Figure 3-5.-The selector switch.
The sound-powered telephone system consists of individual
sound-powered telephone circuits. As stated earlier in chapter 1,
each circuit operates without any external source of electrical
power. The number and various types of circuits installed
depends on the operational requirements of the ship.
TYPES OF CIRCUITS
There are three types of sound-powered telephone circuits:
(1) switchboard, (2) switch box, and (3) string. A switchboard
circuit originates from a sound-powered telephone switchboard.
A switch box circuit originates from a sound-powered switch
box. A string circuit consists of a series of telephone station
jackboxes connected to a common line.
From what component
What components are in
does the switchboard circuit
a string circuit?