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[[Category:Usage Manual]]
 
 
== Introduction ==
 
== Introduction ==
  
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traditional GNU Radio blocks, if we stream N bytes into a block, there's no way of
 
traditional GNU Radio blocks, if we stream N bytes into a block, there's no way of
 
knowing the packet boundary. This might be relevant: Perhaps the modulator has to
 
knowing the packet boundary. This might be relevant: Perhaps the modulator has to
prepend a synchronization word before every packet or append a CRC. So while some
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prepend a synchronisation word before every packet, or append a CRC. So while some
 
blocks don't care about packet boundaries, other blocks do: These are tagged
 
blocks don't care about packet boundaries, other blocks do: These are tagged
 
stream blocks.
 
stream blocks.
  
 
These blocks are different from all the other GNU Radio block types (gr::block,
 
These blocks are different from all the other GNU Radio block types (gr::block,
gr::sync_block etc.) in that they are driven by the input: The PDU length tag tells the block how to operate, whereas other blocks are output-driven (the scheduler tries to fill up the output buffer as much as possible).
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gr::sync_block etc.) in that they are driven by the input: The PDU length tag tells the block how to operate, whereas other blocks are output-driven (the scheduler tries to fill up the output buffer are much as possible).
  
 
=== How do they work? ===
 
=== How do they work? ===

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