GAI-Tronics 10448-202 User manual

Pub. 42004-224
GAI-Tronics Corporation 400 East Wyomissing Avenue, Mohnton, PA 19540 USA
610-777-1374 n800-492-1212 nFax: 610-775-6540
[KLA1]GAI-TRONICS CORPORATION
Model 10448-202
Telephone Interface for Centra-Page Systems
Confidentiality Notice
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information which is confidential and proprietary to GAI-Tronics. GAI-
Tronics retains all intellectual property and other rights in or to the information contained herein, and
such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
Introduction
GAI-Tronics Centra-Page system provides dependable paging and party line communications for rugged
and hazardous industrial facilities. Centra-Page features centrally-located electronics which provide
environmental protection and unitized amplification for easy maintenance. Standard Centra-Page
cabinets can support up to 30 handset stations and in most cases up to 60 paging speakers. Alarms and
telephone interfacing can also be added to Centra-Page systems.
The Model 10448-202 Telephone Interface is designed to couple a Centra-Page system to the public
telephone network. The telephone line coupler is designed for loop start operation with bridged ringing.
This coupler is registered by the FCC number ADG9ZP-68744-OT-R. The Ringer Equivalence Number
(REN) is 0.0A, with an RJ11 connection.
Installation
The Model 10448-202 Telephone Interface plugs directly into a connector in the Alarm Interface Panel
located in the Centra-Page central cabinet. Included with the 10448-202 is a phone line with RJ11 plugs
on each end. One end of the line plugs into the connector on the front of the Telephone Interface labeled
"TELEPHONE LINE". The other end of the line feeds through the opening in the Alarm Interface Panel
labeled "TELEPHONE INTERFACE". This end of the line must then be plugged into a standard RJ11C
phone jack. To make this installation as simple as possible, the Centra-Page central cabinet should be
located near a phone jack. For further installation details for the Alarm Interface Panel, please refer to
the instruction manual for the 10460-002.

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Figure 1. Alarm Interface Panel
Operation
GENERAL
The telephone interface functions as follows:
1. The caller dials the phone number or PBX extension associated with the Centra-Page central cabinet.
2. Between the second and ninth ring (ring delay is user programmable; see "RING DELAY" on page
3) , a birdie tone will sound on the page line of the Centra-Page system. This signal is not on the
alarm bus. Refer to Figure 2 for DIP switch information.
3. To answer the call, an individual within the plant lifts a station handset on party line 1 and answers
the call. All of the handset stations on party line 1 must be on-hook before the call can be answered:
any station that is off-hook during the birdie tone must be placed on-hook before the call can be
answered.

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RING DELAY
General
The ring delay referred to in Step 2 is user-set by a dual in-line package (DIP) switch located inside the
telephone interface. A standard telephone may be plugged into the RJ11C jack labeled "TELEPHONE
SUBSET" on the front panel of the telephone interface. When the central cabinet phone number or PBX
extension is dialed, this telephone will ring for the programmed number of times before the birdie tone is
heard on the Centra-Page system. This ring delay allows time for the call to be answered before it
disturbs everyone at the facility. If this telephone is used to answer a call after the birdie tone has
started but before anyone on the Centra-Page system has answered the call, the tone will stop
broadcasting over the Centra-Page system and the telephone circuit will remain isolated from the Centra-
Page system.
If a call is answered at a telephone subset, the call can still be transferred to the Centra-Page system by
depressing the "ACCESS" button on the Telephone Interface front panel. The call will be transferred to
party line 1 even if one or more stations are off-hook. The "ACCESS" button overrides the need to
have all stations on-hook before a call can be transferred to the party line. To disconnect a call from an
outside phone line to the Centra-Page system, depress the "DISCONNECT" button on the Telephone
Interface. The call will be disconnected immediately.
Figure 2. Detail of Telephone Interface Card

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Setting Ring Delay
The Model 10448-202 Telephone Interface is designed to delay connection of incoming telephone ring
signals to the Centra-Page system between 1 and 8 rings. The number of ring bursts required to activate
the Telephone Interface ring repeater is set by switch S3, located on the Telephone Interface card
assembly. This assembly is located under the rear upper cover plate directly behind the front panel.
To remove the plate, loosen the two hex head screws on the top of the enclosure and remove the two
screws that secure the bottom of the plate to the Telephone Line Coupler bracket. Access to S3 can be
gained by carefully moving the cover plate to the side. Figure 2 is a detailed drawing of the printed
circuit card area around S3. S3 is factory-set for a ring delay of one (S3 Position 1 - ON). To change the
ring burst delay, turn S3 Position 1 - OFF and the appropriate S3 Position ON. The S3 position number
corresponds directly to the ring signal delay. Notes: One S3 position must be selected and only one
position can be activated at a time. When ring delay setting is complete, replace the cover plate and
screws.
OPTIONS
If the central cabinet is not in a location where the telephone interface front panel can be accessed,
remote auxiliary switches can be connected to perform the access/disconnect functions. The central
cabinet is equipped with terminal blocks to connect these auxiliary switches. For details on remote
auxiliary switch installation, please consult the instruction manual for the central cabinet.
Maintenance
TROUBLESHOOTING
The GAI-Tronics Centra-Page system is designed to function reliably. However, if problems are
encountered with the system or its components, please reference the following troubleshooting guide:
Problem Solution
No activity. Check the power connections on the Alarm Interface Panel.
No birdie tone. Check and adjust the speaker level controls for the station cards.
Adjust the birdie level inside of the Telephone Interface at
resistor R45. Check the telephone connections by plugging a
telephone subset to the telephone line.
The birdie tone works, but the
auto access to party line is not
occurring.
Check the party line connection on the Telephone Interface, the
Alarm Interface Panel, and the card cage. Make sure the
telephone subset is on the correct line for access.
Auto disconnect is not working. Check for a subset off-hook other than the one in use.
Connection drops out while
talking. Check the power supply. The connection may also drop if someone else pages when the telephone interface is in use.
Service Restriction: Rules of the FCC applicable to registered telephone equipment allow replacement of
the printed circuit board assembly and adjustment of the option jumpers by the user or service personnel.
Component replacement may only be performed by authorized factory personnel.