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SHIP/SHORE FRAME PANEL (1500
switches are located in this panel. This panel is also
ASSEMBLY).-- This panel has the capability of
where a station can be wired for executive-
connecting the eight ship lines to the shore lines. It is
right-of-way or become part of a line hunt group.
used to monitor the ring and busy interrupter circuits
SELECTOR PANEL (700 ASSEMBLY).--
and to give visual indication that the attendant's
There are five selector panels, each containing three
console is energized. The panel also provides a direct
identical selector circuits. The selector circuit
audio path to the attendant's console for test purposes.
provides the means by which a telephone station can
call any other station in the system. Specifically, the
(1600 ASSEMBLY).-- This assembly contains two
selector performs the basic functions of busy testing
solid-state ring generators, switches for controlling
available connectors, ringing, ring trip, extension of
ring voltages, and four major power distribution buses
the line restriction feature, and call answer.
and their associated terminal connectors.
POWER SUPPLY (800 ASSEMBLY).-- The
SYSTEM CONNECTION PANEL (1700
power supply unit uses a single-phase, full-wave
ASSEMBLY).-- Eight terminal blocks are mounted
rectifier with choke input for regulation and diode
on this panel. They are used as connection points for
surge current protection. A choke together with filter
various system functions.
capacitors provide low ripple dc power. A two-
position power selector switch is provided. Turn it to
BATTERY CHARGER (1800 ASSEMBLY).--
the 125V position if input ac power is greater than 120
The battery charger is a standard, alternating to direct
volts, If input ac power is less than 120 volts, turn it
current, solid-state unit. It can maintain a 23-, 24-, or
to the 115V position. Each switchboard contains its
25-cell battery in a fully charged condition. The output
own power supply unit.
voltage is adjustable from 48 volts to 56 volts dc at a
maximum charging rate of 6 amperes.
ASSEMBLY).-- This assembly distributes dc power
In recent years, ships equipped with the MDM
to equipment in the switchboard cabinet.
system have had, via authorized SHIPALT, the 1800
assembly remotely located. A switch panel has been
Main Assemblies of the System Cabinet
installed in the 1800 assembly cavity that facilitates
individual switchboard power-down for corrective
The system cabinet consists of nine main
and preventive maintenance actions.
assemblies: 1100, 1200, and 1300 through 1900. Four
SYSTEM MONITOR PANEL (1900 ASSEM-
of these (1100, 1200, 1300, and 1500) are associated
BLY).-- The system monitor panel is integrated in the
with the operation of the attendant's console.
MDM system. It monitors and tests all finder/selectors
SHIP LINE MODULES (1100 ASSEM-
and connectors in the system. The panel contains call
BLY).-- There are eight identical ship line modules,
count indicators and all-trunks-busy indicators.
one for each ship line connected to the attendant's
Voltage monitoring and alarm locating circuits give
console.
the maintenance person a quick indication to the
SHORE LINE MODULES (1200 ASSEM-
condition of any switchboard cabinet in the system.
BLY).-- There are eight identical shore line modules,
ATTENDANT'S CONSOLE.-- The MDM
one for each shore line associated with the attendant's
200/700 installations are equipped with attendant's
console.
switching circuitry to provide for attendant-assisted
SHIP/SHORE CONTROL MODULE (1300
ship-to-shore communications. This circuitry is
mounted in the system cabinet (fig. 6-26), and consists
A S S E M B L Y ) . -- This module contains all the
of eight ship-line panels (one for each ship line) and
necessary circuitry to control the operation and
interconnection of the ship and shore lines through the
one control panel. The attendant's switching circuit is
attendant's console.
controlled from a remotely located attendant's console
RING/BUSY INTERRUPTER PANEL (1400
Since all of the attendant's switching equipment
A S S E M B L Y ) . -- This panel consists of tone
is mounted in the system cabinet, each console (a
interrupter circuits and a ring timing circuit. It
maximum of three per system) is used only to perform
generates ground pulses that control ring voltage and
the functions of a standard telephone with push-button
busy tone interruptions used in the selector circuitry.

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