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Space Link Services Area

The Space Link Services Area (SLS) supports the work of the CCSDS by developing efficient space link communications systems common to all participating agencies.  A space link interconnects a spacecraft with its ground support system or with another spacecraft.  Agencies' new generations of space missions require telecommand and telemetry capabilities beyond current technologies.  These new needs are for higher data rates, better link performances, more performing ranging systems, together with lower cost, mass and power and higher security. 
 
More specifically, the SLS Area concentrates on layers 1 & 2 (of OSI protocol stack), namely: RF & modulation, channel coding and data link layer, for both long-haul (e.g.: spacecraft to ground) and proximity links (e.g.: orbiter to lander). Two additional functions are also covered by the SLS area: data compression for end to end data transfer optimization, and ranging for accurate orbit determination.  The area is composed of specialized working group whose objective is to develop specific recommendations. One recommendation will typically cover one OSI layer or sub-layer. This layering of recommendations maximizes flexibility and interoperability with other commercial protocols (e.g. : TCP/IP).
 
Note - All SLS publications are Numerical Order below.  With the exception of SLS Orange Books (Experimental Specifications), which can be viewed toward the bottom of this page. 

Icon CCSDS 100.0-G-1     
File size: 162,678 Bytes
Telemetry Summary of Concept and Rationale. Green Book. Issue 1. December 1987.
This Report presents the conceptual framework and rationale for the CCSDS Telemetry System. It provides background information supporting the two CCSDS technical Recommendations for Telemetry, Telemetry Channel Coding and Packet Telemetry.
Icon CCSDS 120.0-G-2     
File size: 876,585 Bytes
Lossless Data Compression. Green Book. Issue 2. December 2006.
This Report presents a summary of the key operational concepts and rationale underlying the requirements for the CCSDS Recommended Standard for Lossless Data Compression. Supporting performance information along with illustrations are also included. This Report also provides a broad tutorial overview of the CCSDS Lossless Data Compression algorithm and is aimed at helping first-time readers to understand the Recommended Standard. The current issue corrects minor errors in the original and updates obsolete information.
Icon CCSDS 120.1-G-1     
File size: 5,660,778 Bytes
Image Data Compression. Green Book. Issue 1. June 2007.
This Informational Report presents a summary of the key operational concepts and rationale which underlie the requirements for the CCSDS Recommended Standard, Image Data Compression (CCSDS 122.0-B-1).Supporting performance information along with illustrations are also included. This report provides a broad tutorial overview of the CCSDS Image Data Compression algorithm and is aimed at helping first-time readers to understand the Recommended Standard. For user test data, go here: http://cwe.ccsds.org/sls/docs/sls-dc/
Icon CCSDS 121.0-B-1     
File size: 256,280 Bytes
Lossless Data Compression. Blue Book. Issue 1. May 1997.
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 document has been reconfirmed by the CCSDS Management Council through November 2011. The current version of this document contains all updates through Technical Corrigendum 2, dated September 2007.
ISO Number : 15887
Icon CCSDS 121.0-B-1 Cor. 1     
File size: 84,329 Bytes
Technical Corrigendum 1 to CCSDS 121.0-B-1, Issued May 1997. Blue Book. Issue 1 Cor. 1. November 2006.
This Technical Corrigendum documents changes to CCSDS 121.0-B-1, Lossless Data Compression (Blue Book, Issue 1, May 1997)
Icon CCSDS 121.0-B-1 Cor. 2     
File size: 19,978 Bytes
Technical Corrigendum 2 to CCSDS 121.0-B-1, Issued May 1997. Blue Book. Issue 1 Cor. 2. September 2007.
This Technical Corrigendum documents changes to CCSDS 121.0-B-1, Lossless Data Compression (Blue Book, Issue 1, May 1997)
Icon CCSDS 122.0-B-1     
File size: 1,121,448 Bytes
Image Data Compression. Blue Book. Issue 1. November 2005.
