Triplett Fox 2 & Hound 3 – PN: 3399 - Manual (Page 24)

24
Switch (D) sets the basic operating mode. The 4 positions
each have several testing functions associated with them.
The follow text describes these test features in detail. The
red and green LEDs (E) provide indication of telephone line
polarity. An adapter cable (F) is provided to allow the RJ-45
jack (G) on the FOX 2 to be connected to an RJ-11 jack.
Green LED (H) flashes to indicate that the battery is good,
and to display the cadence of the Tone signal. The Warble /
Pulse Button (I) selects the preset Tones (selected by inter-
nal jumpers). Alligator clips (J) allow the FOX to be con-
nected to a variety of different wires and cables.
8.1.1: Telephone Loop Current and Line Polarity Testing:
The polarity of the DC loop current on standard analog tele-
phone lines can be tested. In telephone circuits, the green
and red wires are identified as Tip and Ring respectively.
Remember, Ring is red. In telephone circuitry, the red wire
is negative polarity, not positive. (Note: The Ring just men-
tion has nothing to do with a phone ringing.)
The FOX 2 will determine if a line has Loop Current (is “live”,
i.e. connected to the phone system), and what the polarity
of the current is.
With the provided RJ-45 / RJ-11 Adaptor cable plugged into
the FOX 2, plug the RJ-11 end into the modular telephone
jack to be tested. If the line is live and the polarity is correct,
the green NORM (Normal) LED will light. If the polarity is
backwards, the red REV (Reversed) LED will light. If neither
LED lights, the line is “dead”.