<font size=3 face="Calibri">Dear Erik,</font>
<br><font size=3 face="Calibri">Attached is the draft FF-CSTS Red Book,
ready for submission to the Secretariat. It contains the following updates:</font>
<br><font size=3 face="Calibri">a. Final coordination
tweaks for alignment with the draft SFW Pink Book;</font>
<br><font size=3 face="Calibri">b. Responses to the
three outstanding comments from your review of the previous version of
that document (more on that in a moment); and</font>
<br><font size=3 face="Calibri">c. A reworking the
Forward AOS sections of annex I to incorporate Ken Andrews’ comments.
</font>
<br><font size=3 face="Calibri"> </font>
<br><font size=3 face="Calibri">Regarding the three outstanding comments
from your review:</font>
<br><font size=3 face="Calibri">a. The last sentence
in the Note under section 3.1 addresses the FF variance from the Guidelines
with respect to having two modes for the prime procedure type. You asked
if it was consistent with the Guidelines. The WG had decided that rather
than explicitly address the topic of multiple prime procedures, the approach
would be to state that the Guidelines could be deviated from if such deviation
is necessary to make a service work. All that the deviating service specification
would need to do is point out the nature of the deviation. Wolfgang has
confirmed that section 1.1 of the May 2018 draft of the Guidelines states
<br>
<br>
“Any CSTS specification should follow this Recommended Practice to the
greatest extent possible and practical, but if a service has circumstances
that are not addressed by this document, that service specification can
go beyond these guidelines as long as those extensions are explicitly identified
in the service specification.” <br>
<br>
Section 3.1 of the FF-CSTS specification contains a NOTE that states<br>
<br>
“Normally, CSTSes do not have modes that require different prime procedure
types. However, because each Forward Frame service instance must support
one of several space data link protocols, some of which require capabilities
provided by the Sequence-Controlled Frame Data Processing (SCFDP) procedure
and some that require the Buffered Frame Data Processing (BFDP) procedure,
the Forward Frame service must allow the SCFDP procedure to be prime in
some service instantiations and the BFDP procedure to be prime in other
service instantiations. The approach adopted in this specification is to
define two modes, each with its own prime procedure. This approach is not
documented in the Guidelines (reference [3]) and is used in this service
only because the requirements are outside the provisions of the Guidelines.
Note that section 1.1 of the Guidelines permits such variances as long
as they are necessary to the service and are identified in the service
specification as being a variance from the Guidelines.”<br>
<br>
Thus the FF book is consistent with the Guidelines on this point, and the
WG believes this item to be closed.<br>
</font>
<br><font size=3 face="Calibri">b. You (commented
that the title of table A-5 is “Required Procedures”, but some of the
procedures are optional. The title of the table has been changed to “Procedures
Used by the FF-CSTS Specification”. <br>
</font>
<br><font size=3 face="Calibri">c. You suggested putting
“ASN.1” in the title of the annexes that specify ASN.1 modules. The annexes
in question have two parts: the first one has an ASN.1 specification of
the module, and the second part specifies that the transfer syntax be the
Basic Encoding Rules (BER). We have added “ASN.1” to the titles of the
subsections that contain the ASN.1 specifications, e.g., “Forward Frame
Object Identifiers ASN.1 Module”. </font>
<br><font size=3 face="Calibri"> </font>
<br><font size=3 face="Calibri">John will follow up with Ken by providing
a copy of the updated material related to the Forward AOS Sync and Channel
Coding functions. However, we do not believe that we should continue to
iterate on this material prior to submission for Red-1 review. </font>
<br><font size=3 face="Calibri"> </font>
<br><font size=3 face="Calibri">The Working Group requests that you begin
the process of submitting this document to the Secretariat for Agency Red
Book review. We will be holding a WG splinter meeting this coming Thursday
to discuss the prospects for having the SFW Pink Book ready for its review,
and we’ll inform you of our findings. But we believe that whatever the
outcome there, Tom G should get started on the FF book as soon as possible.
</font>
<br><font size=3 face="Calibri"> </font>
<br><font size=3 face="Calibri">Best regards,</font>
<br><font size=3 face="Calibri">Holger, on behalf of John, Wolfgang, Tim
and the CSTS WG</font>
<br><font size=3 face="Calibri"> </font>
<br>
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