| Pin |
Name |
Description |
| 1 |
GND |
Digital ground |
| 2 |
MIC/JCONN |
External audio input from accessories or handsfree microphone. Multiplexed with junction box connection control signal |
| 3 |
AGND |
Analogue ground for accessories |
| 4 |
TDA |
Transmitted DBUS data to the accessories |
| 5 |
M2BUS |
Serial Bidirectional data and control between the handportable and accessories |
| 6 |
HOOK/RXD2 |
Hook indication. HP has a 100KE pull-up resistor |
| 7 |
PHFS/TXD2 |
Handsfree device power on/off, data to flash programming device |
| 8 |
VCHAR |
Battery charging voltage |
| 9 |
GND |
Digital ground |
| 10 |
EAR/HFPWR |
External Audio output to accessories or handsfree speaker |
| 11 |
DSYNC |
DBUS data bit sync clock |
| 12 |
RDA |
DBUS recieved data from the accessories |
| 13 |
BENA |
Power supply to headset adapter |
| 14 |
VF |
Programming voltage for FLASH |
| 15 |
DCLK |
DBUS data clock |
| 16 |
VCHAR |
Battery charging voltage |