This Recommended Standard defines an image-data compression algorithm applicable to digital data from payload instruments and specifies means to control compression rate and how these compressed data shall be inserted into source packets for retrieval and decoding. The downloadable file includes all updates through Corrigendum 2, issued July 2008. For user test data, go here: http://cwe.ccsds.org/sls/docs/sls-dc/
Icon CCSDS 122.0-B-1 Cor. 1     
File size: 74,397 Bytes
Technical Corrigendum 1 to CCSDS 122.0-B-1, Issued November 2005. Blue Book. Issue 1 Cor. 1. July 2006.
This Technical Corrigendum documents changes to CCSDS 122.0-B-1, Image Data Compression (Blue Book, Issue 1, November 2005).
Icon CCSDS 122.0-B-1 Cor. 2     
File size: 22,403 Bytes
Technical Corrigendum 2 to CCSDS 122.0-B-1, Issued November 2005. Blue Book. Issue 1 Cor. 2. July 2008.
This Technical Corrigendum documents changes to CCSDS 122.0-B-1, Image Data Compression (Blue Book, Issue 1, November 2005).
Icon CCSDS 130.0-G-2     
File size: 359,653 Bytes
Overview of Space Communications Protocols. Green Book. Issue 2. December 2007.
This Report provides an architectural overview of the space link protocols recommended by CCSDS and shows how these protocols are used in space mission data systems.
Icon CCSDS 130.1-G-1     
File size: 1,003,978 Bytes
TM Synchronization and Channel Coding--Summary of Concept and Rationale. Green Book. Issue 1. June 2006.
This Informational Report contains the concept and supporting rationale for the TM Synchronization and Channel Coding Recommended Standard and includes performance data and historical background information on code selection.
Icon CCSDS 130.2-G-1     
File size: 322,839 Bytes
Space Data Link Protocols--Summary of Concept and Rationale. Green Book. Issue 1. December 2007.
This CCSDS Informational Report contains background and explanatory material to support the CCSDS Recommended Standards on the TC, TM, and AOS Space Data Link Protocols and Communications Operation Procedure-1 that accompanies the TC Space Data Link Protocol.
Icon CCSDS 131.0-B-1     
File size: 1,614,482 Bytes
TM Synchronization and Channel Coding. Blue Book. Issue 1. September 2003.
This Recommendation contains specifications for synchronization and channel coding to be used on synchronous data channels. These specifications correspond with those contained in Telemetry Channel Coding.   (Note: This is a restructured Recommendation*.)
ISO Number : 22641
Icon CCSDS 132.0-B-1     
File size: 995,326 Bytes
TM Space Data Link Protocol. Blue Book. Issue 1. September 2003.
This Recommendation specifies the Data Link layer protocol, services, and procedures pertaining to the CCSDS Version-1 Synchronous Transfer Frame. These specifications correspond with the Data Link layer specifications contained in Packet Telemetry and Packet Telemetry Service Specification, respectively. (Note: This is a restructured Recommendation*.)
ISO Number : 22645
Icon CCSDS 133.0-B-1     
File size: 607,856 Bytes
Space Packet Protocol. Blue Book. Issue 1. September 2003.
This Recommendation specifies the protocols, services, and procedures pertaining to the CCSDS Packet. These specifications correspond with CCSDS Source Packet specifications contained in Packet Telemetry, Packet Telemetry Service Specification, Telecommand Part 3—Data Management Service, and Advanced Orbiting Systems, Networks and Data Links: Architectural Specification. (Note: This is a restructured Recommendation*.)
ISO Number : 22646
Icon CCSDS 133.1-B-1     
File size: 295,476 Bytes
Encapsulation Service. Blue Book. Issue 1. June 2006.
The CCSDS Recommended Standard for Encapsulation Service specifies a communications service to be used by space missions to transfer protocol data units that are not directly transferred by the Space Data Link Protocols over aground-to-space or space-to-space communications link.
Icon CCSDS 133.1-B-1 Cor. 1     
File size: 20,653 Bytes
Technical Corrigendum 1 to  CCSDS 133.1-B-1, Issued June 2006. Blue Book. Issue . October 2006.
This Technical Corrigendum documents changes to CCSDS 133.1-B-1, Encapsulation Service (Blue Book, Issue 1, June 2006).
Icon CCSDS 135.0-B-3     
File size: 275,860 Bytes
Space Link Identifiers. Blue Book. Issue 3. October 2006.
