Подскажите назначения контактов разъема RJ45 под микрофон. 8 контактов.

Ware, спасибо.

первый контакт на схеме Ware показан, обычно слева, если защелка вверх.

Microphone Jack Pinout GM300
When looking at the front of the radio pin 1 is at the top, nearest to the volume control.

Pin # Description
1 - On the low band, high band, UHF and 800 radios this pin is unused, but fed to the logic board. On 900 MHz radios this pin is unused but never leaves the front panel board. See Note 1.
2 - On the low band, high band, UHF and 800 radios this pin is unused, but fed to the logic board. On 900 MHz radios this pin is unused but never leaves the front panel board. See Note 1.
3 - When this pin is floating the receiver is in carrier squelch, and when this pin is grounded (if the channel has PL or DPL programmed) the receiver must have the proper PL or DPL to unsquelch it. The method of grounding this pin varies with the type and model of microphone.
4 - Ground
5 - Microphone audio and preamp DC bias.
6 - PTT (ground to transmit).
7 - SCI+ (bidirectional programming lead - used by the RIB for programming the radio - leave this pin floating in the microphone).
8 - Fixed level receive audio out (intended for a handset earpiece). This audio is not affected by the volume control and works well as de-emphasized repeat audio.
Notes:
1: On the low band, high band, UHF and 800 MHz radios, the microphone jack pins 1 & 2 run through the internal cable to spare pins on the logic board where they sit unused as spares. On the 900 MHz board (with HearClear), these pins are not attached to anything on the board (solder pads only) as the two leads are used to provide +9.6V and enable/disable signals for the HearClear hybrid module located on the microphone jack / volume control circuit board. In the 900MHz radio there is one unused lead in the cable between the logic board and the microphone jack / volume control circuit board and could be wired to pin 1 or 2 of the microphone jack and used for other purposes, such as providing a COR signal to the outside world. On low band, high band, UHF or 800MHz radios this lead was used to provide the headset audio to pin 8 of the microphone jack through a 560 ohm resistor located on the logic board. On 900 MHz radios the headset audio is optained at the output of the HearClear hybrid module that's already on the microphone jack / volume control circuit board, so they put the 560 ohm resistor there and freed up a signal pin on the logic board.