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In a generalisation of above concatenation, there are ''N'' possible inner codes ''I''<sub>''i''</sub> and the ''i''-th symbol in a codeword of ''C'' is transmitted across the inner channel using the ''i''-th inner code. The [[Justesen code]]s are examples of generalised concatenated codes, where the outer code is a [[Reed-Solomon code]].
== Simplified mathematical overview ==
In essence you have a datastream, typically composed of packets containing and obeaying the general process or function
* Packet = Outer Code (Inner Code(data))
That may or may not at some further point be defined as
* datastream = randomizer(Packet)
* datastream = interleaver(Packet)
With the randomizer or interleaver essentially performing the similar functions of removing any DC bias in datastream.
==Applications==
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