[Cesg-all] CCSDS Review of CCSDS 121.0-P-1.1, Lossless Data Compression

[CCSDS Rapporteur]

Control Number: PRP 11-27

The following draft CCSDS Recommended Standard has been placed on 
line for CCSDS Agency review:

      CCSDS 121.0-P-1.1.  Lossless Data Compression.  Pink Sheets.
                          September 2011.

DOCUMENT DESCRIPTION:  This Recommendation defines a source-coding 
data-compression algorithm and specifies how data compressed using 
the algorithm are inserted into source packets for retrieval and 
decoding.  This draft update
- increases the allowed values of block length J from {8, 16} to {8, 
16, 32, 64};
- increases the maximum allowed value of the reference sample 
interval r from 256 to 4096;
- allows the use of a restricted set of code options;
- defines a new subfield of the Source Configuration Field of the 
optional Compression Identification packet;
- adds guidance for selection of code option when two or more code 
options gave the same performance for a block;
- clarifies that the ID bits are to be included when selecting the 
coding option for a block;
- updates nomenclature subsection;
- clarifies some text;
- adds a dedication to Warner Miller.

The due date for receipt of review comments by the Review Coordinator 
is 2011-11-21.  Area Directors and WG/BOF Chairs may submit review 
comments directly to the CCSDS Review Coordinator.  More information 
is available at the Web site identified below.

The review document, in Portable Document Format (PDF), and 
associated review materials are available for downloading at the 
following location:

      http://public.ccsds.org/review/

NOTES

1  Per CMC Action Item CMC-A-2007-10-05, agency reviewers are reminded to
    review for compliance with the CCSDS Publications Manual as well as
    technical content.

2  Per CESG Resolution CESG-R-2008-10-006, the CESG no longer conducts
    pre-Agency-review reviews but is instead expected to participate in
    Agency reviews when they are announced.