<font size=2 face="sans-serif">Dear CCSDS Colleague,</font>
<br><font size=2 face="sans-serif">This is a kind request to participate
with your Working Group(s) in the review of the Functional Resource Model
created by the CSS/CSTS WG. The review is based on a word document hosted
on CWE, review instructions and further explanations can be found inside
the document:</font>
<br><a href="https://cwe.ccsds.org/css/docs/CSS-CSTS/SANA/functional_resources_css_tier_1.docx?Web=1"><font size=2 color=blue face="sans-serif">https://cwe.ccsds.org/css/docs/CSS-CSTS/SANA/functional_resources_css_tier_1.docx?Web=1</font></a>
<br>
<br><font size=2 face="sans-serif">Optionally also the Functional Resource
Reference Model Magenta Book, accompanying the Functional Resource review
can be reviewed by including comments and changes in a copy:</font>
<br><a href="https://cwe.ccsds.org/css/docs/CSS-CSTS/SANA/FunctionalResourcesRefModel_MagentaBook-W-04-200717.docx?Web=1"><font size=2 color=blue face="sans-serif">https://cwe.ccsds.org/css/docs/CSS-CSTS/SANA/FunctionalResourcesRefModel_MagentaBook-W-04-200717.docx?Web=1</font></a>
<br>
<br><font size=2 face="sans-serif">The end of the review is 19th October
2020.</font>
<br>
<br><font size=2 face="sans-serif">Your review of the Functional Resources
will help ensure that inter-agency cross support is properly stated in
technical terms and will be much appreciated.</font>
<br>
<br><font size=2 face="sans-serif"><b>Background</b></font>
<br><font size=2 face="sans-serif">The Functional Resource Model (FRM)
defines, in abstract terms, the functions that a ground station performs
to provide Tracking, Telemetry and Command (TT&C) services to a spacecraft.
The goal is to arrive at a standard representation of TT&C services,
thereby facilitating standards for inter-agency cross support. The functions
are organized around logical strata including Aperture, Physical Channel,
Synchronization and Channel Coding, SLS Radiometric Data Production, Data
Transfer Services, SLS Data Delivery and Production and others. The
functions are defined via configuration parameters, monitored parameters,
notifiable events, and associated control directives. </font>
<br>
<br><font size=2 face="sans-serif"><b>Suggested review of Functional Resources
(FR) per Working Group (WG)</b></font>
<br>
<br><font size=2 face="sans-serif">A. <b>Space Link
Services </b></font>
<br><font size=2 face="sans-serif">1. <b>RF Modulation
WG </b></font>
<br><font size=2 face="sans-serif">a) Aperture FR Stratum</font>
<br><font size=2 face="sans-serif">1) RF Aperture FR
Set/ Antenna FR</font>
<br><font size=2 face="sans-serif">b) Physical Channel
FR Stratum</font>
<br><font size=2 face="sans-serif">1) CCSDS 401 Physical
Channel Transmission FR Set</font>
<br><font size=2 face="sans-serif">i.
CCSDS 401 Space Link Carrier Transmission
FR</font>
<br><font size=2 face="sans-serif">ii.
Ranging Transmission FR</font>
<br><font size=2 face="sans-serif">2) CCSDS 401 Physical
Channel Reception FR Set</font>
<br><font size=2 face="sans-serif">i.
CCSDS 401 Space Link Carrier Reception
FR</font>
<br><font size=2 face="sans-serif">ii.
Range and Doppler Extraction FR</font>
<br><font size=2 face="sans-serif">2. <b>Space Link
Coding & Synchronization WG </b></font>
<br><font size=2 face="sans-serif">a) Synchronization and
Channel Coding FR stratum</font>
<br><font size=2 face="sans-serif">1) TC Synchronization
and Channel Encoding FR Set/ TC PLOP, Synchronization and Channel Encoding
FR</font>
<br><font size=2 face="sans-serif">2) Fixed Length
Frame Synchronization, Channel Encoding, and OID Generation FR Set/ Fixed
Length Frame Synchronization, Channel Encoding, and OID Generation FR</font>
<br><font size=2 face="sans-serif">3) Fixed Length
Frame Synchronization and Channel Decoding FR Set/ Fixed Length Frame Synchronization
and Channel Decoding FR</font>
<br><font size=2 face="sans-serif">3. <b>Space Link
Protocols WG</b> </font>
<br><font size=2 face="sans-serif">a) Space Link Protocol
FR stratum</font>
<br><font size=2 face="sans-serif">1) TC Space Link
Protocol Transmission FR Set</font>
<br><font size=2 face="sans-serif">i.
