U4 Tandem telephone

Plug connector overview

NumberX-pin, colourDescription
X176718-pin, BlackPlug connector Tandem telephone

Pin assignments at plug connector X1733

PinTypeDescription / Signal typeConnection /
Measuring notes
1ESignal Transceiver/charging electronicsTransceiver/charging electronics
   
2ESignal Transceiver/charging electronicsTransceiver/charging electronics
   
3ESignal Transceiver/charging electronicsTransceiver/charging electronics
   
4ETelephone ON/OFFTransceiver/charging electronics
   
5 Not used 
   
6 Not used 
   
7 Not used 
   
8 Not used 
   
9 Not used 
   
10MVideo shieldShield
   
11 Not used 
   
12 Not used 
   
13 Not used 
   
14 Not used 
   
15ENight light signalRadio
   
16 Not used 
   
17 Not used 
   
18MGroundTransceiver/charging electronics