4.0 General Operation and Special Features

4.3.1AUTODIAL BACKUP

The Modem automatically dials the stored number to connect over the backup line if it detects poor signal quality (ER) or a loss of carrier detect (CD) on the leased line. The criteria used by the Modem in assessing the condition of the leased line depend upon the settings of the Signal Quality option (one error in 103 or 105 bits) and the Carrier Detect Level option (-43,

-33 or -26 dBm).

When Dial Backup occurs (either automatically or by operator intervention), the following message flashes on the front-panel LCD of both modems:

ATTENTION:

DIAL BACKUP

1

2

3

The message clears when the modem returns to the leased line. If you want to clear the message while the Modem is still in dial-backup mode, press the ENT pushbutton.

4.3.2EXIT FROM LEASED LINE AUTO-RECOVERY

If the Leased Line Auto-Recovery Return option is enabled (see below), the Modem automatically exits the Auto-Recovery mode when leased-line conditions are satisfactory. Any normal disconnects (such as loss of carrier or line current) may also disconnect the dial connections and return communication to the leased line. To ensure the proper disconnect capabilities for Leased Line Auto-Recovery mode, both the line current disconnect (CURRENT DISC’T screen) and carrier disconnect (CARRIER DISC’T) options must be enabled on both modems. To manually exit the Leased Line Auto-Recovery mode and return to leased line operation, select DIAL from MAIN MENU screen 1, and then select HANGUP from the AUTO-DIAL screen.

4.3.3LEASED LINE AUTO-RECOVERY OPTIONS

Three options allow you to specify the criteria the Modem uses in determining when to enter and exit the Leased Line Auto-Recovery mode:

Leased Line Auto-Recovery Select (Select)

Return From Leased Line Auto-Recovery (retn)

Test Interval (Test)

The Leased Line Auto-Recovery Select option determines the type of Leased Line Auto-Recovery desired. “DIAL IF BAD >> (1, 2, 3 or 4) min” means dial backup occurs if bad line conditions are present for the number of minutes selected. To disable Leased Line Auto Recovery, select NO AUTO RECOVERY. A sixth option, Manual Recovery, is discussed below.

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Black Box MD885A-R3, MD885AE-R2, MD885C-R2, 34336 user manual Dial Backup

MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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