GAI-Tronics Electro Sound Electro-Sound Communication System - Manual (Page 3)

Pub. 42004-072D
Electro-Sound Communications System Page: 3 of 9
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Temporary Transmission Lines
It is possible to create a temporary transmission line by connecting a number of extension cables in a series
arrangement until the desired distance is reached. Up to 15 handsets and/or headsets can be in use
simultaneously using a number of temporary transmission lines of this type.
Transmission Lines
One twisted pair is required for basic system operation. One additional conductor is required for the
paging option. Another additional conductor is required for the alarm option. The alarm option is
independent of the page option, so that the system can be used with any combination of the options.
Wire size should be considered carefully because of the low initial dc voltage. Generally, long lines require
heavier wire than short lines. Lines may be installed radially from the power source, looped for redundant
feed, or installed using a combination of both radial and loop. See Figure 1 for typical radial arrangements.
Interconnecting cables for Electro-Sound should not include any conductors foreign to the system. The
transmission line must be excluded from any cabling, conduit, or cable trays containing power circuits
when requirements are to minimize electrical noise pickup.
Jack Receptacles
For convenience, any quantity of receptacles can be used in a system; they can be arranged in groups or
installed singly. The standard configuration is a Jack Station Plate Assembly mounted on a single gang
weatherproof receptacle box. When the paging option is used, the cover plate must be made of insulating
material. The sleeve of the plug circuit shall not be grounded, or the page function will not operate
properly. The overall size of the jack station is approximately 3 inches
× 3 inches × 6 inches.
Wiring the system is very simple. All jacks are connected in parallel, properly observing identification
markers found near the terminal blocks on the rear of the Jack Station Plate Assemblies. Wiring that is
foreign to the operation of the system shall not be associated in any way with the interconnecting cable or
wiring, nor shall it be fed into or through the boxes housing any Electro-Sound equipment. The boxes and
conduit shall not be used to ground any other piece of equipment.
Figure 1.