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Unformatted text preview: is figure is not intended to imply any
hardware or software configuration in a real system. Depending on the services actually used
for a real system, not all of the functions may be present in the protocol entity. The
procedures described in this subsection are defined in an abstract sense and are not intended
to imply any particular implementation approach of a protocol entity. CCSDS 132.0-B-1 Page 4-14 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL Packet
Serv ice VC Acces s
Serv ice VC _FS H
Serv ice VC _O C F
MC _FS H
Proces s ing
MC _O C F
Virtual C hannel G eneration
Virtual C hannel Multip lex ing
Mas ter C hannel G eneration
Mas ter C hannel Multip lex ing
All Frames G eneration Figure 4-5: Internal Organization of Protocol Entity (Sending End)
4.2.2 PACKET PROCESSING FUNCTION
220.127.116.11 The Packet Processing Function shall be used to transfer variable-length Packets in
the fixed-length Data Field of Transfer Frames.
NOTE – There is an instance of the Packet Processing Function for each Virtual Channel
that carries Packets.
18.104.22.168 The Data Field of Transfer Frames shall be constructed by concatenating Packets
together until the maximum Data Field length is exceeded. Any Packet that exceeds the
maximum Data Field length shall be split, filling the Data Field completely, and starting a
new Data Field on the same Virtual Channel with the remainder. Construction of the next
Frame Data Field shall continue with the concatenation of Packets until it overflows.
22.214.171.124 If Packets of multiple versions are to be transferred on a Virtual Channel, Packets
of these versions shall be multiplexed into a contiguous string of Packets before constructing
126.96.36.199 The First Header Pointer field shall be set to indicate the location of the first octet
of the first Packet that starts within the Data Field of the Transfer Frame. If no Packet starts
within the Data Field, the F...
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This document was uploaded on 03/06/2014.
- Spring '14