General Section; Purpose; Introduction To The Telephone Package (Motorola Digital Phone); Cdma, Tdma And Gsm Protocols - Motorola V60 Series Manual

1.1

Purpose

This manual was written to familiarize the Mercedes-Benz Service Technician with the telephone
system designed by Motorola for Mercedes-Benz MY00 thru MY05 vehicles. It is recommended that
this training manual be reviewed prior to performing the installation of the telephone package. This
document is not an installation guide or procedure, a separate Mercedes-Benz manual has been created
for that purpose. However, basic troubleshooting charts are included as a part of this document to assist
in correcting problems that may occur.

1.2 Introduction to the Telephone Package (Motorola Digital Phone)

Prior telephone systems that have been installed in Mercedes-Benz vehicles have used only 800MHz
analog technology. The MY00 uses the 800MHz analog/digital and MY01/05 uses 1900MHz digital in
addition to 800MHz analog/digital. MY00 thru MY04 telephone packages use CDMA or TDMA
protocols and, MY05 vehicles offer the option of GSM as a third protocol depending on the model
selected for installation, which will be determined by the customer and/or carrier availability.
Additionally, the telephone package has the ability to automatically default to an analog signal if a
digital signal is not available, or is too weak to provide a quality conversation.
The telephone package allows calls to be made and received without taking your eyes off the road or
your hands off the steering wheel. This is accomplished by integrating the phone with the
multifunction controls located on the sides of the steering wheel (if equipped) and through Voice
Recognition (if equipped). Displays on the MCS, Audio 30 or COMAND relay information, such as,
numbers stored in the handset's memory, signal strength, etc. Refer to the K2OPTION owner's manual
for details on the various features of this system.

1.2.1 CDMA, TDMA and GSM Protocols

CDMA is an acronym for Code Division Multiple Access. It is one of several methods of providing
digital cellular service. CDMA imposes several digital signal patterns, one pattern per conversation,
on a single carrier frequency. The communication link (conversation) is kept separated from other
links by the ability of the telephone to only recognize its assigned signaling pattern (code). CDMA
technology is popular because it provides for a large number of communication links on a single
carrier frequency, but one of its drawbacks is that as more links are established, distortion and
interference increases.
TDMA stands for Time Division Multiple Access, and is another method of providing digital cellular
service with multiple links (conversations) on the same carrier frequency. It differs from CDMA in that it
uses slots of time for each link. Each time slot repeats continuously at a predetermined rate or speed.
Samples of each link are taken at the same rate and mixed with the carrier frequency, each in its turn. On
the receiving end, the receiver selects the data from the time slots of the assigned communication link,
Mercedes Benz Technical Manual for Telephone v4.6

1.0 General Section

Date: 09/01/2004