Telephone mode, function with code 523 - GF82.85-P-2007SKB

MODEL 171.4 with CODE (523) MB Audio 20 radio

Fig 1: Telephone Mode Function Chart

Courtesy of MERCEDES-BENZ USA

Schematic representation of the radio (A2) with code (388) "portable CTEL" UPCI system telephone

With the UPCI (Universal Portable CTEL Interface) control unit (N123/1) it is possible to operate portable CTELs (A34/6) of different manufacturers (Siemens, Motorola, Nokia) in the vehicle. The system that is installed in the vehicle is capable of communicating with different portable CTELs (A34/6). It is only necessary to plug the UPCI portable CTEL holder (Universal Portable CTEL Interface) (A34/15) that is required for each portable CTEL (A34/6) into the Universal Portable CTEL Interface contact plate.

Telephone operation

The telephone system can be operated as follows:

Direct at radio (A2)
With the multifunction steering wheel in combination with the multifunction display at the top (A1p12) of the instrument cluster (A1)

Function

After the request via the operating unit, the telephone radio signals are transmitted and received using the rod antenna (A28).

These signals are transmitted to the UPCI (Universal Portable CTEL Interface) control unit (N123/1) via the E-net compensator (A28/3). The E-net compensator (A28/10) has the task of compensating for losses caused by the higher transmission frequency of the E-net by means of amplification. The telephone is illustrated by a symbol, if it is operational, in the display of the radio (A2). The reception field strength of the telephone after plugging it into the UPCI portable CTEL holder (Universal Portable CTEL Interface) (A34/15) is also displayed.

All control signals and useful signals (e.g. sound signals with hands-free system activated) are transmitted via the Media Oriented System Transport (MOST).

To communicate with the MOST subscribers, the portable CTEL (A34/6) requires an interface, the UPCI (Universal Portable CTEL Interface) control unit (N123/1).

The volume can be adjusted separately for the telephone mode.

The battery of the portable CTEL (A34/6) is charged using the UPCI (Universal Portable CTEL Interface) control unit (N123/1).

The battery is charged automatically as soon as the UPCI (Universal Portable CTEL Interface) control unit (N123/1) is active; and this irrespective of whether the portable CTEL (A34/6) is switched on or off. The radio (A2) has the following telephone functions:

Automatic disabling of telephone card when the Personal Identification Number is entered incorrectly 3 times.
Direct dialing of the telephone number via the numerical keypad, display of the name of the person called (if the number entered is known)
Speed dial: The first 10 memory locations can be dialed by pressing one key only or all other memory locations can be dialed by entering the 3-digit memory location number
Selection from memory lists, sorted according to:
Memory location numbers
Names (alphabetic)
List of previous 10 dialed numbers
Display of caller's number (if the number is also transmitted)
Display of name (if number is known)
SMS reading
Telephone book processing
Note book toggling

Telephone variants

The following variants for model 171 are available for selection:

Code (386) preinstallation for "portable CTEL" UPCI system telephone
Code (388) "portable CTEL" UPCI system telephone Code (273)
Code (273) telephone preinstallation for D-network portable CTEL

Handsfree mode

During a phone call it must be possible for the user to hold the conversation via the hands-free system. For this the hands-free system microphone (B25) is located in the overhead control panel control unit (N70). From there the microphone signals are sent straight to the UPCI (Universal Portable CTEL Interface) control unit (N123/1), digitized, and transmitted to the radio (A2) via the MOST.

The signals are processed again in the radio (A2) and sent to the vehicle speakers. Hands-free conversation is controlled by pressing the "Micro On and Micro Off" button on the operating unit. During a hands-free telephone call the audio source is automatically muted. Operation can only take place via the multifunction steering wheel or the radio (A2).

By taking the portable CTEL (A34/6) out of the UPCI portable CTEL holder (Universal Portable CTEL Interface) (A34/15) private mode is not possible.

Create SMS Process SMS

In the basic service menu the "Mail" button leads to the creation, dispatch and administration of text messages (short message service - SMS).

There are the following options:

Call up mail inbox
Call up mail outbox
Call up mail draft
Create new messages
Perform mail adjustments

The characters are entered using the entry aid or via the 12-key keyboard. These functions are also used for sending SMS messages; a receiver can be specified or dialed from the telephone book.

Data safety, SMS buffer

When the power supply fails, the characters stored in the buffer are saved. However, it is possible for up to 4 characters to be lost. When switched off in a controlled manner, no characters are lost.

UPCI control unit (Universal Portable CTEL Interface), location/task

"Portable CTEL" telephone with code (388) Universal Portable CTEL Interface system

GF82.70-P-5100SK