The CCSDS Recommended Standard for Space Link Identifiers documents the identifiers that are defined or reserved by CCSDS as part of the specification of the CCSDS space link protocols, and it shows how these identifiers are managed at the CCSDS level. The current issue adds a security subsection; adds protocol IDs for IPv4, Encapsulation Service, and Encapsulation Service Extended Protocol IDs; and expands and clarifies the meaning of the Proximity-1 port ID for Packets.The current version of this document contains all updates through Technical Corrigendum 1, dated March 2008
Icon CCSDS 135.0-B-3 Cor. 1     
File size: 23,773 Bytes
Technical Corrigendum 1 to CCSDS 135.0-B-3, Issued October 2006. Blue Book. Issue Issue 3 Cor. 1. March 2008.
This Technical Corrigendum documents changes to CCSDS 135.0-B-3, Space Link Identifiers (Blue Book, Issue 3, October 2006).
Icon CCSDS 200.0-G-6     
File size: 214,630 Bytes
Telecommand Summary of Concept and Rationale. Green Book. Issue 6. January 1987.
In order to establish a common framework within which the Agencies may develop standardized telecommand services, the CCSDS advocates adoption of a layered systems architecture. Within this approach, specific layers of service (including their operational protocol and data structuring techniques) may be selected for implementation according to mission requirements. The current layered set of CCSDS telecommand Recommendations was developed to match the conventional free-flying mission environment, as characterized by the transmission of command data at relatively low uplink data rates to spacecraft of moderate complexity. This Report summarizes the principal concepts associated with the CCSDS recommended space mission telecommanding architecture.
Icon CCSDS 210.0-G-1     
File size: 978,453 Bytes
Proximity-1 Space Link Protocol--Rationale, Architecture, and Scenarios. Green Book. Issue 1. August 2007.
This Report contains background and explanatory material to support the CCSDS Recommended Standards for Proximity-1 Space Link Protocol (CCSDS 211.0-B, CCSDS 211.1-B, and CCSDS 211.2-B).
Icon CCSDS 211.0-B-4     
File size: 867,623 Bytes
Proximity-1 Space Link Protocol--Data Link Layer. Blue Book. Issue 4. July 2006.
The CCSDS Recommended Standard for Proximity-1 Space Link Protocol--Data Link Layer specifies the protocol, services, and procedures pertaining to the CCSDS Version-3 Transfer Frame.
Icon CCSDS 211.1-B-3     
File size: 215,794 Bytes
Proximity-1 Space Link Protocol--Physical Layer. Blue Book. Issue 3. March 2006.
This Recommended Standard contains the Physical layer specification for Proximity space links.  It was originally published as part of CCSDS 211.0-B-1, Proximity-1 Space Link Protocol.  The current issue adds requirements for data rate offset and short- and long-term rate stability.
Icon CCSDS 211.2-B-1     
File size: 573,984 Bytes
Proximity-1 Space Link Protocol—Coding and Synchronization Sublayer. Blue Book. Issue 1. April 2003.
This Recommendation specifies Proximity space links. This Recommendation contains the Coding and Synchronization Sublayer specification originally published as part of CCSDS 211.0-B-1, Proximity-1 Space Link Protocol.
Icon CCSDS 230.1-G-1     
File size: 696,803 Bytes
TC Synchronization and Channel Coding--Summary of Concept and Rationale. Green Book. Issue 1. June 2006.
This Informational Report contains the concept and supporting rationale for the TC Synchronization and Channel Coding Recommended Standard and includes performance data and historical background information on code selection.
Icon CCSDS 231.0-B-1     
File size: 536,857 Bytes
TC Synchronization and Channel Coding. Blue Book. Issue 1. September 2003.
This Recommendation contains specifications for synchronization and channel coding to be used by space missions on asynchronous communications links. These specifications correspond with those contained in Telecommand Part 1—Channel Service. (Note: This is a restructured Recommendation*.) The current version of this document contains all updates through corrigendum 1.
ISO Number : 22642
Icon CCSDS 231.0-B-1 Cor. 1     
File size: 13,527 Bytes
Technical Corrigendum 1 to CCSDS 231.0-B-1, Issued September 2003. Blue Book. Issue 1. June 2006.

