Connector pin-outs

AUDIO OUT, XLR male 3-pin terminals (CH1 to CH5)
Pin	Description	Schematic
1	ground
2	+ audio
3	– audio
Shell	ground

 

AUDIO OUT, 3.5 mm, 3-pole, jack
Component	Description	Schematic
Sleeve	– audio
Ring	– audio
Tip	+ audio

 

AUDIO IN, XLR female 3-pin terminal
Pin	Description	Schematic
1	ground
2	+ audio
3	– audio
Shell	ground

 

AUDIO IN, 3.5 mm, 3-pole, jack
Component	Description	Schematic
Sleeve	– audio
Ring	– audio
Tip	+ audio

 

PTT 25-pin, male, D connector
Pin	Description	Pin	Description	Schematic
1	PTT1 normally closed contact	14	PTT1 common
2	PTT1 normally open contact	15	ground
3	PTT2 normally closed contact	16	PTT2 common
4	PTT2 normally open contact	17	ground
5	PTT3 normally closed contact	18	PTT3 common
6	PTT3 normally open contact	19	ground
7	PTT4 normally closed contact	20	PTT4 common
8	PTT4 normally open contact	21	ground
9	PTT5 normally closed contact	22	PTT5 common
10	PTT5 normally open contact	23	ground
11	AUX_IN +	24	AUX_IN –
12	+5 VDC	25	+5 VDC
13	+5 VDC	shell	ground

 

LIGHTS, 4-way screw terminal strip
Terminal	Description	Schematic
1	ground
2	Normally open contact
3	Contact common
4	Normally closed contact

 

Redundant 9-pin, male D connector
Pin	Description	Pin	Description	Schematic
1	No connection	6	No connection
2	No connection	7	No connection
3	Redundant in	8	No connection
4	Redundant out	9	No connection
5	ground	shell	ground

 

Chassis main power inlet IEC C14
Pin	Description	Schematic
L	live phase
N	neutral phase
E	protective earth

 

11-24VDC screw terminal strip
Terminal	Description	Schematic
G	ground (0 V)
12V	11 to 24 VDC

 

MIC PTT
Component	Description	Schematic
Sleeve	ground
Ring	Microphone audio + bias voltage
Tip	Switch closure compatible input for microphone PTT switch

 

HANDSET socket
4 Pin RJ11	6-4 Pin RJ12	Description	Schematic
1	2	(Black) microphone +
2	3	(Red) speaker –
3	4	(Green) speaker +
4	5	(Yellow) microphone –

 

VOICE modem socket
4 Pin RJ11	6-4 Pin RJ12	Description	Schematic
1	2
2	3	Ring line 1
3	4	Tip line 1
4	5