Validating Telephone Service And Polarity - Prokit’s MT-7028 User Manual

Validating Telephone Service and Polarity：
Please follow the following steps to check the polarity of telephone
lines:
1. Connect the Transmitter to the circuit as shown in
Figure 9. Connect the test leads to the telephone
punch-down blocks, RJ11, and RJ45 jacks.
2. Push
LOW" indicator will light up. Then push
the polarity indication feature and the LED indicator will
light up. Push the button again to get the product back
to standby status.
3. 「POL－/G，POL＋/R」LED indicator is dual color
(Red/ Green). The LED indicator of the Transmitter
indicates the status as below:
•
•
•
Figure 10 Validating Telephone Service and Polarity
button to turn on the power, "POWER/ BAT
Red light：Red test lead at positive (+) polarity；
Black test lead at negative (-) polarity.
Green light：Red test lead at negative (-)
polarity；Black test lead at positive (+) polarity.
No Light：Non service or line fault.
Telephone
Block
RJ11 Jack
+ RED
POL
Red test lead (+ Polarity)
Black test lead(- Polarity)
Green
POL
Red test lead (- Polarity)
Black test lead(+ Polarity)
POL
20
to operate