Telephone mode, function

Vehicle speakers

X11/4

Navigation computer

A35/11

A34/4

A34/6

A2/13

A2/22

(A2/49a1)

A1

Diagnosis

Radio Tuner

Traffic data recorder

Audio signal processing

B25

CD drive

Central computer

A40/3

D2B

CAN-B

MFL

N73

CAN-B

A28/3

Block diagram of COMAND telephone system,

Illustrated on the following equipment specification:

 Code (854) MB portable CTEL (D2B)

 Code (810) Sound system

 Code (813) voice control system (VCS)

D2B Digital data bus

MFL Multifunction steering wheel

A1 Instrument cluster

A2/13 Sound amplifier

A35/11 Voice control system control unit

A40/3 COMAND operating, display and control unit

B25 Hands-free system microphone

N73 DI control unit

X11/4 Data link connector

A2/22 Telephone antenna (valid for models 209 and 203 as from 1.7.02)

A2/49A1 Telephone antenna (valid for model 209 up to 30.6.02)

A28/3 E-network compensator

A34/4 CTEL interface

A34/6 Portable CTEL

The telephone system can be operated as follows:

 on the COMAND operating, display and control unit (A40/3)

 using the multifunction steering wheel (MFL) in combination with the multifunction display at the top (A1p13) of the instrument cluster (A1)

 with code (813) voice control system (VCS) using voice commands

The audio source is automatically muted during a telephone call. Different types of telephones are available
(e.g. portable CTEL, permanently installed telephone, version in combination with TELE AID).

The portable CTEL telephone variants with code (317) D-net portable CTEL (D2B) and code (854) MB portable CTEL variants are described in detail below.

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The telephone radio signals are sent and received over the telephone antenna (A2/22) (telephone antenna (A2/49a1) for model 203 up to 30.6.02). The display of the COMAND operating, display and control unit (A40/3) shows when the telephone is in its ready status the destination field strengths in 5 grades. All control and wanted signals (e.g. audio signals from activated hands-free system) are transferred via the digital data bus (D2B) .

The portable CTEL (A34/6) requires here an interface to the D2B, which is realized by the telephone interface (A34/4).

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The COMAND operating, display and control unit (A40/3) has the following telephone functions at its disposal:

 Automatic disabling of telephone card when the Personal Identification Number is incorrectly entered 3 times in a row.

 An emergency call (911) can be made without any PIN or when the telephone card is not inserted.

 Direct dialing of the telephone number using the knob or number pad, display of name of party being called (when 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

 Select from memory list, sorted according to:
-memory location numbers
-names (alphabetic)
-list of 10 last dialed numbers

 Display of the call number during an incoming call (in the event that the number is also transmitted by radio signal), display of the caller's name (where number is known).

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SMS text messages

Status up to 31.5.01:

 SMS reading

 Delete SMS

Extension as from 1.6.01:

 Create SMS

 Edit SMS

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.

Create SMS /edit SMS are possible only when SMS messages are present in the buffer. Characters are entered with the input aid (Speller) or using the keypad (same as for portable CTEL). These functions are also used for sending SMS messages; a receiver can be specified or dialed from the telephone book.

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Switching back on controlled/uncontrolled

After switching back on, the basic telephone display appears. By selecting menu point "SMS" the main SMS menu can be displayed. In the SMS main menu, select "Edit SMS" and continue the editing process using the entry aid (Speller).

 For model 203 as from 1.7.02 the telephone's notebook will always be available.

Telephone variants

For the COMAND operating, display and control unit (A40/3) the following variants are available for telephone operation:

 With code (852) portable CTEL preinstallation complete on dome (with telephone interface (A34/4) and E-net compensator (A28/3)

 With code (854) MB portable CTEL (with telephone interface (A34/4) and E-net compensator (A28/3) and portable CTEL (A34/6))

 With code (853) MB Standard telephone (with telephone transmitter/receiver, D2B (A35/13) and telephone handset (A34))

 With code (855) TELE AID (with telephone transmitter/receiver and TELE AID, D2B (A35/17) and telephone handset (A34))

 The telephone interface (A34/4) is from the same manufacturer as the portable CTEL (A34/6). It realizes the physical connection of the mobile phone to the D2B system as well as the protocol conversion as per the specification.