Triplett Fox & Hound 3 – PN: 3397 - Manual (Page 7)

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5: Specifications
5.1: FOX Specifications
5.1.1: Telephone Loop mA and Line Polarity Test:
Indication: Red LED lights to indicate presence of Loop mA
in correct polarity
Load: Approx. 13mA at 50VDC (usually less than off-hook
recognition current)
5.1.2: Visual Ring Indication:
Indication: Red LED flashes to indicate ringing
5.1.3: Tracer Tone (with fresh battery):
Waveform:
Square Wave or Differentiated Square Wave Level:
Approx. 8Vpp (+14dBu, 600 Ohm) into an open circuit
(un-terminated cable or telephone line)
Approx. 5Vpp (differentiated) +2dBm into a 600 Ohm
load (terminated telephone line)
Frequencies (3 types):
LO - approx. 800Hz
HI - approx 1000Hz
WARBLE - alternates between LO and HI
5.1.4: Connections:
RJ-11 Plug for connection to telephone lines
Color Coded Alligator Clips for connection to stripped wires
or terminals