Справочник Пользователя для Integrated Microwave Technologies LLC. 25VST-AMP
25VST-AMP
User Manual
Revision 1.0
12
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USB Interface for Firmware Updates
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Power Circuitry
COFDM Transmitter
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MPEG4 Video Compression Circuit
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Data Encryption Circuit
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COFDM Modulator
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Microwave Transmission Amplifier
Power Distribution
High Power Amplifier
2.2.2 Interface Board
2.2.2.1 Power and Control Interface Connector
The 25VST-AMP Power and Control Interface includes power and ground connections plus two RS-
232 serial port interfaces. One of the RS-232 interfaces can be connected to a laptop or other PC to
program the transmitter configuration. The second RS-232 interface can be used to transmit user data
through the transmitter along with the audio and video streams.
232 serial port interfaces. One of the RS-232 interfaces can be connected to a laptop or other PC to
program the transmitter configuration. The second RS-232 interface can be used to transmit user data
through the transmitter along with the audio and video streams.
2.2.2.2 Audio and Video Input Connectors
This 25VST-AMP model has two analog audio inputs that can be used for stereo audio and one NTSC
or PAL composite video input. Refer to Chapter 3 for specifications of these signals.
or PAL composite video input. Refer to Chapter 3 for specifications of these signals.
2.2.3 COFDM Transmitter
2.2.3.1 MPEG4 Encoder
The 25VST-AMP compresses the input video signal before modulation and transmission to reduce
bandwidth. The 25VST-AMP contains a built-in MPEG4 (H.264) compliant encoder for this purpose.
The 25VST-AMP features the latest compression methods utilizing B frames for more accurate
encoding of compressed video signals.
bandwidth. The 25VST-AMP contains a built-in MPEG4 (H.264) compliant encoder for this purpose.
The 25VST-AMP features the latest compression methods utilizing B frames for more accurate
encoding of compressed video signals.
2.2.3.2 Encryption
The transmitter supports BCRYPT1 and BCRYPT2. BCRYPT2 is very similar to BCRYPT1 with
improvements made to support re-multiplexing. Both encryption modes support AES 128 and AES256
key lengths.
improvements made to support re-multiplexing. Both encryption modes support AES 128 and AES256
key lengths.
Figure 2-2 - Encryption Circuit
2.2.3.3 COFDM Modulator
The COFDM modulator receives data from the output of the MPEG4 encoder through a circuit that
enhances the security of transmissions.
enhances the security of transmissions.