Service Filtering - Adtec RD-71 User Manual

Service Filtering

Terminology:
TS - Transport Stream - A stream of transport packets that contain audio, video and data
belonging to one (SPTS, single program transport stream, also known as SCPC.) or several
programs (MPTS, multiple program transport stream, also known as MCPC.).
PAT - Program Association Table. This MPEG-2 table lists all the programs contained in the
transport stream and shows the PID value for the PMT associated with each program. The
PAT is always found on PID 0x0000.
PMT - Program Map Table. This MPEG-2 table specifies PID values for components of
programs.
PID - Packet Identifier. This unique integer value identifies elements in the transport stream
such as tables, data, or the audio for a specific program.
Program / Service / Channel - A combination of one or more elements (video, audio or data)
defined by a PMT.
Summary:
Service Filtering allows an MPTS from the input to be turned into an SPTS or program
reduced MPTS on a given output. This is helpful in service turn around applications where
all programs are not desired for re-transmission. An example of 5 MPTS to a smaller MPTS
output is shown below.
The Adtec RD-71 also has the ability to route Inputs to Outputs, such as route RF2 Input to
ASI Output while decoding from RF1. The Service Filter control must be ENABLED for
routing to function. The RD-71 does ​ n ot support multiplexing of the inputs. A block
diagram of the input routing and filtering is shown below.
Input to Output Routing and Filtering
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