Triplett Hound 3 – PN: 3392 - Manual (Page 36)

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To find an open fault in a LAN cable, first check the RJ-45
connectors on the ends of the cable. If these are OK, some
special test cables, or a Break Out Box (BOB) is necessary to
find the open along the path of the cable. First, trace the
path of the cable using the pre-described methods. Then
insert a BOB, our use a special cable to connect the clips of
the FOX of FOX 2 to the LAN cable. Connect 7 of the LAN
wires together, leaving the open faulted wire as the 8th wire.
Connect the 7 wires to one clip of the FOX or FOX 2, and
connect this clip to earth ground. Connect the open faulted
wire to the other clip of the FOX or FOX 2. Trace along the
path of the cable (which has already been located) with the
HOUND 3, listening for a sudden drop in the tone level. When
this drop is found, note its position. Continue tracing along
the path of the cable. If the tone level stays low, the point at
which the level dropped is probably the location of the open
fault. If the level comes back up, there was probably an un-
seen obstruction that caused the level to drop. Continue trac-
ing along the cable until the “true” open is found.
2.7.11: Alarm / Security Wires
Alarm and security wires can be traced like other wires. If
using a FOX 2, the True Trace feature is convenient when the
wires are connected to an enclosed magnetic switch. Sim-
ply open and close the protected opening, or use a test mag-
net, to actuate the sensor. Listen for the cadence to change.
If it changes, you’ve identified the proper wire, and verified
that the sensor is working.