Pin Function Description Default
6 REAR_D - GCAI PIN 4: USB D -, GPIO_2 (Shared with
the front MMP)
Disabled
7 REAR_D + GCAI PIN 8: USB D +, GPIO_1 (Shared with
the front MMP)
Disabled
8 GPIO_0 GCAI PIN 10: GPIO Input: GCAI detec-
tion / Select Line
9 VBUS_2 Second USB 5 V Supply Disabled
10 TX 4-wire RS232 TX
11 RX 4-wire RS232 RX
12 MIC_REAR_2 Second Microphone Input (MIC_REAR_2),
Nominal sensitivity 80 mV rms, Bias voltage
9.3 V
Disabled
13 GND Ground
14 GPIO_5 NGCH GPIO1 (CPS configurable) Disabled
15 GPI_7 4-Level Analog Input Enabled
16 1_WIRE GCAI PIN 1: Bi-directional Serial Bus Disabled
17 HANDSET GCAI PIN 3: Handset Audio Output Parallel to front GCAI
18 GND GCAI PIN 5: Ground
19 MIC_REAR_1 External Microphone Input (MIC_REAR_1),
Connected to GCAI PIN 7, Nominal sensitivi-
ty 80mVrms Bias voltage 9.3 V (Ground PIN
8 to activate)
Disabled
20 GPIO_4 GCAI PIN 9: GPIO Hook Input
21 USB_D + Second USB D +
22 USB_D - Second USB D -
23 RTS 4-wire RS232 RTS
24 CTS 4-wire RS232 CTS
25 PWR_ON Enhanced Control Head Power On Input
68015000553-KC
Chapter 5: Connectors and PIN Assignment
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