Operating the DSU
Terminal Power
Terminal Power (TPwr) displays the status of the
•When the voltage is approximately less than ±3V or greater than +3V for both the
ÐIf power is detected, the second line displays On.
ÐIf no power is detected, the second line displays Off.
Backup Branch
The Backup (Bckup) branch controls dial backup operation. The following sections explain dial backup operation.
Dial Backup Operation
The DualFlow DSU with dial backup capability can provide backup for a
Backup is controlled primarily by software configuration options in the DBM, DBM Port, and Backup option sets. The unit can be configured so that backup can be either automatic or manual. Manual backup can be controlled from either the DSU's control panel, or a 6700 or 6800 Series NMS.
Backup begins with configuring the unit.
Configuring the Unit for Dial Backup
The following configuration options should be set, whether initiating backup manually or automatically.
DBM Option Set:
•AutoAnswer ± Select Enab.
When enabled, this option set allows the DBM to answer an incoming call. (Enab is the factory- loaded default setting.)
•Call Setup ± Set call setup security level:
None ± No call setup security is required. (None is the default.)
Password ± Originating and receiving DBMs exchange passwords before the DBMs can complete the connection. There must be an incoming password (RxPwd) and an outgoing password (TxPwd) set up. Select Pswrd when the DiDg application configuration is being used.
Callback ± Both DBMs must exchange passwords and a Backup Directory pointer must be sent before a call can be initiated. There must be an incoming password (RxPwd) and an outgoing password (TxPwd) set up, and the originator's local telephone number (Phone subbranch) must be stored in the answering DBM's Backup Directory.
Alarm ± No security is to be used at the control DBM, and the DBM only answers incoming calls when there is a facility alarm.
If the control DSU is to initiate the call, set the control for Pswrd and the tributary for Cllbk.
If the tributary DSU is to initiate the call, set the control for Cllbk and the tributary for Pswrd.
Backup Option Set (none of these need to be set for manual backup):
•Auto Bckup ± Select Enab.
When enabled, the DSU will automatically initiate dial backup when the DDS line is down. Up to 10 attempts will be made.
If both the control and tributary DSUs are configured for automatic backup, NtwkTimOut should be set to different values so that the control and tributary DSUs do not try to place a call at the same time.
On a
December 1996 |
