[Sls-slp] Fwd: Re: 1-page pink sheet Encapsulation Service

Greg Kazz greg.j.kazz at jpl.nasa.gov
Tue Jun 5 16:47:01 UTC 2007


Attached is a pink Sheet proposal (attached as a PDF file)  to the current 
version of the Encapsulation Service (see 
http://public.ccsds.org/publications/archive/133x1b1c1.pdf for the current 
blue book version).

Paragraph Length of Length Field in the Encapsulation Service in 
the Encapsulation Service is misleading. I believe most users would 
misinterpret the current text on how to fill the remaining bytes of a 
transfer frame by using multiple one-byte fill packets. However, this 
change points out, that from an efficiency point of view, one can simply 
create one larger (than one byte) fill encapsulation packet to fill the 
remainder of the transfer frame.

Please let me know if you have any comments/concerns about this proposal.

best regards,

Greg Kazz

>X-Mailer: QUALCOMM Windows Eudora Version
>Date: Thu, 24 May 2007 12:47:45 -0400
>To: Greg Kazz <greg.j.kazz at jpl.nasa.gov>
>From: Thomas Gannett <tomg at aiaa.org>
>Subject: Re: 1-page pink sheet Encapsulation Service
>Cc: Ed Greenberg <Ed.Greenberg at jpl.nasa.gov>
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>X-Source-Sender: tomg at aiaa.org
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>At 07:05 PM 5/23/2007, Greg Kazz wrote:
>>Can you generate a short 1-page pink sheet, with the following change to 
>> Length of Length Field in the Encapsulation Service
>>The change is: (starts with the 2nd sentence below)
>>>NOTE   -    When the value of the Length of Length field is '00', there 
>>>is no Packet Length field in the Packet Header, therefore the length of 
>>>the Encapsulated Packet is one octet.  One of the services that the 
>>>Encapsulation Packet provides is to supply a fill packet when 
>>>required.  Because of the Encapsulation Service unique ability to supply 
>>>a packet that is but a single byte long this service can  provide a fill 
>>>packet of but a single byte or any size fill packet up to the maximum 
>>>size dictated by the packet length field.
>Thomas Gannett <tomg at aiaa.org>
>+1 443 472 0805
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