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JACK SCHEMATICS
JACKS AND PLUGS
FAX: 773 792-2129
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JACK SCHEMATICS
79
Circuit Types: Jacks normally have through circuits, shunt
circuits, and/or isolated switching circuits, either individually or
in various combinations. The chart below shows schematics of
39 common jacks - many more combinations are possible, but
these are the most commonly used. A basic description of the
switching action of each jack accompanies each schematic.
Military Identification: Military specifications covering phone
jacks use a special code to describe jack functions. Jack
schematic descriptions are coded J-1 through J-13 (as
Notation
1-A
1-B
1-C
1-D
Meaning
One, SPST switching circuit. Also known as NO
(normally open) or “make” circuit.
One, SPST switching circuit. Also known as NC
(normally closed) or “break” circuit.
One, SPDT switching circuit. Also known as transfer
or “break” before “make” circuit.
One, SPDT switching circuit. Also known as “make”
appropriate) to coincide with Federal Item Identification
Guides for Supply Cataloging. One or more groups of suffix
numbers/letters identify isolated switching circuits used.
Suffixes identify the switching by industry recognized notation,
i.e., 1-A, 1-B, 1-C, 1-D, etc. See chart below.
before “break” circuit.
NOTE: Number indicates the quantity of circuit - 2-A means 2, A circuits.
Terminals locations shown on jack schematics do not necessarily coincide
with physical locations on jacks. Not all circuit types available on all jacks.
Single open circuit. (J1.)
Single closed circuit,
Single closed circuit. (J4).
Double open circuit. (J2).
Single open circuit.
sleeve common. (J3).
Isolated switching
“make” circuit. (J1-1-A).
Transfer circuit. (J5).
Tip closed, ring
open. (J10).
Tip closed, ring open
(common to sleeve). (J6).
Single open circuit.
Isolated switching
Double closed circuit,
ring common to
“break” circuit. (J1-1B).
sleeve. (J13).
Single closed. Isolated
switching “make”
circuit. (J4-1A).
Double open circuit.
Isolated switching–
separate “break” and
Double closed
circuit. (J7).
Single closed circuit
Isolated switching
“break” circuit. (J4-1B).
Single closed circuit.
Isolated switching
transfer circuit. (J4-1C).
Single closed circuit–
“make” before
“break”. (J8).
Double closed circuit.
Isolated switching
“break” circuit. (J7-1B).
Single open circuit.
Isolated switching
transfer circuit. (J1-1C).
Double open circuit.
Isolated switching
transfer circuit. (J2-1C).
Double open circuit.
Isolated switching
“make” circuit.
make circuits (J2-1A-1B).
(J2-1A).
Double open circuit.
Isolated switching–
separate “make”
circuits on both tip and
ring. (J2-2A).
Double closed circuit.
Isolated switching
“make” circuit on ring
spring. (J7-1A).
Single closed circuit
plus “make” before
“break”. Isolated
switching–“make”
before “break”
Single open circuit.
Isolated switching–
separate transfer and
“make” circuits.
(J1-1A-1C).
Single closed circuit.
Isolated switching
“break” circuit. Sleeve
common to isolated
switching circuit throw.
circuit. (J8-1D).
DIMENSIONS ARE FOR REFERENCE ONLY
Inch
(mm)
(J4-1B).
SWITCHCRAFT, INC. 5555 N. Elston Ave. ? Chicago, IL 60630
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