CCSDS File Delivery Protocol (CFDP)—Part 1: Introduction and ...

CCSDS REPORT CONCERNING THE CCSDS FILE DELIVERY PROTOCOL (CFDP)
– create directory;
– remove directory;
– deny directory;
– list directory.
In some circumstances, it is advantageous for the CFDP protocol to be able to recognize
record boundaries within the file. If this option is to be used, the filestore must have the
capability to make the distinction between such files and those that are to be treated as a
stream of octets.
2.4.5 MANAGEMENT INFORMATION BASE
To perform a file delivery, a significant amount of information must be passed by the local
user to its local CFDP entity, and by the local CFDP entity to the remote CFDP entity.
Typically, this data is static and is maintained by the CFDP entities as system tables, referred
to as the Management Information Base (MIB). The MIB contains such information as
default values for user communications requirements, e.g., for address mapping, and for
communication timer settings. The MIB is formally defined as part of the protocol
specification.
2.4.6 UNDERLYING COMMUNICATION SYSTEM
The protocol assumes the availability of an underlying communication system to which all
CFDP entities in a given CFDP addressing domain have access. In order that the protocol
may operate over a wide range of implementations including CCSDS, Internet and Open
Systems Interconnection (OSI) networks, the services required by the protocol have
intentionally been kept as simple as possible. This underlying conceptual communication
system is referred to as the Unitdata Transfer (UT) layer. Since only minimal network
capabilities are assumed, services sometimes provided by the UT layer (such as transaction
multiplexing, sequence auditing, and error detection) are provided by CFDP.
It should be noted that although the CFDP protocol can operate over a service where data
errors, data loss, and out-of-sequence delivery occur, it is not intended to compensate for
networks where these effects are prevalent. Severe performance reductions will result if such
an approach is taken.
CCSDS 720.1-G-3 Page 2-10 April 2007