Triplett Fox 2 & Hound 3 – PN: 3399 - Manual (Page 25)

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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”.
Note: On analog phone lines, Reversed polarity seldom
causes a problem. Many modular cords and couplers re-
verse the polarity of the phone line passing through them.
8.1.2: Telephone Ringer:
The FOX 2 can be used as a telephone ringer, as long as the
9 volt battery is good. This because the FOX 2’s OFF / PO-
LARITY mode will not cause an off-hook condition on most
phone systems, which will allow the system to generate a
ring signal. With the FOX 2 set to OFF / POLARITY, connect
the RJ-11 or the clip leads to the telephone line. Polarity is
not important, although the ringer functions a little differ-
ently depending on polarity. Either the NORM or the REV
LED should light. If neither LED lights, the line is “dead” and
cannot “ring”.
When the FOX 2 receives a ring signal, it will produce a beep-
ing sound and the NORM and REV LEDs flicker. Due to a
time delay in the FOX’s circuitry, the FOX usually misses the
first ring signal.
Note: Although the FOX’s ringer will not sound when the 9
volt battery is dead, the NORM and REV LEDs will flicker
during a ring signal . . . even with a dead battery.