Chapter 6 Automatic Dial telephone System

CHAPTER 6

AUTOMATIC DIAL TELEPHONE SYSTEM

LEARNING OBJECTIVES

Upon completion of this chapter, you will be able to do the following:

Describe the purpose of the automatic dial telephone system installed on Navy

ships.

Identify the two versions of the type G telephone sets used with the system.

Describe how the two versions of the type G telephone sets operate and how

the sets are maintained.

Identify some of the more common troubles associated with the telephone sets.

Describe some of the different types of telephone switchboards and how they

are maintained.

Describe the functions of the automatic dial telephone switchboards.

Identify the automatic switching equipment used with the switchboard.

Describe the function of the attendant's cabinet used with the switchboard.

Describe the procedures for isolating and clearing the various alarms associ-

ated with the switchboard.

Briefly describe some of the preventive maintenance procedures associated

with the switchboard and the attendant's cabinet.

Describe how shore lines are connected to the ship's automatic dial telephone

system and other telephone sets on the ship.

mechanisms are controlled at the calling phone by a

INTRODUCTION

dial on the telephone instrument. When the dial is

The automatic dial telephone system (designated

operated, it causes a series of interruptions, or

circuit J) is used on board ship primarily as an admin-

impulses, in a current flowing in the line circuit. The

istrative circuit. It also supplements other communica-

number of impulses sent out by the dial corresponds

tion facilities for ship control, fire control, and damage

to the digit dialed. These impulses cause the automatic

control on board ship. The automatic dial telephone

switches to operate and to select the called telephone.

system provides two-way telephone communications

on a fully selective basis under the direct control of

The automatic dial telephone system consists of

the calling stations. This includes two-way communi-

(1) telephone line station equipment and (2) an

cations between telephone line stations throughout the

automatic dial telephone switchboard that includes the

ship and between ship and shore systems.

switching mechanisms necessary to interconnect the

line stations and accessory equipment used to

In an automatic telephone system, the connections

interconnect the ship's system with shore systems

between the telephones are completed by remotely

when the ship is in port.

controlled switching mechanisms. The switching

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