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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When trying to describe the use of CFDP over BP, I have stumbled across a peculiarity of the BP service interface: the Application Data Unit Parameter is defined as
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">4.3.9 APPLICATION DATA UNIT PARAMETER<o:p></o:p></p>
<p class="MsoNormal">The application data unit parameter shall indicate <b>the location (in memory or non-volatile storage, a local implementation matter)</b> of the application data conveyed by the bundle.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For me this seems to be to implementation-specific for an abstract service interface and would prefer if we could say that the application data unit parameter simply *<b>is</b>* the application data unit as defined in 1.4.3.2:<o:p></o:p></p>
<p class="MsoNormal">application data unit, ADU: The application-specific data being transferred via the Bundle Protocol.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Of course, for a lot of implementations it will be practical to pass a pointer to the application data and not a copy. So, we could add a note that the way application data is actually passed is implementation specific. No other CCSDS service
interface seems to work with ‘locations’ of data.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If we want to keep the application data unit parameter as location, I think we should at least update the Send.Request and the BundleDelivery.Indication to include ‘application data unit parameter’ instead of ‘application data unit’.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-ligatures:none;mso-fareast-language:EN-GB">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-ligatures:none;mso-fareast-language:EN-GB">Felix<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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