[Sls-slp] Re: USLP Header options (brainstorming again)

[Kazz, Greg J (312B)]

Hi G.P.,

I have my opinion of your suggestion but I don’t want to state it here, so others can think about it.
Please SLP WG, please share your view with all, if you have one.

Thanks!
Greg Kazz
Chairman CCSDS SLP WG

From: "Gian.Paolo.Calzolari at esa.int<mailto:Gian.Paolo.Calzolari at esa.int>" <Gian.Paolo.Calzolari at esa.int<mailto:Gian.Paolo.Calzolari at esa.int>>
Date: Wednesday, October 14, 2015 at 3:33 AM
To: "Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov<mailto:greg.j.kazz at jpl.nasa.gov>>
Subject: Fw: USLP Header options (brainstorming again)

Any meditation about this?

----- Forwarded by Gian Paolo Calzolari/esoc/ESA on 14/10/2015 12:32 -----

From:        Gian Paolo Calzolari/esoc/ESA
To:        "Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov<mailto:greg.j.kazz at jpl.nasa.gov>>,
Date:        21/09/2015 10:24
Subject:        Re: USLP Header options (brainstorming again)
________________________________


Greg, after the brainstorming below I thought that an effort shall be made to keep contiguous the fields for version + SCID + VCID .
Less important may be the MAP ID but worth discussing.

If USLP would be allowed to use two frame version there could be a version with 12 bits SCID and a version with 20 bits SCID (actaullay 1 bit less if we use 5 bits for frame version; i.e. 4 bit + subversion).

This is brainstorming again but it may be worthdiscussing it widely.

Regards

Gian Paolo


From:        Gian Paolo Calzolari/esoc/ESA
To:        "Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov<mailto:greg.j.kazz at jpl.nasa.gov>>,
Date:        10/09/2015 10:19
Subject:        USLP Header options
________________________________


Greg, can you consider an option like this below for the first octets of the USLP header?
Clearly next fields would need to be rearranged.

Just brainstorming......

 Actually Transfer Frame sub Version Number bit 2
 could be spared (==> short SCID = 11 bits, long = 19 bits) if two values are possible within the first 4 bits.
Ciao
Gian Paolo
•        Transfer Frame Version Number (4 bits, mandatory);

•        Transfer Frame sub Version Number bit 1 (1 bit, mandatory);  frame length field -->  0= absent, 1 = present

•        Transfer Frame sub Version Number bit 2 (1 bit, mandatory);  SCID length -->  0= 10 bits , 1 = 18 bits

•        Two MSbits of Spacecraft ID (SCID)  (2 bits, mandatory);

•        Spacecraft ID (SCID)( 8 or 16 bits, mandatory); It depends on Transfer Frame sub Version Number bit 2

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