Project Title

Unified Space Data Link Protocol Blue Book Issue 2



Document Number



5.04 Space Link Protocols Working Group

Document Type


Description of Document

The SLP WG has been collecting updates to the version 1 Blue book and has accumulated a critical number of changes to warrant the release of a new version. These changes include to a great extent but are not limitied to: o limit the Frame Error Control Field options to CRC-16 (i.e. removing CRC-32 option), o clarify the way USLP interfaced to TC Coding Layer, o clarify options about USLP Truncated transfer Frames, o clarify applicability of COP-1 and COP-P, o clarify usage of AD and BD Frames when COP-1 is applied

Applicable Patents

There are no patent issues for this technology that are known by the CCSDS community

Patent Comments


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

This is a new issue of an existing Blue book.


Book Editor


Book Editor Resources

.1 FTE for Book Editor

Prototype 1

Not Required

Prototype 1 Resources

Since these updates resolve ambiguities in the existing blue book and only limit the existing options, there is no need for additional prototyping.

Prototype 2

Not Required

Prototype 2 Resources

Prototype 3

Not Required

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.)
(Date in M/D/YYYY format.)
Project ApprovedOrange BulletGreen BulletMagenta BulletBlue Bullet11/11/2020CMC-P-2020-11-003
Project Start DateOrange BulletGreen BulletMagenta BulletBlue Bullet11/16/2020
Internal WG Review
First Draft Circulated to WGOrange BulletGreen BulletMagenta BulletBlue Bullet12/16/2020
First Draft Comments DueOrange BulletGreen BulletMagenta BulletBlue Bullet2/1/2021
Second draft circulated to WGOrange BulletGreen BulletMagenta BulletBlue Bullet4/21/2021
Second Draft Comments DueOrange BulletGreen BulletMagenta BulletBlue Bullet7/14/2021
Final WB Submitted to AD for Further ProcessingOrange BulletGreen BulletMagenta BulletBlue Bullet9/8/2021
External Milestones
Secretariat Document ProcessingOrange BulletGreen BulletMagenta BulletBlue Bullet10/8/2021
First Agency ReviewMagenta BulletBlue Bullet11/10/2021
RID ResolutionMagenta BulletBlue Bullet12/15/2021
Secretariat Document Processing 2Magenta BulletBlue Bullet1/19/2022
Final Agency ReviewMagenta BulletBlue Bullet3/16/2022
RID ResolutionMagenta BulletBlue Bullet5/18/2022
First Prototype DevelopmentBlue Bullet5/18/2022Not applicable because updates are clarifications only
Second Prototype DevelopmentBlue Bullet5/18/2022Not applicable because updates are clarifications only
CMC ApprovalOrange BulletGreen BulletMagenta BulletBlue Bullet6/15/2022
Total Time to Complete
(in months)
Version: 141.0
Created at 10/27/2020 3:22 PM by Greg Kazz
Last modified at 10/31/2021 1:56 PM by Laura Stafford