COMSPHERE 3550 Series Data Service Units
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| Table | |
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| Backup Branch Menu Selections | |
Current | Backup | Effect | |
Backup Mode | Command | ||
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Idle | Bkup | Dial out, establish, and switch to dialed link (Dial Backup mode). | |
| Dial | Dial out and establish dialed link (Standby mode). (Data is routed over the DDS | |
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| circuit.) | |
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Standby | Disc | Disconnect dialed link (Idle mode). | |
| → Dial | Switch data to dialed link (Dial Backup mode). | |
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Dial Backup | DrBU | Disconnect dialed link and switch to private line (Idle mode). | |
| → DDS | Switch data to DDS (Standby mode). | |
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External Backup | ExtBU | If ExtBU in the ExtBU option set is set to Orig, this command is displayed (Idle | |
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| mode). Select this command to establish a backup call. When the backup call is | |
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| established, the DSU switches data to the dialed link. | |
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| DrBU | Disconnect dialed link and switch to private line (Dial Backup mode). | |
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Manual Backup
You can control each step of a backup attempt by following one of these procedures.
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.
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).
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.
December 1996 |
