Triplett Fox & Hound 3 – PN: 3397 - Manual (Page 21)

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Helpful Hint:
Although the FOX does not require a battery when generat-
ing a tone when Loop Current is present, if a battery is in the
FOX, it will be used as part of the FOX’s power source. Due
to the FOX’s internal circuitry, less battery power is used if
the FOX is connected to the line in Reverse Polarity, i.e. Tip
to Negative, Ring to Positive. Therefore, for greatest battery
life, connect to a powered line in Reverse Polarity.
8.1.2: OFF / LINE POLARITY:
Telephone Loop Current and Line Polarity Testing:
“Loop Current” is provided by the Telephone Company (the
Central Office…. CO) to power the typical telephone. With-
out Loop Current, a telephone won’t work. The FOX can test
a telephone line for the presence of Loop Current, and test
for its proper polarity.
In telephone circuits, the green and red wires are identified
as Tip and Ring respectively. Remember, Ring is red. In tele-
phone circuitry, the red wire is negative polarity, not posi-
tive. (Note: The Ring just mention has nothing to do with a
phone ringing.) .
The FOX’s modular plug is wired in the standard polarity used
in the telephone industry. The alligator clips are also polar-
ized, with the Red clip being the Ring and the Green clip
being the Tip connection.
Referring to Figure 1, set the Function Switch (B) to its OFF/
LINE POLARITY position. Plug the Modular Plug (D) into