DETEWE OpenCom 510, User Manual

Page: 33 / 164

31
Installation Power Failure
Power Failure
In the event of a power failure, the
system memory will retain all data
(program and user data) without
any changes.
The internal clock will continue to
run for 24 hours. If the power failure
lasts longer than 24 hours, the time
and date will be reset to the factory
setting when power is switched on
again, and updated (by means of a
signal from the exchange) after the
first external outgoing call.
With multi-terminal access configu-
rations, the OpenCom 510 provides
an emergency service feature: In the
event of a power failure, the S
0
1 in-
terface will be switched to the S
0
8
interface, enabling you to make calls
through a connected terminal.
The following is required to enable
emergency service:
■
An MX+S01-8 interface card
must be installed.
■
The power failure circuit of this
interface card must be activated.
To do so, set DIP switches S17 to
S20 to “ON”. The interface card is
delivered with the power failure
circuit deactivated (default: off).
■
Port S
0
1 must be connected to
an NTBA (multi-terminal access)
and configured as an external
connection.
■
Port S
0
8 must be configured as
an internal connection. An ISDN
telephone with emergency serv-
ice capability must be connected
to this port.
Note: Emergency service is not pos-
sible with system access configura-
tions.
Testing the Power Failure Circuit
You can test the configuration as fol-
lows:
1. Disconnect the OpenCom 510
from the mains supply (see in-
structions in
Installing the Cen-
tral Control Module starting on
page 23, steps 1 to 3).
2. Disconnect the NTBA from the
mains supply.
3. It should now be possible to
make external calls through the
ISDN telephone connected to
port S
0
8.