DRAKE EH24 Instruction Manual download pdf (Page 6)

General Description

EH24A

The Drake model EH24A, encoder host, is the core multiplexer, QAM modulator, up-converter, ASI output, user interface,

and power supply for the SDE24, HDE24, and SDI24A encoder modules. Up to six encoder modules can be installed

into the EH24A via rear panel access. SDE24 encoders can encode one or two programs, depending on whether MPEG2

or MPEG4/H.264 encoding is used (see below), per module. Typical applications are to provide MPEG video in MDUs,

medical facilities, libraries, stadium video networks, private cable and other QAM applications. The EH24A may be used

in Edge or headend applications. There are two multiplexers in the EH24A, one providing an ASI output stream and one

providing a stream to the built in QAM modulator/upconverter. The latest firmware release provides EAS implementation

and allows low speed data streams to be added to the output for purposes such as DTA channel mapping and code

upload.

SDE24

Each SDE24 module contains two encoders and if MPEG2 encoding is desired for two programs, two MPEG2

transport streams can be generated. If MPEG4, H.264 encoding is desired, each SDE24 module can encode one

program to an H.264 output stream. Another option is to encode one program in MPEG2 and the second program

in H.264. The SDE24 accepts either NTSC or PAL video inputs.

SDE24EAS

This is a specialized version of the SDE24 to be used, when EAS is needed, to encode the EAS program. EAS

mode is provided by one of 2 methods, or both.

1) By installing the SDE24EAS module in slot 6 of the EH24A. This module has only a single composite input instead of

the two inputs of the standard SDE24. It’s video and audio input will be provided by an external EAS contoller providing

a NTSC composite alert message. When EAS is activated, the transport stream, created by the SDE24EAS, replaces the

transport streams that were coming from the other encoder modules in the EH24A. All programs will then become

the EAS alert program. Only one SDE24EAS is required per headend. The alert can be encoded in either MPEG2 or

MPEG4/H.264. All programs will be the same.

2) SCTE18 mode. In this mode, when an EAS alert is activated, the EH24A will place the SCTE18 table into the transport

stream. The SDE24EAS will encode the alert program. SCTE18 capable receivers are told where to tune.

General Description

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DRAKE EH24 Instruction Manual Page 6