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Table 5-1.--Glossary of Terms
GLOSSARY OF TERMS
BUS--The common connection between a group of line cutout switches. It may be in a single section or
divided; it maybe connected to a jack outlet or be free.
CIRCUIT--A quantity of telephone jackboxes connected by one or more lines, either directly or through
switchboards and switchboxes, to provide a means of communication between personnel at various stations.
JACKBOX--A weatherproof enclosure mounted in any convenient location and connected to a
sound-powered telephone line. Jackboxes can be single-gang, double-gang, or four-gang types. Gang is a
term used for the number of jack outlets in the jackbox.
JACKPLUG--The plug connected to the end of the cable on a sound-powered telephone headset-chestset.
When plugged into a jackbox, it connects the set to a sound-powered telephone circuit.
LINE--The smallest portion of a circuit that can be electrically isolated by operation of switches at a central
point. For example, in the switchboard or switchbox types of circuits, a line is the pair of wires between the
line cutout switch on a switchboard (or switchbox) and a telephone jackbox; in string circuits, a line is a pair
of wires interconnecting the various jackboxes in the circuit.
PARALLELING--Cross connecting two or more sound-powered circuits.
STATION--The location of a jackbox where a sound-powered telephone operator mans a sound-powered
telephone.
TIE LINE--A line between two switchboards, two switchboxes, or a switchboard and a switchbox. It
connects two circuits and is terminated by a switch at each end.
TIE SWITCH--A switch at one end of a tie line, usually the end connected to an auxiliary circuit. It is
normally open unless the ship's doctrine requires that it be closed.
TIE PLUS SWITCH--A normally closed switch at the opposite end of a tie line from the tie switch. It may
be opened to clear a damaged circuit.
TYPES OF CIRCUITS
SOUND-POWERED
TELEPHONE CIRCUITS
There are three types of sound-powered telephone
circuits: switchboard, switchbox, and string.
The sound-powered telephone system consists of
individual sound-powered telephone circuits, each of
Switchboard Circuit
which operates without any external source of electrical
A switchboard circuit originates from a
power. The number of particular circuits installed on
sound-powered telephone switchboard. Figure 5-1,
each individual ship depends on the operational
view A, is an illustration of a type IC/A sound-powered
telephone switchboard. Figure 5-1, view B, shows a
requirements of the ship.

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