Unformatted text preview: 1 Page 2-14 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 3
3.1 SERVICE DEFINITION
OVERVIEW This section provides service definition in the form of primitives, which present an abstract
model of the logical exchange of data and control information between the protocol entity
and the service user.
The definitions of primitives are independent of specific
The parameters of the primitives are specified in an abstract sense and specify the
information to be made available to the user of the primitives. The way in which a specific
implementation makes this information available is not constrained by this specification. In
addition to the parameters specified in this section, an implementation may provide other
parameters to the service user (e.g., parameters for controlling the service, monitoring
performance, facilitating diagnosis, and so on).
3.2 SOURCE DATA 3.2.1 SOURCE DATA OVERVIEW
NOTE – This subsection describes the service data units that are transferred from sending
users to receiving users by the TM Space Data Link Protocol.
The service data units transferred by the TM Space Data Link Protocol are as follows:
b) Virtual Channel Access Service Data Unit (VCA_SDU);
c) Frame Secondary Header Service Data Unit (FSH_SDU);
d) Operational Control Field Service Data Unit (OCF_SDU);
e) TM Transfer Frame.
22.214.171.124 Packets shall be transferred over a space link via the Packet Service. 126.96.36.199 The Packets transferred by this service must have a Packet Version Number (PVN)
authorized by CCSDS. Further, each Packet transferred must conform to the corresponding
packet format specified by reference .
188.8.131.52 The position and length of the Packet Length Field of the Packets must be known to
the service provider in order to extract Packets from Transfer Frames at the receiving end. CCSDS 132.0-B-1 Page 3-1 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL NOTES
1 Packets are variable-length, delimited, octet-aligned data units, and are usually the
protocol data unit of a Network Layer protocol. 2 For the PVNs presently aut...
View Full Document
This document was uploaded on 03/06/2014.
- Spring '14