Table 5-1.--Glossary of Terms

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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