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Unformatted text preview: Physical
188.8.131.52 If the Frame Error Control Field is present, check bits shall be generated using the
encoding procedure described in 184.108.40.206 and inserted into the Transfer Frame Trailer.
NOTE – If this field is present, it must be present in all the Transfer Frames transmitted in
a particular Physical Channel.
220.127.116.11 An abstract model of the All Frames Generation Function is illustrated in figure 4-11. CCSDS 132.0-B-1 Page 4-20 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL MC Multiplexing
All Frames All Frames
Channel Error Control Encoding All Frames
Coding Sublayer Figure 4-11: Abstract Model of All Frames Generation Function
4.3 PROTOCOL PROCEDURES AT THE RECEIVING END 4.3.1 OVERVIEW
This subsection describes procedures at the receiving end associated with each of the
functions shown in figure 4-12. Data flow from the bottom to top of the figure. This figure
identifies data-handling functions performed by the protocol entity at the receiving end, and
shows logical relationships among these functions. This 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 4-21 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
MC _O C F
Virtual C hannel Recep tion
Virtual C hannel Demultip lex ing
Mas ter C hannel Recep tion
Mas ter C hannel Demultip lex ing
All Frames Recep tion Figure 4-12: Internal Organization of Protocol Entity (Receiving End)
4.3.2 PACKET EXTRACTION FUNCTION
18.104.22.168 The Packet Extraction Function shall be used to extract variable-length Packets
from the fixed-length Data Field of Transfer Frames.
NOTE – There is an instance of the Packet Extraction Function for each Virtu...
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This document was uploaded on 03/06/2014.
- Spring '14