Paradyne COMSPHERE 3615 - Manual (Page 51)

Operating the DSU
4-7 3615-A2-GB20-20 December 1996
Terminal Power
Terminal Power (TPwr) displays the status of the
EIA-232 or V.35 interface (connector). The DSU checks
the state of the RTS lead to determine when the DTE is
ON to report the following:
•
When the voltage is approximately less than –3V or
greater than +3V for both the EIA-232 and V.35
interfaces.
— If power is detected, the second line displays
On.
— If 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 point-to-point circuit operating at
56 kbps or below. Appendix E shows some typical
DualFlow configurations.
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 point-to-point circuit, it is best that only one
end performs automatic backup. It is possible to
trigger the backup for single-direction network
failures only detected at the remote DSU. The
remote DSU must have RTS Control set to FrcOn.