TPT/Fastload network data format

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TPT/Fastload network data format

What is the data format using by TPT\Fastload while primary transfer to Teradata instance?

We using Fixed-width source-files for fasload - its a really excessive data (higly compressible).

Does Fastload (or TPT) use a custom format for transmission to the lower coefficient of redundancy,

or even some kind of packing? Or it transfers data to db-side as-is?