5Emergency operation

5.1Emergency operation switch

Emergency operation commences in the event of a power failure. Connected to an NTBA in the emergency mode, the S0 bus can only power a terminal that is capable of emergency operation. If you are operating several terminals on the bus, the emergency mode must only be activated on one of the terminals.

Switching to the emergency mode

Remove all plugs from the terminal.

Take a screw driver and turn the switch to position 1.

Mark this terminal as the emergency terminal

Note:

When delivered, your telephone is not set to emergency operation.

1

2

1

2

Switch setting

1

2

Emergency operation possible

Emergency operation not possible

5.2In an emergency

If the power supply on your NTBA should fail, only the terminal set to the emergency mode will operate on the bus. All calls for the bus will be signalled at this one telephone. When you are making telephone calls, the emergency mode is indicated by a "!" between the date and the time on the display.

SmartLine D721:

The analog port is not available during emergency operation.

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Philips D721, D711 manual Emergency operation