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TECHNICAL DATA PACKAGE

Model RMS3OO

Intercom System Rack Mount Speaker User Station

SECTION 1: DESCRIPTION

SPECIFICATIONS

The Channel Selector Switch selects the channel on

which the user

will

talk and listen.

1.1 DESCRIPTION

The headphone amplifier output drives the user's

The Model RMS300, a Rack Mount Speaker User

headphones.

Station, is a component used in the

INTERCOM

SYSTEM. Each User Station is a communications

The Volume Control also feeds the speaker amplifier

unit along a multi-unit conference bus.

via the speaker switch and the speaker

network.

The System Concept Block Diagram, Figure

1-1,

shows User Station interconnection, and User Station

connection to the system power supply.

User Station interconnection can be: 1) centrally

wired, with each cable coming from a central point, or

2) distributed, where all the user stations are looped

together from one to another, or 3) a combination of

both. The centrally wired interconnection not only

reduces interchannel crosstalk, but also allows for

easier expansion into an assignable channel, multi-

channel system.

The RMS3OO Block Diagram, Figure 1-2, shows user

station functional components, input/output

connections, and controls.

The RMS3OO User Station has the following

functional components:

1) a microphone preamplifier with limiter

2) an electronic microphone switch

3) a "bilateral current source" line driver

4) a listen volume control

a headphone amplifier

6) a speaker amplifier

7) a speaker switch

a channel selector switch

The microphone preamplifier/limiter

converts the small microphone signal to a strong

line level signal

conditions the signal strength from loud and soft

talkers to be almost the same

sends the signal to the line via the microphone switch

and a "bilateral current source".

The bilateral current source adds signal, via the

channel select switch, to the line without affecting any

signals already on the line. The bilateral current

source also extracts the listen signal from the line and

sends it to the headphone amplifier via the volume

control. Some of the user's own voice signal

("sidetone") is also fed to the headphone amplifier.

The user station voltage regulator takes power from

channel

regardless of the channel selector switch

setting (exception: local power option units). The

regulator not only supplies regulated power to the

user station, but also prevents unwanted interaction

between the user station and theat intercom line

which is supplying the power. Because the regulator

takes power from channel

channel 2 can be

expanded into many channels by using a switch and,

for each channel, a separate wire and a termination

network consisting of a 200 ohm resistor and a 10

microfarad capacitor in series. (See the Application

Diagrams

the

Intercom Systems Technical

Manual).

System Power Supply terminates a line with

200 ohms.

1.1.2 Operational Controls

The RMS300 User Station has the following controls,

described and shown in Section

1) Channel Select Switch

2) Latching-action MICrophone ON-OFF toggle

switch.

3) Momentary-action MICrophone ON-OFF

pushbutton switch.

4) SpeakerlHeadphone VOLUME Control

5) CALL LIGHT switch/indicator

6) SPeaKeR ON/OFF switch

7) SIDETONE Adjustment

1.13 Connection, Inputs and Outputs

The RMS300 User Station has four input/output con-

nectors:

1) DYNamic MICrophone type HeaDSeT or handset

2) CARBON MICrophone type headset or handset

3) Line INPUT (ties the station to the intercom line

4) LOOP/EXTension (allows another station to

access the line through the first station. Also called

loop- through.)

RTS Systems, Burbank,

91506

FSCM: 60572 TDP3504

Third Edition, Sept. 1989

Page

1-1

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