Elenco Electronics TWT-1K Assembly And Instruction Manual
TELEPHONE LINE ANALYZER KIT
MODEL TWT-1K
Assembly and Instruction Manual
Elenco Electronics, Inc.
Copyright © 2001 Elenco Electronics, Inc. 753082
PARTS LIST
RESISTORS
Qty. Symbol Value Color Code Part #
1 R9 120W 5% 1/2W brown-red-brown-gold 131201
1 R4 560W 5% 1/2W green-blue-brown-gold 135601
7 R1-R3, R5-R8 680W 5% 1/2W blue-gray-brown-gold 136801
SEMICONDUCTOR
Qty. Symbol Description Part #
4 D1-D4 Bi-Color (Red/Green) LED (Light Emitting Diode) 350007
MISCELLANEOUS
Qty. Description Part #
1 PC Board 519032
1 Solder 551135
1 Battery Snap 590098
1 Top Case 623124IC
1 Bottom Case 623219IC
Qty. Description Part #
2 Screw 643111
1 Label 723017
1 4 Wire Cable with RJ-11 Plug 920023
1 8 Wire Cable with RJ-45 Plug 920024
PARTS IDENTIFICATION
Resistor
Color bands show
resistor values
Semiconductor
LED
PC Board Top Case
4 Wire Cable with RJ-11 Plug
8 Wire Cable with RJ-45 Plug
Miscellaneous
Bottom Case
Battery Snap
IDENTIFYING RESISTOR VALUES
Use the following information as a guide in properly identifying the value of resistors.
Multiplier
Color Multiplier
Black 1
Brown 10
Red 100
Orange 1,000
Yellow 10,000
Green 100,000
Blue 1,000,000
Silver 0.01
Gold 0.1
Bands
1 2
Multiplier
Tolerance
BAND 1
1st Digit
Color Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9
BAND 2
2nd Digit
Color Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9
-1-
Screw
Label
Resistance
Tolerance
Color Tolerance
Silver +/-10%
Gold +/-5%
Brown +/-1%
Red +/-2%
Orange +/-3%
Green +/-.5%
Blue +/-.25%
Violet +/-.1%
SPECIFICATIONS
CATEGORY OF WALL PLATE JACKS
• Standard RJ-11 modular jacks with active telephone lines (one or two lines).
• Standard RJ-45 modular jacks with active telephone lines (one to four lines) for configuration EIA/TIA 568A
or B, AT&T 258A, token ring, or 10 BASE-T.
MULTIPLY FUNCTIONS
• Polarity identify (straight or reverse) cable and/or pairs.
• Open or short wiring test.
INTRODUCTION
The TWT-1 Telephone Line Analyzer has been designed to test telephone wall plates using RJ-11 and RJ-45
jacks. The most common jack used in homes, offices, or commercial establishments is the RJ-11. It is designed
to connect up to three telephone lines. However, it is most common to have one or two lines connected to the
jack. Your TWT-1 Tester will test up to two lines on an RJ-11 jack or up to four lines on an RJ-45 jack.
Line from outside
To other phones
Modular
Plug
Figure 1
Surface Mounting Modular Jack
Jack
Figure 2
Wall Plate Using RJ-11 or
RJ-45 Jacks (Modular Outlet)
Figure 3
Another Type of Wall Plate Using RJ-11 Jack
(Modular Outlet)
When testing a wall plate using an RJ-11 in a home, keep in mind that the single line may have multiple phones
connected. Figure 4 shows a home or office with three phones connected to a single incoming line. Note they
are in parallel. The 42A block, shown in Figure 4, is where your telephone lines start in your home or office.
The 42A block may have terminals marked “R”’ and ”‘T”. “R” stands for Ring and “T” stands for Tip. If correct
wiring procedures were followed, then red goes to “R” ring and green goes to “T” tip. Color code terminations
should be followed at all wall plates.
Figure 4
Multiple Phones Connected to a Single Line
R
Single Line
To Protector
42A
Red
T
Green
-2-
Wall
WallDesk
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.
WIRING CONFIGURATION
for RJ-11 JACKS
Figure 6
Typical color
RJ-11-2 RJ-11-4
1 6
scheme for one or
two lines.
1 6
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.
Yellow
Green
Green
Yellow
Red
Red
Green
Green
Black
Red
Red
Black
RJ-11 Jack RJ-11 Jack
One Phone Line Two Phone Lines
Figure 7
Shows detail of how
the tip and ring are
connected on a four
connector cable.
+ = Tip
_
= Ring
Plug Polarities
O
P
E
N
2
3
PR2
PR1
4
5
Figure 8
Shows how the
phone wires relate
to the LEDs on the
analyzer for RJ-11.
O
P
E
N
61
Red LED is Lit - Indicates that the wiring to
the jack is reversed. On some phones, it
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).
PR 1
Wires 3 and 4
Wires 2 and 5
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 prewired 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-
PR 2
WIRING CONFIGURATIONS
FOR RJ-45 JACKS
The RJ-45 indicates an 8-wire plug or jack. There
are many standards which dictate which wire pairs
connect to which pins on a plug or jack. Some of
these standards are listed below.
Figure 10
Typical color
scheme for eight
lines.
1 8
EIA/TIA-568A
EIA/TIA-568A
EIA/TIA 568B
or AT&T 258A
Token Ring 10 Base T
Figure 9
Different Wiring Standards for RJ-45 8-Wire Jacks
Red
Black
Blue
Orange
Orange
Blue
Black
Red
Green
Yellow
Gray
Brown
Brown
Gray
Yellow
Green
RJ-45 Jack
Figure 11
Shows detail of how the tip and ring are connected on
a eight connector cable for EIA/TIA-568A standards
on Figure 9.
PR3 PR4
PR2
PR1
The telephone line analyzer TWT-1 is designed to
test the standard configurations shown in Figure 9.
The Electronic Industries Association established
this sequence as a “commercial building
specification”.
Shown below are the wire color codes for an
EIA/TIA-568A, shown in Figure 9.
White / Green
T
3
R3Green / White
T2White / Orange
R1Blue / White
T1White / Blue
R
Orange / White
2
T4White / Brown
R4Brown / White
2
1
Plug
Polarities
+ = Tip
_
3
= Ring
4
5
6
7
8
Figure 12
Shows how the phone wires relate to the LEDs on
the analyzer for EIA/TIA-568A.
PR 1
Wires 4 and 5
PR 2
Wires 3 and 6
PR 4
Wires 7 and 8
PR 3
Wires 1 and 2
-4-
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