[CMC Alert] CCSDS Review of CCSDS 121.0-P-1.1, Lossless Data Compression

[CCSDS Rapporteur]

Control Number: RP 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 Agency review comments by the Review 
Coordinator is 2011-11-21.  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/

REMINDER:  Agency Heads of Delegation are to make their own 
arrangements for review participation by their Agency-sponsored Associates.

NOTE: 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.