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Dear Xiongwen He,</div>
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As a member of NASA, I can answer any ambiguities you have with the CCSDS Proximity-1 Space Data Link standard. However, I cannot answer any questions concerning the implementation details of this CCSDS recommedation. However, I have included the entire Space
Link Protocol (SCP) working group mailing list, in case any of the members would like to answer or comment on your implementation related questions.</div>
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Please see my responses between **…** below.</div>
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Best regards,</div>
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Greg Kazz</div>
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Chairman CCSDS SLS-SLP WG</div>
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<span style="font-weight:bold">From: </span>he xiongwen <<a href="mailto:hexw501@hotmail.com">hexw501@hotmail.com</a>><br>
<span style="font-weight:bold">Date: </span>Saturday, September 10, 2016 at 2:52 AM<br>
<span style="font-weight:bold">To: </span>"Kazz, Greg J (313B)" <<a href="mailto:greg.j.kazz@jpl.nasa.gov">greg.j.kazz@jpl.nasa.gov</a>><br>
<span style="font-weight:bold">Subject: </span>Questions about Proximity -1 space data link protocol<br>
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<p>Dear Mr. <span>Greg Kazz,</span></p>
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<p><span> I am from China Academy of Space Technology(CAST), and we are trying to adopt Proximity -1 space data link protocol to CAST standard.During the process, we find that some issues are not very clear, and I am looking for help from you.</span></p>
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<p><span> (1) In the <span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">
Proximity -1 </span>data link layer recommendation, there is a description as follows</span></p>
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<div><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">“</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 12pt;">6.2.3.9
RECEIVING_SCID_BUFFER</span>
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RECEIVING_SCID_BUFFER shall be used in the frame validation process to compare a</div>
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received spacecraft ID value with that held within this buffer.<span style="color: rgb(255, 0, 0);"> This buffer may be loaded by</span></div>
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<span style="color: rgb(255, 0, 0);">a directive from the local vehicle controller</span>, or it may be loaded with the spacecraft ID</div>
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contained in the first valid received frame.”</div>
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<div>"6.7.2 FRAME VALIDATION</div>
<div>c) If the Spacecraft ID field in the transfer frame header does not contain the value equal</div>
<div>to the RECEIVING_SCID_BUFFER for all frames received (i.e.,</div>
<div><span style="color: rgb(255, 0, 0);">Remote_Spacecraft_ID</span>, MIB parameter) when the RECEIVING_SCID_BUFFER is</div>
<div>non-zero and the Source-or-Destination Identifier value equals ‘0’, i.e., source, and</div>
<div>Test_Source is true, a session violation has occurred and the vehicle controller is</div>
<div>notified (see annex D). </div>
<div><span style="font-size: 12pt;">When the RECEIVING_SCID_BUFFER is zero and</span><br>
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<div>Test_Source is true, the value of the SCID field in the header of the first received</div>
<div>frame whose Source-or-Destination ID is source is loaded into</div>
<div>RECEIVING_SCID_BUFFER and thereafter used for validation for the remainder of</div>
<div>the session. (See also related 6.2.4.2.)"</div>
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<div>The question is:</div>
<div>a) is <span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">RECEIVING_SCID_BUFFER always equal to <span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px; color: rgb(255, 0, 0);">Remote_Spacecraft_ID</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">,
MIB parameter?</span></span></div>
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** Not necessarily. The test mentioned above still needs to be made. Depends upon the topology of the network involved. **</div>
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<div><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">In
a situation "</span></span><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">When the RECEIVING_SCID_BUFFER is zero and</span><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">
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Test_Source is true, <span style="color: rgb(255, 0, 0);">but</span> the value of the SCID field in the header of the first received</div>
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frame whose Source-or-Destination ID is source <span style="color: rgb(255, 0, 0);">is not equal to</span> <span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">Remote_Spacecraft_ID</span>"</div>
will the SCID also be loaded to the <span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">RECEIVING_SCID_BUFFER? If not, what
actions will be taken? ** Yes. </span></span></span><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 12pt;">RECEIVING_SCID_BUFFER
is the recommended data store for this </span><font face="Calibri,Arial,Helvetica,sans-serif,Apple Color Emoji,Segoe UI Emoji,NotoColorEmoji,Segoe UI Symbol,Android Emoji,EmojiSymbols"><span style="font-size: 16px;">information **</span></font></div>
<div><font face="Calibri,Arial,Helvetica,sans-serif"><span style="font-size: 12pt;">b） </span></font><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Is </span><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">the
value </span><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Remote_Spacecraft_ID loaded to RECEIVING SCID BUFFER by using directive “SET RECEIVING SCID BUFFER” . ** Per paragraph 6.3.3.1.7 </span><span style="color: rgb(0, 0, 0); font-family: serif; font-size: 18.3px;">SET
RECEIVING SCID BUFFER</span>
<div data-canvas-width="246.716" style="left: 428.1px; top: 619.778px;"><font face="serif">shall be used by the vehicle controller to load the </font><span style="color: rgb(0, 0, 0); font-family: serif; font-size: 18.3px;">RECEIVING_SCID_BUFFER. When the value
of the SCID is known </span><font face="serif"><span style="font-size: 18px;">a priori, then the value in the Remote_<span style="font-style: italic;">Spacecraft_ID
</span>is used. When that value is not known a priori, then it can be determined by examining the SCID found in the first valid transfer frame received. </span></font></div>
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. </div>
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<span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"></span></span></span></span></div>
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<span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">On
what condition will this <span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">directive be used? **<span style="font-weight: bold;">
