Identifying Telephone Line Polarity; Verifying Telephone Lines - Fluke MicroNetBlink Kit User Manual

Identifying Telephone Line Polarity

1. Set the toggle switch to the Off/Volt ü
position.
2. Connect the black alligator test lead to the TIP
(+) connection, usually green or blue.
3. Connect the red alligator test lead to the RING
(-) connection, usually red or marked R.
The LED indicator will light up:
GREEN indicates normal polarity
RED indicates reversed polarity
RED/GREEN indicates presence of AC power
on the telephone line

Verifying Telephone Lines

1. Set the toggle switch to the Off/Volt ü
position.
2. Insert the standard 4-pin modular cable into
the modular wall jack, or connect the red
alligator test lead to the RING (-) and the black
alligator test lead to the TIP (+).
The LED indicator will light up:
GREEN indicates a correct wired telephone
circuit that is on-hook
GREEN (DIM) indicates a correct wired
telephone circuit already in use or off-hook
RED indicates a reversed polarity phone circuit
3. Use a second phone line to dial the number
under test.
RED and GREEN (rapidly flashing) indicates a
ringing signal.
MicroNetBlink / MicroProbe
TM TM