Figure 6-19.--Switch and fuse panel for the 100-line switchboard, cabinet 1.

contains equipment gates, the power supply, two

Provide "hunt-the-not-busy-line" service

ringing generators, and aground fault detection panel.

where required.

The rear section of both cabinets contains the rest of

Provide "emergency cut-in" service to line sta-

the crossbar switches. For the 100-line switchboard,

tions as specified.

seven switches are mounted in the rear section of

cabinet 1 and two switches are mounted in the rear

Disconnect the calling and called stations at the

section of cabinet 2. For the 150-line switchboard.

completion of the conversation.

seven switches are mounted in the rear section of each

cabinet. The rear panel of each cabinet is removable

Any two-wire, dial telephone set using break-type

to facilitate access to the rear section and the crossbar

dialing can be used with the system.

switches.

Switchboard Equipment

EQUIPMENT GATES.-- There are two equip-

Description

ment gates in each switchboard cabinet. The upper gate

in each cabinet mounts the switch and fuse panel for the

respective cabinet. The lower gate mounts the circuit

The automatic switching equipment is housed in

card cage. All the equipment gates swing out, providing

two dripproof, steel, shock-mounted cabinets. Each

access to the crossbar switches mounted in the rear of

cabinet has a front section and a rear section. The front

each cabinet in the event the rear panel cannot be

section of cabinet 1 contains equipment gates and one

removed. This swing-out feature also provides access

crossbar switch. The front section of cabinet 2

Figure 6-19.--Switch and fuse panel for the 100-line switchboard, cabinet 1.