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Accessories
inverted by an open collector transistor before becoming available at two of the con-
nectors.
Power Supply
The Handsfree Unit is able to deliver power to the phone for operation and battery
charging by regulating the +12V of the vehicle battery to a constant current supply
of max. 850mA and less than 1mA during stand-by.
Phone Operation:
The power consumption of the phone in different situations, e.g. in stand-by or in
transmission, is entirely controlled by the phone itself, as these power levels are pro-
grammed and stored in the phone.
Battery Charger:
As the phone battery at all times is provided with current from the HandsFree Unit,
the charging of the battery, incl. trickle charging, is controlled by the phone itself.
For more information regarding the battery charging algorithms of the telephone,
refer to section 2, Technical Description, subsection Battery Charging.
Optional Accessories
Music Mute
An optional Music Mute unit can be connected to the HandsFree Unit and will
direct the amplified received audio signal to the car stereo speakers during the
handsfree conversation.
If the car stereo is equipped with a specific "mute" input, the optional Music Mute
Cable connected directly between this input and the HandsFree Unit will mute the
car stereo during the handsfree conversation.
Note: Max. current load at Music Mute output is 200mA.
Goose-Neck Microphone
A Goose-Neck Microphone allows a more flexible microphone position for
improved sound quality incl. reduction of transmitted noise.
Data Extension
Data communication using handsfree mode is made possible by connecting a Data
Extension Unit between a modem and the Data Communication Connector.
External Handset
An External Handset will give the user the possibility to switch from handsfree to
handheld operation without disconnecting the power source. A Data Extension Unit
is required for the connection between the External Handset and the Data Commu-
nication Connector.
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