7.5 ASI I/O Option Card
7.5.1 Overview
The ASI I/O option card provides two asynchronous serial input and two
asynchronous serial output interfaces which conform to Part 9 of
CENELCE EN 50083-9, subclause 4.3 and can transmit DVB/MPEG-2 Transport
Streams up to a rate of 270 Mbps.
The ASI option card uses the 27 MHz System Clock Reference (SCR) signal from
the base chassis as its frequency reference. The output bit rate of the ASI Card is
configurable up to 150 Mbps. The module automatically configures Burst or Byte
Mode. For a Transport Stream rate less than 70 Mbps, packets are sent in Byte
Mode. Above 70 Mbps Burst Mode is used.
Figure 7.5 ASI I/O Option Card
7.5.2 Interfaces
The ASI I/O option card has the following interfaces:
• Two 75 Ω female BNC input connectors.
• Two 75 Ω female BNC output connectors.
The input connectors are used for feeding the unit with external Transport Streams
to be passed through to an output.
The output connectors can be configured as a mirrored output pair (with the same
Transport Stream on both outputs) or two independent outputs (with different
Transport Streams on each output).
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