Ensemble Designs 4500 ASI and SMPTE 310M Converter and MPEG Transport Processor - Manual (Page 8)

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Model 4500 MPEG Stream Processor
As a transport stream arrives at the input of the Avenue 4500, the signal is deserialized and the Data
packets are saved into a buffer. The Null packets are discarded.
Guided by a reference clock, Data packets are read from the buffer. Null packets are inserted as needed
to bring the total bit rate up to 19.39 Mb/s. The packets are then serialized, using that reference clock,
as either a DVB-ASI or SMPTE 310M signal. All of the original Data is preserved, but the clocks are all
new.