TC Master Channel (MC) Multiplexing
FR</font>
<br><font size=2 face="sans-serif">ii.
TC Virtual Channel (VC) Multiplexing FR</font>
<br><font size=2 face="sans-serif">2) AOS Space Link
Protocol Transmission FR Set</font>
<br><font size=2 face="sans-serif">i.
AOS MC Multiplexing FR</font>
<br><font size=2 face="sans-serif">ii.
AOS VC Multiplexing FR</font>
<br><font size=2 face="sans-serif">3) Fixed Length
Frame Unified Space Data Link Protocol Transmission FR Set</font>
<br><font size=2 face="sans-serif">i.
FLF USLP MC Multiplexing FR</font>
<br><font size=2 face="sans-serif">ii.
FLF USLP VC) Multiplexing FR</font>
<br><font size=2 face="sans-serif">4) TM/AOS Space
Link Protocol Reception FR Set</font>
<br><font size=2 face="sans-serif">i.
TM/AOS MC Demultiplexing FR</font>
<br><font size=2 face="sans-serif">ii.
TM/AOS VC Demultiplexing FR</font>
<br><font size=2 face="sans-serif"> </font>
<br><font size=2 face="sans-serif">B. <b>Space Internetworking
Services Area </b></font>
<br><font size=2 color=#4f4f4f face="sans-serif">1. </font><font size=2 face="sans-serif"><b>CCSDS
File Delivery Protocol Revisions WG</b> </font>
<br><font size=2 color=#4f4f4f face="sans-serif">a) </font><font size=2 face="sans-serif">SLS
Data Delivery Production FR Stratum/ CFDP File Data Production FR Set/
CFDP Entity FR</font>
<br><font size=2 face="sans-serif">C. <b>MOIMS Area
</b></font>
<br><font size=2 face="sans-serif">1.<b> Navigation
WG </b></font>
<br><font size=2 face="sans-serif">a) SLS Radiometric
Data Production FR Stratum/ Real-Time Radiometric Data Collection FR Set/
TDM Segment Generation FR</font>
<br><font size=2 face="sans-serif">b) Offline Data
Storage FR stratrum/ TDM Recording Buffer FR Set/ TDM Recording Buffer
FR</font>
<br><font size=2 face="sans-serif">c) Data Transfer
Services FR Stratum/Tracking Data CSTS FR Set/ Tracking Data CSTS Provider
FR</font>
<br><font size=2 face="sans-serif">D. <b>CSS Area</b></font>
<br><font size=2 face="sans-serif"><b>
</b>1. CSTS WG</font>
<br><font size=2 face="sans-serif">
a)
Frame Data Sink</font>
<br><font size=2 face="sans-serif">b)
Offline Frame Buffer</font>
<br><font size=2 face="sans-serif">c)
F-CLTU</font>
<br><font size=2 face="sans-serif">d)
FF-CSTS</font>
<br><font size=2 face="sans-serif">e)
RAF</font>
<br><font size=2 face="sans-serif">f)
RCF</font>
<br><font size=2 face="sans-serif">g)
ROCF</font>
<br><font size=2 face="sans-serif">h)
MD-CSTS</font>
<br>
<br>
<br><font size=2 face="sans-serif"><b>Some final notes</b></font>
<ol>
<li value=1><font size=2 face="sans-serif">Only the Master Channel and
VC Mux functions of the TC, AOS, TM, and Unified SLPs are covered by this
initial FR set. FRs representing the upper functions in these protocol
stacks will be covered in a (near?) future set of FRs</font>
<li value=2><font size=2 face="sans-serif">For USLP, only the Fixed Length
Frame (FLF) USLP Transmission FRs are covered in this initial set. FRs
representing the Variable Length Frame (VLF) USLP Transmission, VLF USLP
Reception, and FLF USLP Reception will be covered in a (near?) future set
of FRs</font>
<li value=3><font size=2 face="sans-serif">While we are asking specific
WGs to primarily review the FR Sets and FRs that are most associated with
the products of their WGs, we welcome comment on all contents of the candidate
FR registry and the FR Reference Model White Book.</font></ol>
<br><font size=2 face="sans-serif">Thank you for reading to the end.</font>
<br>
<br><font size=2 face="sans-serif">Best Regards,</font>
<br><font size=2 face="sans-serif">Holger Dreihahn</font>
<br>
<br><font size=2 face="sans-serif">Holger Dreihahn<br>
European Spacecraft Operations Centre | European Space Agency | S-431<br>
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