Ericsson 250 User Manual
Page 47
OPTIONAL EQUIPMENT
47
BusinessPhone 250 - Basic Telephone
BusinessPhone 50 - Basic Telephone
CONFERENCE UNIT
For conferences with many participants, the conference unit
enhances the speech quality. It provides full duplex and high
quality conversation possibilities.
ALARM
INTERFACE UNIT
This plug-in module is fitted into the bottom of the
telephone. It makes it possible to transfer alarm signals from
various devices via the telephone to the exchange and to a
pre-defined extension. A special circuit layout provides
maximum functional security.
To a telephone fitted with an alarm interface unit you can
connect devices such as bathroom alarms for hotel rooms,
emergency alarms for hospitals, bank security alarms and
supervision of machines.