit Protocols

If the primary circuit’s protocol is The backup circuit’s protocol can be

Standard Async or Sync PPP

PPP Async or Sync PPP

Frame relay -- backing up a service record

with only one PVC (direct mode)

Async or Sync PPP

Frame relay -- backing up the entire frame

relay interface (group mode)

Frame relay only

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