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Unformatted text preview: , and to reliably convey
them without detected error from the sending to the receiving ends of the layer.
Efficient telecommand operation can usually be achieved when the Channel Service
(Reference ) rejects less than 1 frame per 103 frames transmitted. To achieve the
performance required for a particular mission, an acceptable combination of Channel Service
parameters (e.g., codeblock decoding method, number of contiguous TC Codeblocks, error
characteristics of the physical layer) must be selected. Information on the frame rejection
performance is given in Reference . CCSDS 202.0-B-2 Page B-6 CCSDS HISTORICAL DOCUMENT November 1992 CCSDS HISTORICAL DOCUMENT
CCSDS RECOMMENDATION FOR TELECOMMAND: DATA ROUTING SERVICE Project operations are compromised by undetected frame errors. The selected Channel
Service parameters not only control the frame rejection rate but also dictate the inherent
undetected frame error rate. If the undetected frame error rate provided by the Channel
Service is inadequate for a project’s needs, the Cyclic Redundancy Check described in sec
126.96.36.199 should be applied to the transfer frame to bring this error rate into conformance.
Information on undetected frame error performance is given in Reference .
B-3.1 Transfer Layer: Sending End Service Specification
From the Segmentation layer above:
(a) TC Frame Data Units. (b) Control instructions, Management Directives and Data Transfer Requests
for the FOP. (See Reference  for details.) From the receiving end of the Transfer layer:
(c) Information concerning the status of receipt of individual TC Frames,
formatted into a Command Link Control Word (CLCW) and extracted from
the Telemetry Transfer Frame (Reference ) or the Virtual Channel Data
Unit (Reference ). From the Coding layer below:
(2) Status of the physical channel. OUTPUTS
To the Segmentation layer above:
(a) Status of the data routing process, including the progress of delivering
individual TC Frame Data Units and the availability of Virtual Channels. To the receiving end of the Transfer layer:
(b) “Control Command” TC...
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This document was uploaded on 03/06/2014.
- Spring '14