[SIS-CFDPV1] CFDP unbounded transfers

[Felix Flentge]

Hi Bob,

I tend to agree that we should also allow 'small' unbounded files without FSS if the sender ensures that they will be < 4GB.

If  there are no objections, I will integrate this change in my B6 draft.

Regards,
Felix

From: SIS-CFDPV1 <sis-cfdpv1-bounces at mailman.ccsds.org> On Behalf Of Wiegand, Robert E. (GSFC-5830) via SIS-CFDPV1
Sent: Friday, October 6, 2023 5:09 PM
To: sis-cfdpv1 at mailman.ccsds.org
Subject: [SIS-CFDPV1] CFDP unbounded transfers

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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