Wegener UNITY4000, Instruction Manual

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UTY4000-003 2-4
Table 2-2. QPSK Demodulator Requirements
Inner Code Rate Symbol Rate Transport Rate Threshold Eb/No
1/2 2.71-30 Msps 2.5-27.647 Mbps 4.0
2/3 2.04-30 Msps 2.5-36.863 Mbps 5.0
3/4 1.81-30 Msps 2.5-41.471 Mbps 5.5
5/6 1.63-30 Msps 2.5-46.078 Mbps 6.0
7/8 1.55-30 Msps 2.5-48.382 Mbps 6.4
2.3.3 Transport DEMUX
The transport demux is used to extract the desired video and audio streams from the multiplexed
data stream.
2.3.4 System Processor
The main system processor is an extended architecture processor, and uses flash memory for
microcode storage with download capability via either terminal or satellite channel.
The unit also has an MPEG2 video processor ASIC, and an audio processor ASIC.
2.3.5 Auxiliary Data Processing
An asynchronous user-data stream embedded in the transport stream may be routed to SERIAL 1
or SERIAL 2 ports under user or network control. The controller need merely suply the PID of
the MPEG packets bearing the data and the output baud rate.
2.3.6 Composite Video Encoder
The IRD supports the video resolutions given in Table 2-3. The unit automatically senses the
format (NTSC or PAL) and reconfigures the video decompression system accordingly.
Table 2-3. Video Resolution Requirements
NTSC PAL
704H x 480V (Full Resolution) 704H x 576V
544H x 480V (3/4 Resolution) 544H x 576V
480H x 480V 480H x 576V
352H x 480V (1/2 Resolution) 352H x 576V
352H x 240V 352H x 288V