User Manual

EASy-PLUS

User Manual

– 21

TRILITHIC

Rev 1.02

SECTION 6

EASy-PLUS

Encoder/Decoder Installation and Wiring

6.1 INTRODUCTION

The EASy-PLUS

receives E.A.S. messages from up to six audio sources (internal or external), decodes the message, and

operates Cable System equipment to replay the message for subscribers. In addition, messages can be originated by the

user via local or remote control of the EASy-PLUS

. The E.A.S. audio sources for the EASy-PLUS

include internal AM/FM/

NOAA radios and external audio inputs that can be connected to any known E.A.S. audio source. E.A.S. audio is decoded

by the internal AFSK circuitry, sorted, and then interpreted to determine the type of emergency or test. The locations codes

for which the emergency applies, and other information supplied in the E.A.S. header are also decoded. If a voice message

is contained in the E.A.S. message, it is recorded for playback to subscribers. E.A.S. messages then pass through a series

of tests to determine if the message matches predefined, user configurable filters and parameters for your location. E.A.S.

activation of the cable system then automatically occurs. To play an E.A.S. message to your subscribers, the EASy-PLUS

activates TTL drivers and Contact Closures, as well as sending commands via RS-485 and High Data Rate AFSK. The

EASy-PLUS

also supplies pertinent video and re-encodes and plays the E.A.S. FSK header and recorded audio. The TTL

drivers, Contact Closures, and RS-485 commands activate your interface equipment (i.e. I.F. switching, comb generator,

baseband character generators) throughout the headend to provide the emergency audio and video to all channels of the

cable system. In addition to the E.A.S. messaging capabilities, the EASy-PLUS

logs all received and transmitted mes-

sages to a printer, the LCD display, and it’s internal log storage area.

7.2 INSTALLATION AND WIRING OF THE EASY-PLUS

ENCODER/DECODER

Typical installation of the encoder/decoder requires the operator to attach radio antenna inputs at the Audio Expansion 1

coaxial input connectors, attach AUDIO and CG VIDEO Outputs to either an I.F. source modulator or audio input to a comb

generator, and attach either TTL control line output to I.F. switching devices or a contact-closure output to the comb genera-

tor. Optional control of the Motorola OM-1000 QPSK modulator is accomplished by using a secondary contact-closure

attached to the red and black terminals at the rear of the OM-1000.

7.3 PINOUT DESIGNATIONS AT THE REAR PANEL OF THE EAS-yPLUS

ENCODER/DECODER.

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