see answer immediately above</span>**</span></span></span></span></span></div>
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<span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><br>
</span></span></span></span></span></div>
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<span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">(2)
<span style="color: rgb(0, 0, 0);">in </span><span style="color: rgb(0, 0, 0);">Figure 5-1: Proximity Time Tag Recording</span></span></span></span></span></span></div>
<div style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">
<span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(255, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="color: rgb(0, 0, 0);">Is</span></span></span></span></span></span><span style="font-size: 12pt;"> </span><span style="font-size: 12pt;"> </span><span style="font-size: 12pt;">Proximity
Time Tag Recording process responsible for transfer the collection of <span>tags to <span>time Correlation Process? ** No. Please see note 5.3: </span></span></span><span style="font-family: serif; font-size: 20px;">NOTE</span></div>
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When time correlation data sets canbe transferred, the time correlation process can be performed. The actual implementation details of this process are outside the scope of this specification. **</div>
<div><font face="Calibri,Arial,Helvetica,sans-serif"><span style="font-size: 12pt;">Do you have any examples of </span></font><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"> </span><font face="Calibri,Arial,Helvetica,sans-serif,Apple Color Emoji,Segoe UI Emoji,NotoColorEmoji,Segoe UI Symbol,Android Emoji,EmojiSymbols"><span style="font-size: 16px;">time
Correlation Process, what do this process usually do ? **<span style="font-weight: bold;"> I cannot provide you with implementation examples</span>**</span></font></div>
<div><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;"><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">Is </span></span></span></span><font face="Calibri,Arial,Helvetica,sans-serif"><span style="font-size: 12pt;">Start
Time Tag Collection Process command sent by ground or by on board process?**</span></font><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; font-weight: bold;"> This is an implementation choice . No comment </span><font face="Calibri,Arial,Helvetica,sans-serif"><span style="font-size: 12pt;">**When
will the Initiator begin to collect the time tags? ** When the time tag activity is active </span><span style="font-size: 16px;">I</span><span style="font-size: 12pt;">.e., once the initiator has built and sent the SET CONTROL PARAMETERS directive per paragraph
5.2.6 **</span></font></div>
<div><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">How do the initiator know the </span><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">SET </span><font face="Calibri,Arial,Helvetica,sans-serif"><span style="font-size: 12pt;"></span></font><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">CONTROL </span><font face="Calibri,Arial,Helvetica,sans-serif"><span style="font-size: 12pt;"></span></font><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">PARAMETERS </span><font face="Calibri,Arial,Helvetica,sans-serif"><span style="font-size: 12pt;">directive
has been received by RESPONDER? ** Doesn</span><span style="font-size: 16px;">’</span><span style="font-size: 12pt;">t absolutely know if it was or was not received. But it doesn</span><span style="font-size: 16px;">’</span><span style="font-size: 12pt;">t
matter to the initiator. It will only supply what it can supply. If it receives transfer frames from the responder than it will also time tag those frames as well as the ones it is transmitting. It is a best efforts activity as specified in chapter 5. **</span></font></div>
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<span style="font-size: 12pt;"><span><br>
</span></span></div>
<div style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">
<span style="font-size: 12pt;"><span>(3) in <span>Figure 5-2: Transferring Time to a Remote Asset</span></span></span></div>
<div style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">
<span style="font-size: 12pt;"><span><span></span></span></span><span style="font-size: 12pt;">Between"Extract the enterprise time from</span></div>
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the TIME DISTRIBUTION directive</div>
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providing it to the responder’s</div>
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master clock" and the transfer of "<span style="font-size: 12pt;">TIME </span><span style="font-size: 12pt;">DISTRIBUTION </span><span style="font-size: 12pt;">directive</span>", is there any delay? I see the two arrows are connect directly in the figure. **
The figure is only notional and per CCSDS figures in blue books are not normative. Clearly there will be a time delay between extracting the time and providing it in directive form **</div>
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is the action <span style="font-size: 12pt;">"Extract the enterprise time from </span><span style="font-size: 12pt;">the TIME DISTRIBUTION directive </span><span style="font-size: 12pt;">providing it to the responder’s</span>
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<div>master clock" implemented by proximity-1 protocol or upper layer application? ** I can only say that this function is not in the scope of Proximity-1 Space Data Link Protocol **</div>
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<font face="Calibri,Arial,Helvetica,sans-serif"><span style="font-size: 12pt;">How does TIME DISTRIBUTION </span></font><font face="Calibri,Arial,Helvetica,sans-serif,Apple Color Emoji,Segoe UI Emoji,NotoColorEmoji,Segoe UI Symbol,Android Emoji,EmojiSymbols"><span style="font-size: 16px;">directive
initiated ? By ground command or on board command? ** This is an implementation choice. No comment. **</span></font></div>
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<span style="font-size: 12pt;"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><br>
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<span style="font-size: 12pt;"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">I would appreciated
if you could reply and help me clarify the questions. **Best regards, Greg Kazz **</span></span></span></span></span></div>
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<span style="font-size: 12pt;"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><br>
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<span style="font-size: 12pt;"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">Best Regards,</span></span></span></span></span></div>
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<span style="font-size: 12pt;"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">Xiongwen He</span></span></span></span></span></div>
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<span style="font-size: 12pt;"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><br>
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<span style="font-size: 12pt;"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"> China
Academy of Space Technology(CAST)</span></span></span></span></span></span></div>
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