Trilithic EASyCAST, Руководство по установке оборудования

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EASyCAST - Installation Manual
13
Chapter 3
3. Understanding the EASyCAST
What Does the EASyCAST Encoder/Decoder Do?
The EASyCAST Encoder/Decoder receives emergency alert system information from up to six
audio sources (internal and/or external). It decodes the message, creates the appropriate audio
and video messages, and operates any routing and distribution equipment required to replay the
message for the listeners/viewers. Additionally, messages can be received over IP from EASyIP
EAS network receivers or originated by the EAS operator via local or remote control of any of the
EASyCAST Encoder/Decoders.
The EAS audio sources include internal AM/FM/NOAA radios and external audio inputs that can
be connected to any known EAS audio source. Monitoring assignments can be found in each
state’s emergency plan, which will designate local primaries (LP1 and LP2) for each stations
geographic location(s). EAS audio is decoded by the internal audio processing circuitry. It is then
interpreted to determine the type of emergency or test, locations for which the message applies,
and other information supplied in the EAS header. The voice message (if present) is recorded for
playback to the listeners/viewers.
EAS messages are passed through a series of filters to determine if the message matches
predefined, user-configured parameters. If the message passes these filters, it is either
automatically forwarded to the routing and distribution equipment, or is presented to the LCD
display, SNMP server, and EAS Console application so that it can be manually forwarded by an
operator.
The EASyCAST Encoder/Decoder activates TTL outputs, contact closure outputs, Ethernet
communications, serial communications, analog audio switches, and digital audio switches in
order to control the audio, video, routing, and distribution equipment required to present the EAS
message to the listeners/viewers. It also supplies pertinent video and re-encodes/plays the EAS
FSK, attention tone, and recorded audio. Logs are recorded in the internal Flash memory and are
accessible via serial or Ethernet using the supplied software.
Introduction
This section includes an overview and description of the EASyCAST Encoder/Decoder including
front and rear panel controls, connectors, and displays. Visit
www.trilithic.com to view or download
updates, manuals, and application notes for Trilithic EAS products.