Icon CCSDS 232.0-B-1     
File size: 1,275,562 Bytes
TC Space Data Link Protocol. Blue Book. Issue 1. September 2003.
This Recommendation specifies the protocol, services, and procedures pertaining to the CCSDS Version-1 Asynchronous Transfer Frame. These specifications correspond with the Data Link layer specifications contained in Telecommand Part 2—Data Routing Service. (Note: This is a restructured Recommendation*.)
ISO Number : 22664
Icon CCSDS 232.1-B-1     
File size: 1,501,755 Bytes
Communications Operation Procedure-1. Blue Book. Issue 1. September 2003.
This Recommendation specifies the Communications Operation Procedure-1 used by the TC Space Data Link Protocol. This specification corresponds with that of Telecommand Part 2.1—Command Operation Procedures.   (Note: This is a restructured Recommendation*.)
ISO Number : 22667
Icon CCSDS 301.0-B-3     
File size: 230,826 Bytes
Time Code Formats. Blue Book. Issue 3. January 2002.
This Recommendation establishes a common framework and provides a common basis for the formats of time code data.
ISO Number : 11104
Icon CCSDS 320.0-B-5     
File size: 333,705 Bytes
CCSDS Global Spacecraft Identification Field Code Assignment Control Procedures. Blue Book. Issue 5. September 2007.
This procedural Recommendation establishes control procedures for Spacecraft Identification (SCID) codes.  As such, it defines the procedure governing assignment, use, relinquishment, and management of SCIDs.  This Recommendation also provides a list of the CCSDS Agencies' Representatives as of the date of this document and a form for requesting and relinquishing SCIDs.
Icon CCSDS 401.0-B-19     
File size: 2,249,372 Bytes
Radio Frequency and Modulation Systems--Part 1: Earth Stations and Spacecraft. Blue Book. Issue 19. July 2008.
Numerous concise recommendations appear in the notebook volume bearing the number 401.0-B.  Each recommendation is dated, and the most recent revision is shown in the table of contents. These Recommendations are developed for conventional near-Earth and deep-space missions having moderate communications requirements. The current issue updates recommendations 2.2.3, 2.4.2, 2.4.17A, and 2.4.17B, and deletes references to CCSDS 412.0-G-1.
Icon CCSDS 413.0-G-1     
File size: 2,774,755 Bytes
Bandwidth-Efficient Modulations: Summary of Definition, Implementation, and Performance. Green Book. Issue 1. April 2003.
This Report contains technical material to supplement the CCSDS Recommendations for the standardization of modulation methods for high symbol rate transmissions generated by CCSDS Member Agencies.
Icon CCSDS 700.0-G-3     
File size: 179,002 Bytes
Advanced Orbiting Systems, Networks and Data Links: Summary of Concept, Rationale and Performance. Green Book. Issue 3. November 1992.
This CCSDS Report contains background and explanatory material to supplement the CCSDS Recommendation, Advanced Orbiting Systems, Network and Data Links: Architectural Specification, 701.0-B-2.
Icon CCSDS 732.0-B-2     
File size: 598,847 Bytes
AOS Space Data Link Protocol. Blue Book. Issue 2. July 2006.
The CCSDS Recommended Standard for AOS Space Data Link Protocol specifies the protocol, services, and procedures pertaining to the CCSDS Version-2 Transfer Frame.   The current issue defines two new subfields within the Transfer Frame Primary Header Signaling Field: a Virtual Channel (VC) Frame Count Cycle Use Flag and a VC Frame Count Cycle subfield, effectively extending the VC Frame Count from 24 to 28 bits.
Icon CCSDS A31.0-G-1     
File size: 83,715 Bytes
Unique Identification of CCSDS Objects and Services. Green Book. Issue 1. June 2000.
This Report defines the highest-level CCSDS identifiers available to distinguish among types of CCSDS-defined objects and services at the CCSDS level, and it describes howto construct unique identifiers in the larger context of International Organization for Standardization (ISO) and International Telegraph and Telephone Consultative Committee (CCITT) identifiers.
Icon CCSDS B20.0-Y-2     
File size: 37,387,997 Bytes
Proceedings of the CCSDS RF and Modulation Subpanel 1E on Bandwidth-Efficient Modulations. Yellow Book. Issue 2. June 2001.
This Report consists of comparative and technical studies prepared for CCSDS Subpanel 1E concerning bandwidth-efficient modulations. These studies were conducted to evaluate existing and new technologies in an effort to improve RF communication channel efficiencies.

Space Link Services Orange Books (Experimental Specifications)

Icon CCSDS 131.1-O-2     
File size: 1,309,475 Bytes
Low Density Parity Check Codes for Use in Near-Earth and Deep Space. Orange Book. Issue 2. September 2007.
This CCSDS Experimental specification is a NASA contribution to the CCSDS Space Link Coding and Synchronization Working Group.  The document describes a set of Low Density Parity Check (LDPC) codes, including definition of their code structures, encoder implementations and experimental performance results.
Icon CCSDS 131.2-O-1     
File size: 779,262 Bytes
Flexible Serially Concatenated Convolutional Turbo Codes with Near-Shannon Bound Performance for Telemetry Applications. Orange Book. Issue 1. September 2007.
This Experimental Specification describes a new coding/modulation scheme that provides a wide range of spectral efficiency values that can be reconfigured without interrupting the data transfer over the physical channel. The implementation of the encoder can be realized with certain degrees of parallelism without any significant increase in memory or computation requirements. This feature makes the scheme attractive in particular for on-board implementation.

  * Restructured Recommendation Information
** SCPS Information

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