Motorola 3 wire Handset Protocol 4800x car phone

Other Hardware Device Hacking
1

Hi,
Does anyone have any information on the 3 wire protocol found in old Motorla Carphone Handset like the 4800x

I can fine online the pinout of the handset RJ45 connector.

  1. BLUE - Handset Logic Ground
  2. RED - +9.5 VDC
  3. PURPLE - T-DATA, 3-Wire Databus "True"
  4. ORANGE - C-DATA, 3-Wire Databus "Complimentary"
  5. YELLOW - R-DATA, 3-Wire Databus "Return"
  6. BROWN - Handset Audio Ground
  7. GREEN - No Connection
  8. WHITE - Receive Audio to Handset

No detail is availble about the protocol, signaling, command etc.

Might have to use a logic analyser to see if i can figure it out.

Just wondered if anyone has explored this to save reinventing the wheel.

Thanks

2

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