GF82.95-P-3001Q Selecting Telephone Antenna, Function

GF82.95-P-3001Q Selecting Telephone Antenna, Function
- with CODE (855) TELE AID
- except CODE (498) Japan version
- except CODE (491) USA version


Selecting telephone antenna, function
A GSM (Global System for Mobile Communication) antenna is needed for transmitting the TELE AID emergency call telegram (TELE AID emergency call or telediagnosis), for establishing the voice connection and for conventional phone calls. For normal telephone calls it is the CTEL antenna (A2/22). This antenna can be damaged in the case of an accident (e.g. rollover). However, the telephone antenna (A2/22) can also have another defect. TELE AID emergency call or telediagnosis is no longer possible then. To prevent this from happening, the emergency call system left backup antenna (A2/54) and the emergency call system right backup antenna (A2/55) are installed in addition to the telephone antenna (A2/22). This antenna is located at a crash-safe location and should only be used if required.

For this purpose, the D2B telephone and TELE AID transmitter/ receiver (A35/17) is equipped with 2 GSM antenna inputs to which the corresponding active antenna is switched through to the telephone transmitter/receiver unit. As long as no emergency call is triggered, the CTEL antenna (A2/22) is always active. In the event of an emergency call the CTEL and TELE AID transmitter/ receiver, D2B (A35/17) checks the signal level of the CTEL antenna (A2/22). If this is not sufficient, the level of the emergency call system left backup antenna (A2/54) and emergency call system right backup antenna (A2/55) is checked. The antenna with the higher signal level is used for radio connection.

The telephone transmitter/receiver unit is integrated in the D2B telephone and TELE AID transmitter/receiver (A35/17).