Handset; Compensator - Motorola V60 Series Manual

Class (BR220), CL-Class (BR215) and Maybach (BR240). The CP module for the telephone package
contains the PSE box supporting the software and associated electronics for the integration of the handset
to the vehicle. The CP module also contains the Tele-Aid module supporting the emergency notification
system in the vehicle.
1.3.3C Multiple Handset Interface Module (MHI)
MHI was introduced on the MY2005 vehicles across all chassis except for Maybach, which still utilizes
the CP module. The MHI module is similar to the PSE module in that it supports the portable phone's
initial integration for the telephone package into the vehicle system, but communicates using the MOST
vehicle bus instead of the D2B vehicle bus. The MHI system is designed to be forwards-compatible with
future portable phones (the user only needs to change the cradle in order to upgrade to new portables in
the future). The MHI also has integrated software to perform the Hands-free Audio function, such that the
Microphone Array Module from AKG is no longer required to be part of the system.

1.3.4 Handset

A Motorola Digital handset is used for the telephone system. Although the Digital handset is available as
a portable phone sold separately by various vendors, it will not interface with the Mercedes-Benz vehicle.
Only handsets that are part of the telephone package will interface with the Mercedes-Benz vehicle. They
can also be used as a portable cellular phone when not interfacing with the vehicle. The three types of
handsets available for the telephone package are digital TDMA, CDMA or GSM, which will be
determined by the customer and/or carrier availability. Refer to section 1.2.1 and 1.2.2 of this manual and
the appropriate user manual for a full description of each handset and a detailed explanation of CDMA,
TDMA and GSM technologies. The customer will have the option to purchase more than one handset
that can also be integrated with the same vehicle, but only one handset can be integrated at any time.

1.3.5 Compensator

The compensator is used to "compensate" for the small amount of power that is lost as a result of the
extra RF cable needed to send or receive the signal through the vehicles antenna. The compensator is not
a booster when in digital or analog modes. Refer to section 4 for a complete layout and description of the
RF path, which includes the compensator.
The voice activation feature interfaces with the telephone package. It is treated as a separate system and
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is not covered in this manual.
Mercedes Benz Technical Manual for Telephone v4.6
1.0 General Section
Date: 09/01/2004