Figure 6-28.--Attendant's console.

switchboard cabinets (fig. 6-27). An attendant's

COMMON CONTROL PANEL (100 ASSEM-

cabinet (fig. 6-28) provides an interface between ship

BLY).-- The common control assembly consists of six

lines and shore installations when the ship is in port,

separate, though related, circuits. The main function

as shown in (fig. 6-26).

of the 100 assembly is to provide timing for finder

action requests and to extend finder request ground

Each cabinet (system or switchboard) consists of

(positive signal voltage) to the finder allotter. This

one rack of equipment shock-mounted in a rigid

assembly also provides dial tone and busy tone for the

cabinet assembly. The cabinet circuit modules,

system.

accessible through front and rear doors, plug into the

framejack panel and contain all the switching circuits

LEVEL

DETECTOR

AND

ALARM

necessary for system operation. Two XY universal

CIRCUITRY (200 ASSEMBLY).-- The level

switches are associated with each of the 15

detector panel contains 10 identical level detection

finder/connector circuit modules used in each

circuits, one for each system level, and a portion of

switchboard cabinet. These switches mount in cells

the major and minor alarm circuits. The function of

located on the front of the frame and plug into the

the level detector is to receive negative battery signal

associated finder/connector circuit modules. The line

via a closed tip/ring loop of the line station requesting

connection panels are mounted directly to the

service; to operate the appropriate level relay; and to

switchboard frame (fig. 6-27). These panels provide

extend resistance battery to the sleeve wire bank and

the means for connecting the switchboard to the

a finder request ground to initiate linefinding for that

ship's cables. Screw-type terminals are provided for

level (group).

all connections, allowing line-number changes to be

readily accomplished.

FINDER ALLOTTER PANEL (300 ASSEM-

BLY).-- The finder allotter panel, also referred

Main Assemblies of the Switchboard Cabinet

to as the link allotter, contains 15 identical

circuits, one for each finder circuit and a finder

There are nine main assemblies in the MDM

bypass relay for each finder. The circuit is used

200/700 system. Each has both a name and a number

to select the next idle finder in the system. If the

designation.

selected finder takes longer than 2 seconds to

find the calling line, a finder bypass alarm is

initiated.

FINDER/CONNECTOR PANEL (400 AS-

SEMBLY).-- The finder/connector panel, also

referred to as a link, is made up of two main

sections: the finder circuit, where linefinding is

accomplished by the finder XY switch; and the

connector circuit where connection to the calling

line is accomplished by the connector XY switch.

The XY switch is external, but is part of the

link. The transmission path is established in the

assembly between the calling and the called

telephones.

SWITCHBOARD MONITOR PANEL (500

ASSEMBLY).-- The switchboard monitor panel

contains three alarm signaling circuits that

react to an off-hook alarm, a failure-to-restore

alarm, and a finder bypass alarm. The link index

switch determines the alarm condition. The

panel also contains a line test jack, two

functional lever switches, and eight indicator

lamps. This panel activates audible as well as

visual alarms.

LINE PANEL (600 ASSEMBLY).-- There are 10

line panels in each switchboard cabinet. Each panel

140.164

provides connections and switching facilities for one

Figure 6-28.--Attendant's console.

level (group) of 10 telephones. The line disconnect

6-33