[SIS-CFDPV1] CFDP unbounded transfers

[Wiegand, Robert E. (GSFC-5830)]

Greetings,

I have a comment/question regarding unbounded file transfers.

CCSDS 727.0-B-5 says in Table 5-1: Fixed PDU Header Fields

... All files of unbounded size shall be flagged 'large'...

If the sender can ensure the unbounded file being transferred will be of size < 4GB, why must the sender/receiver use FSS size 64 bits for all PDUs?

Disadvantages:

  *   each FDU 32 bits larger;
  *   NAK sequence nearly doubles in size;
  *   hardware/software built for 32 bit FSS cannot use unbounded file transfers

I am not seeing advantages that cannot be addressed without this constraint.

Any thoughts or explanation?

thank you
bob

--
Bob Wiegand
Ground Software Systems Branch
NASA/GSFC Code 583


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