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COMSPHERE 3550 Series Data Service Units
4-8 February 1995 3550-A2-GB20-10
Table 4-2
Backup Branch Menu Selections
Current
Backup Mode
Backup
Command
Effect
Idle Bkup
Dial
Dial out, establish, and switch to dialed link (Dial Backup mode).
Dial out and establish dialed link (Standby mode). (Data is routed over the DDS
circuit.)
Standby Disc
→Dial
Disconnect dialed link (Idle mode).
Switch data to dialed link (Dial Backup mode).
Dial Backup DrBU
→DDS
Disconnect dialed link and switch to private line (Idle mode).
Switch data to DDS (Standby mode).
External Backup ExtBU If
ExtBU
in the
ExtBU option set is set to Orig, this command is displayed (Idle
mode). Select this command to establish a backup call. When the backup call is
established, the DSU switches data to the dialed link.
DrBU Disconnect dialed link and switch to private line (Dial Backup mode).
Manual Backup
You can control each step of a backup attempt by
following one of these procedures.
Placing a Backup Call
To place a backup call:
Procedure
1. Go to the Bkup option set under the Confg branch
and set Auto Bckup to Disab.
2. Select Bckup (Backup branch) to select a
telephone number from the Backup Directory.
If the telephone number in the Backup Directory is
the number you want to dial, go to Step 5.
3. Select Dial, the Backup Dir screen is displayed
identifying the Backup Directory indicator.
4. Select another telephone number to call:
• Press the F1 key (↑) to increment the directory
indicator (e.g., 1 to 2).
• Press the F2 key (↓) to decrement the indicator
(e.g., 2 to 1).
5. Select Dial (F2); the DBM places the call.
6. Once the dialed call has been established, select
Dial to switch data to the dial path.
Manual DDS Restoration
Data can be switched back to the DDS circuit once
DDS service has been restored.
Procedure
1. From the Bckup branch, select DDS to restore
data traffic to the DDS circuit.
2. If the DDS circuit operates normally after the
switch, select DrBU to drop the backup circuit.
3. If the DDS circuit fails to perform reliably, select
Dial again to quickly route data back over the
dialed connection.
Manual Dial Backup Termination
• If in Standby mode, select Disc.
• If in Dial Backup mode, select DrBU.
• If in External Backup mode, select DrBU.