Drake EH24A/EH24A ASI - Manual (Page 7)

Features 7
EH24A Features
The EH24A encoder host platform is a 19’’ rack mountable chassis that is 2 RU tall and can accept up to six modules that are
inserted into slots via the rear panel.
SD Encoding:
The SDE24/SDE24A is the SD dual encoder module. Up to six of these modules could be installed in
the EH24A. Programs can be encoded in MPEG2 or MPEG4/H.264 (AVC). Audio is encoded using a choice of Dolby Digital
encoding or MPEG1, layer 2 (MP2)encoding.
***IMPORTANT NOTICE***
When installing the SDE24A in an EH24A host chassis (stock # 1002510A), the EH24A must have firmware version 3.0 or
higher. Should you require any technical assistance, please contact DRAKE Service at (937) 746-6990.
EAS Message Encoding:
If EAS is to be utilized, then up to 10 SD MPEG2 programs or 5 SD H.264 programs, or a mix,
may be encoded in each EH24A/EH24A in addition to an EAS message program that is encoded in slot 6 of just one ‘master’
EH24A. One SDE24EAS is required per headend to be installed in the ‘master’ EH24A. Additional ‘slave’ EH24As can be
included via simple ASI looping through each EH24A using an ASII card in slot 6 of all slave EH24As. The EH24A supports
the emergency alert system in two ways. SCTE18 table support is provided and also substitution of normal program
video with EAS program video, on all EH24A encoded program PIDs, is provided. Either method or both may be operator
selected.
Program Filtering and Multiplexing:
The EH24A contains transport stream multiplexers that can multiplex any or all
of the program streams from the encoders. The user may select what programs from the encoders to include in the QAM
output channel and also the user can select, independent of the QAM output, what programs to output via the DVB-ASI
port. The QAM RF output can be specified for either off-air or CATV frequency plans in the 54 to 1002 MHz spectrum. The
EH24A and installed encoder modules are powered by a built in power supply.
DTA Data Support:
One input slot in an EH24A can be used to input low speed data via ASI that may be used by system
DTAs (Digital Transport Adapters). A Drake created PC program can be used to generate the data that would be then input
to the EH24A. This data generates a transport stream to provide a channel map (SCTE65 tables) for the DTAs. Also, firmware
update data can be sent to the DTAs if needed.
ASII:
The Drake model ASII input module is supported to provide an ASI input for slave EAS operation and for DTA
data input as described in previous paragraphs.