Interface Telephone/Top Hifi

BIT 2 With CKPH (GSM and WDCT networks)

BIT 2 with CKPH (GSM and WDCT networks)
The Siemens CKPH (cordless keypad handset) is connected via a WDCT antenna to the BIT 2. Data communication with the vehicle electrical system takes place via the I/K-bus interface. This enables operation via the on-board monitor, MID and multifunction steering wheel. Hands-free operation is effected by means of a microphone and the existing audio system, radio, DSP or double-coil speakers. Other audio sources are deactivated by the control module during hands-free operation.

Reception and relaying of SMS messages is possible. These text displays can be read off in the CKPH1 and CKPH2 and in the on-board monitor and MID. A personal telephone directory can be stored on the SIM card.

Long-distance data or fax transmissions can also be effected with a separate connection.

Brief description of components
The Siemens telephone with CKPH (fixed mounting) consists of the following components:
- CKPH (cordless keypad handset)
- Eject box with card reader
- Basic Interface Telephone
- Hands-free microphone
- Double-coil speakers
- Antennas

CKPH (cordless keypad handset)
The cordless keypad handset replaces the handset previously supplied with a coiled cable. The cable connection to the eject box is omitted. Communication is conducted by radio and enables more freedom of movement. Calls can thus also be made and received in closer proximity to the vehicle (approx. 10 m).

The eject box is the basic and reception station for the CKPH. In the case of the tandem system option, the second CKPH is accommodated in a second eject box in the center armrest at the rear. The handset can be stowed with the keypad facing upwards or downwards.

Data is transmitted between CKPH and BIT 2 via a WDCT antenna (Worldwide Digital Cordless Telephone antenna (2.46 GHz).

The cordless keypad handset is supplied by a storage battery. The battery is recharged by integrated charging electronics when its capacity drops below 1/3. However, the CKPH must be engaged in the eject box for this purpose. Charging starts only when terminal R is activated.

IMPORTANT: A charging procedure lasting approx. 10 hours is initiated when the storage-battery compartment is opened. This formatting procedure results in an increased closed-circuit current.

CAUTION: Do not charge storage batteries externally.

Eject box with card reader
The eject box serves to accommodate the telephone handset. It contains a voltage regulator and an SIM card reader and is located in the center armrest.

The ISM band (Industrial Science Medical 2.46 GHz) is not authorized in all countries. WDCT operation can be deactivated and activated with a switch in the eject box. With one switch-off operation, the BIT2 control module and the SBDH on the ISM band are deactivated (the WDCT switch is at "0").

With the WDCT switch at "0", the radio link to SBDH is not set up when terminal R is switched on again. The SBDH no longer functions. The telephone unit can only be used without the handset.

The power supply is provided by terminals 30 (+6V) and 31. Terminal 58g supplies the signal for illuminating the CKPH.

Basic Interface Telephone 2
The BIT 2 control module contains the following components:
- I/K-bus interface
- Motor-vehicle interface (audio)
- Microprocessor, program and data memories
- GSM module
- WDCT basic station
- Voltage supply

Data communication with the vehicle electrical system is facilitated by the I/K-bus interface. It is thus possible to operate the phone using the multifunction steering wheel, on-board monitor or MID.

The WDCT basic station has a transmitter power of max. 10 mW and establishes the connection to the CKPH via the WDCT antenna. The transmitter power is modulated as required.

The BIT 2 control module is located in the luggage compartment on the left.

If terminal R or 15 switches to ignition-lock position "0", the phone remains active for a certain run-on time. The run-on time (timer) can be set between 0 and 120 minutes in the phone menu on the handset (refer to Owner's Manual). 0 minutes is set as the standard value.

Hands-free microphone
Hands-free operation is effected by means of a microphone and the existing audio system, radio, DSP or double-coil speakers. Other audio sources are deactivated by the BIT 2 control module during hands-free operation.

Communication is conducted in digital full-duplex transmission, i.e. NF is enabled for both call participants. It is possible to speak and listen simultaneously.

Double-coil speakers
Double-coil speakers are only fitted in conjunction with the hands-free facility. The audio coil is muted during an incoming/outgoing call. The second coil is used for conducting communication.

On cars without DSP, the BIT 2 control module is connected directly to the double-coil speakers. On cars with DSP, the speakers are connected directly to the devices. The double-coil speakers are installed at front right and left.

Antennas
The BIT 2 control module transmits and receives calls from the mobile-telephone network via the GSM antenna. The wide band antenna is designed for a frequency of 900 MHz and consists of two emitters.

Depending on the model, the GSM antenna is fitted at the following locations:

Model Location
E38 Group antenna on outer skin of roof
E39 Window antenna
E39/2 Antenna on outer skin of roof
E46 Antenna on outer skin of roof
E46C Antenna rod
E53 Antenna underneath rear spoiler

The WDCT antenna transmits the communication by radio to the CKPH. The installation location depends on the model and is set out as follows:

Model Installation location
E38 underneath rear parcel shelf
E39 underneath rear parcel shelf
E39/2 (touring) under left side trim panel