Cisco GoQAM Installation And Operation Manual page 24

Chapter 1 Introducing the GoQAM
Stage Description
8 The I/O board directs the transport stream to one of the two RF Agile output
converters and sends the signal through the RF network to the DHCTs.
This section provides the installation process and lists the detailed procedures in this
guide that correspond with each process step.
Important: To ensure proper installation, read this entire guide before starting
installation and then follow these processes in the order shown.
Input/Output Diagram (IF Version)
The following diagram illustrates the stages of the input/output (I/O) process for
the IF GoQAM.
Note: The stage numbers correspond with the following table.
Input/Output Stage/Description Table
The following table describes the stages of the I/O process of the IF GoQAM. The
numbers correspond to the above I/O diagram.
Stage Description
1 A pair of transport streams (a clear version and a third-party encrypted
version of the same stream) are input to the GoQAM.
2 The digital I/O board timestamps the MPEG packets in each stream, then
filters and routes them according to their PID values.
3 The digital I/O board selects the packets to pass from both the clear and
third-party encrypted streams.
4 PowerKEY encryption is added to selected clear packets and PID values
are remapped.
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