Pub. 42004-547A
NEMA 4X VoIP Telephones
Page 10 of 17
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-547A.docx
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Figure 6. Internal PCBA Connections
Auxiliary I/O
Inputs
The telephones have four auxiliary inputs for customer use. Terminate these inputs to terminal block
P12
, on the VoIP Carrier PCBA (see Figure 6). Connect each input between the desired input (
INPUT
1–4
) and common (
GND
) on terminal block
P12
.
Table 4. Auxiliary Inputs—Terminal Block P12
Pin Label Function
1
IN4
Input 4
2
COM
Common
3
IN3
Input 3
4
COM
Common
5
IN2
Input 2
6
COM
Common
7
IN1
Input 1
8
COM
Common
Inputs have an internal pull-up resistor and need to be 3.3 V dc tolerant.
