Control Panel Description and Installation
150964 4-33
4.20.1 Second Phone Line Monitor Connection (Model
4875)
The 4875 provides a second phone line connection. It includes the line monitor and ring detec-
tor for the second line.
Figure 4-23 Location of Dual Phone Line Monitor (Model 4875) on Model 4821/4820 Board
Table 4-6: Second Phone Line Monitor Terminal Description
Pin Number Description
1 Circuit Ground
2 +12 VDC
3 Monitor 2
4Report Relay
5 Power Phone Line 2 Relay
6 Phone Power
7 Circuit Ground
8 Earth Ground
9Line 2 Tip
10 Line 2 Ring
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