User`s guide

Functional Overview
5–10 MS-4900, Rev. A
Figure 5-4. Reed-Solomon Model, Functional Depiction
Time-Division
Demultiplexer
(TDD)
After the signal has been demodulated and passed through error-correction, the
aggregate data stream moves into the time-division demultiplexer, or the TDD. The
TDD separates the data stream into partitions. These partitions include the
following:
• the CPU data partition (transparent asynchronous or stat mux data) that is
passed to the processor for output to Serial 1 (and for stat mux data, possibly to
Serial 2, 3, and 4, as well).
• two additional partitions funneled directly for output through Serial 5 (and
Serial 4, if configured at the factory for synchronous output).
• a network control channel directed to the processor that includes non-
displayable, internal control data only.
The network control channel occupies a pre-assigned portion of the aggregate data
stream. The control channel is used to modify settings within the receiver, as in the
case of first-time setup or when the NCC needs to dynamically change a frequency
setting for a group of receivers, or to suspend output on a given serial port.
Processor
In this description, the processor includes the CPU, random access memory, and
flash memory. The processor board contains one serial output port (Serial 1),
available for asynchronous data output.
The processor controls other components within the receiver and provides statistical