How It Works - Elenco Electronics TWT-1K Assembly And Instruction Manual

HOW IT WORKS

The TWT-1 Analyzer is easy to use in quick testing
of the telephone lines. It will indicate by the color of
the LED if the wiring is correct, reversed or if it is not
working at all.
Figure 5
It has four bi-colored LEDs that will light green or
red. LEDs 1 and 2 will respond to testing of an
RJ-11 jack having one or two lines. LEDs 1, 2, 3
and 4 will respond to testing of an RJ-45 jack
having one, two, three, or four lines using a wiring
scheme (see Figure 9).
Green LED is Lit - Indicates that the line
tested is operational and the wiring is correct.
Red LED is Lit - Indicates that the wiring to
the jack is reversed.
would make the phone inoperative and would
require a reversal of the wires terminating at
the phone jack. On many new phones, the
phone circuitry recognizes this reversal and
corrects for it.
No LED Lit - Indicates that the circuit is not
operational (open or shorted).
On some phones, it
WIRING CONFIGURATION
for RJ-11 JACKS
RJ-11-2
1 6
Red Green
Red Green
RJ-11 Jack
One Phone Line
Shows detail of how
the tip and ring are
connected on a four
connector cable.
+ = Tip
_ = Ring
Plug Polarities
Figure 8
Shows how the
phone wires relate
to the LEDs on the
analyzer for RJ-11.
PR 1
Wires 3 and 4
When we refer to an RJ-11 plug and jack, we are
generally referring to a single or dual line plug and
jack. In the industry they may sometimes refer to an
RJ-11-2 as a single line jack and an RJ-11-4 as a
two line jack. Most modular jacks today are pre-
wired with four wires and are suitable for one or two
lines. From the face of the wall plate, it is difficult to
tell if it's wired for one or two lines.
-3-
Figure 6
Typical color
scheme for one or
1
two lines.
Black
Red
Red
Black
RJ-11 Jack
Two Phone Lines
Figure 7
PR2
PR1
O
P
E
N
1 3 4
2
Wires 2 and 5
RJ-11-4
6
Yellow
Green
Green
Yellow
O
P
E
N
5 6
PR 2