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20 ExtroNews 12.2 March/April 2001

Matrix Switching

A matrix switcher is a specific type of switcher

that routes multiple inputs to multiple outputs.

Internally, a matrix switcher consists of a series of

distribution amplifiers and switchers, housed in a

single enclosure and controlled by remote or front

panel controllers. Matrix switchers, depending on

the specific model, are able to route composite

video, S-video, HDTV/component video,

RGsB/RGBS/RGBHV video, SDI, and/or stereo audio

(balanced/unbalanced) signals. Matrix switchers are

commonly used in applications such as

presentations, data display, and entertainment, and

they can be a perfect fit for a more complex

videoconferencing environment.

To provide total solutions for different routing

applications, Extron’s matrix switchers offer a

variety of features and are available in input/output

configurations from 4 x 4 up to 256 x 256. Your

selection will depend on the size of the

videoconferencing facility and other applications

your matrix may be used for. Some facilities may

benefit if the videoconferencing and A/V

presentation systems share the same matrix

switcher; the product sharing may well result in

reduced costs, increased signal routing flexibility,

and less need for A/V equipment rack space.

Videoconferencing in a Multi-Room Facility

The illustration (on page 21) depicts two

dedicated videoconference rooms and additional

VC-enabled rooms. In the Extron S3 Technical

Institute, Extron Matrix 6400 Switchers make our

multi-room videoconference concept a reality; any

If you have ever come across the task of

designing a system to accommodate a number of

different videoconferencing scenarios: large

audience, small audience, or both simultaneously,

you know this can be tricky. When designing VC

capabilities into Extron’s S3 Technical Institute, we

knew that a standard, small venue videoconference

would typically be held in one of two dedicated

videoconference rooms. But the prospect of

accommodating a larger audience created another

situation. We needed to be able to conduct a

videoconference in one of the larger training

rooms, or to conduct a single videoconference

simultaneously in multiple rooms. To route the

videoconference signal to any display in any room,

we used Extron matrix switchers.

Part 3: Multiple Scenarios for a Videoconferencing Environment

e set the stage for a standard videoconference in our last two issues. First, we put

together a basic setup plus a computer-to-video scan converter for incorporating PC

images. Then we added a little complexity and flexibility by incorporating a multi video

processor, so multiple sources can be simultaneously displayed to far-end participants. Now let’s

add another variable to the videoconference equation—multiple sources and destinations, in

rooms other than the dedicated videoconference room.

SPECIAL VIDEOCONFERENCING SERIES

Camera

Codec

Display

Classroom

Matrix 6400

Videoconference Room #1

MATRIX 6400

WIDEBAND VIDEO

POWER SUPPLIES COMMUNICATIONS

PRIMARY

RGB

MUTE

AUDIO

MUTE

RS232 BME REMOTE

SYSTEM

STATUS

REDUNDANT RX

DIAGNOSTICS

FPC-1000

This simplified routing diagram illustrates how two rooms can share videoconferencing

capabilities via an Extron Matrix 6400 Switcher.The videoconferencing codec and cameras

in one or both rooms feed the matrix. Outputs can then be sent to the videoconferencing

codec and displays in either or both rooms. (See illustration on next page.)

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