Project Title

Lossless Data Compression, Issue 2


Document Number



5.03 Data Compression Working Group

Document Type


Description of Document

Issue 2 of CCSDS 121.0-B "Lossless Data Compression." Extends the range of two parameters of the compression standard, defines a simpler mode for low bit-depth data, and augments the headers to accommodate the newly introduced functionality. The underlying compression algorithm is the same.

Applicable Patents

Patent issues have been identified but appropriate ISO forms have not yet been signed. The WG requests a waiver to begin work on this project. (justify in comments). ISO forms must be secured prior to the first formal Agency review.

Patent Comments

US patent 5,448,642 applies to 'second extension coding' method (which was also part of Issue 1 of this standard). However, in 2009, NASA decided to abandon this patent.

Survey of Similar Standards
Documents or Projects
Undertaken in Other Bodies
and elsewhere in CCSDS


Book Editor

Book Editor Resources

Prototype 1

Prototype 1 Resources

Prototype 2

Prototype 2 Resources

Prototype 3

Prototype 3 Resources


Monitor Only

Resource Comments


Legend for Schedule Milestones
Orange Bullet = Required for Orange Books
Green Bullet = Required for Green Books
Magenta Bullet = Required for Magenta Books
Blue Bullet = Required for Blue Books
Note - Red Books are Draft Blue/Magenta Books

Schedule Milestones
Orange BookGreen BookMagenta BookBlue Book
Original Completion Date
(Date in M/D/YYYY format.)
Estimated Completion Date
(Date in M/D/YYYY format.)
Actual Completion Date
(Date in M/D/YYYY format.)
(Date in M/D/YYYY format.)
Project ApprovedOrange BulletGreen BulletMagenta BulletBlue Bullet10/1/201010/1/201010/1/2010
Project Start DateOrange BulletGreen BulletMagenta BulletBlue Bullet
Internal WG Review
First Draft Circulated to WGOrange BulletGreen BulletMagenta BulletBlue Bullet11/24/201011/24/201011/24/2010
First Draft Comments DueOrange BulletGreen BulletMagenta BulletBlue Bullet3/1/20113/1/20113/1/2011
Second draft circulated to WGOrange BulletGreen BulletMagenta BulletBlue Bullet3/24/20113/24/20113/24/2011
Second Draft Comments DueOrange BulletGreen BulletMagenta BulletBlue Bullet5/6/20115/6/20115/6/2011
Final WB Submitted to AD for Further ProcessingOrange BulletGreen BulletMagenta BulletBlue Bullet5/27/20115/27/20115/27/2011
External Milestones
Secretariat Document ProcessingOrange BulletGreen BulletMagenta BulletBlue Bullet7/27/20117/27/20119/20/2011CMC-P-2011-09-002 Authorized Agency review
First Agency ReviewMagenta BulletBlue Bullet10/27/201111/21/201111/21/2011Review closed on 2011-11-21
RID ResolutionMagenta BulletBlue Bullet1/15/20121/15/201212/19/2011Delivered RID resolutions to editor & area director
Secretariat Document Processing 2Magenta BulletBlue Bullet2/15/20122/15/20122/15/2011
Final Agency ReviewMagenta BulletBlue Bullet5/15/20125/15/20125/15/2011
RID ResolutionMagenta BulletBlue Bullet7/15/20127/15/20127/15/2011
First Prototype DevelopmentBlue Bullet12/1/201212/1/201212/1/2011
Second Prototype DevelopmentBlue Bullet12/2/201212/2/201212/2/2011
CMC ApprovalOrange BulletGreen BulletMagenta BulletBlue Bullet8/15/20128/15/20125/16/2012Posted to CCSDS Publication Area
Total Time to Complete
(in months)
Version: 115.0
Created at 7/21/2011 7:11 PM by Kiely Aaron
Last modified at 12/2/2013 5:05 PM by CCSDS Tech Support