Triplett Fox 2 – PN: 3382 - Manual (Page 10)

10
Using the FOX 2
Power Latch:
The Power Latch feature of the Function switch prevents
accidental turn-on of the FOX 2. To apply power to the FOX
2, press the Unlock button down while sliding the Function
switch from the OFF / POLARITY position to one of the other
switch positions.
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”.
To test polarity using the clip leads, connect the red clip to
the Ring wire, and the green lead to the Tip wire. 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 (Re-
versed) LED will light. If neither LED lights, the line is “dead”.