GAI-Tronics 478-002 User Manual

Pub. 42004-120C

GAI-TRONICS® CORPORATION

A HUBBELL COMPANY

Model 478-002

Centra-Page Desktop Subs et

Confidentiality Notice

This manual is pr ovided s olely as a n op erat ional, installation, and maintenance guide and contains sens itive
bus ines s and t echnic al infor ma tion tha t is confident i al and p roprietary to G AI-Tronics. GAI-Tronics
retains a ll intellectual pr operty and other rights in or to t he inf ormation c ontained herein, and s uch
informa tion may only be used in connection wit h the operation of you r GAI- Tronic s pr oduct or system.
This ma nual may not be disclosed in any form, in whole or in p art, dir ec tly or indirectly, to any t hird pa rty.

General Information

The GAI- Tr onic s Centra-Page s ystem provides dependable p aging and party-line communications f or
rugged and hazardou s industrial fac ilities. Centr a-Page systems feat ure centrally- loc ated electronics that
provide envir onmental pr otection and unitized amplifica tion for easy maint enance. S tandard C ent ra- Page
cabinets can support up to 30 handset stations, and in most cases, up to 60 speakers. Alarms and telephone
interf acing can als o be added to Centra-P age systems.

The Model 478-002 Desktop Station is used for paging and party-line communications. Equipped with a
pus h- to-page handset and pa rty- line s elect or, the station is easy to u se.

To generate a page, the station user lift s the handset, c hecks for an availab le p arty line, presses the handset
pres sba r while announcing their page making s ure to indic ate which p arty line they are using, and relea ses
the pr es sba r. The paged individu al then goes t o a st ation, tur ns the part y- line s elect or swit c h to the
approp riate party line, lifts the handset , and answer s the page. T wo- way communica tion can then ta ke
place on the p ar ty li ne.

Although t here is no absolute limit on the number of stations in use on a given int ercom path (part y line 1
or 2) , for a “conference” ca ll, the effectiveness of t he si det one rejection circuit diminishes , and overall
perf ormance begins to diminish when four or more sta tions a re connected t oget her. It is therefore
recommended that “conference” c all pa rty line conver sat ions be limited to fou r simult aneous u sers.

GAI-Tronics Corporation P.O. Box 1060, Reading, PA 19607-1060 USA

610-777-1374  800-492-1212  Fax : [phone]

ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS

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Pub. 42004-120C

Model 478-002 Centr a- P age Deskt op S ubset Page:

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Model 478-002, like the other Centra-Page station models, corresponds to a plug-in PCBA located in the
central card rack assembly. The Model 69037-101 Line Cards are sold and shipped separately from this
station. The card contains the handset dc power sou rce, dual s witching relays, and a 1 6-watt s peaker
amplifier with 8-ohm and 70-volt line ou tput s.

This publication provides instructions on installation and operation of the Model 478-002 Desktop Station.
A list of replacement part s is included for repairs.

CAUTION

Do not install this desktop subset in any hazardous areas. This desktop subset is for “safe area”
operation only. Such installation may cause a safety hazard and consequent injury or property
damage.

Figure 1. Model 478-002 Centra-Page Desktop Subset Outline Details

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