The precise specifications for use of the report

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ved value of the FARM’s NEXT EXPECTED FRAME SEQUENCE NUMBER V(R). The FARM V(R) counter shall increment once each time a Type-AD TC Frame is accepted on a particular Virtual Channel. The precise specifications for use of the REPORT VALUE are contained in Reference [7]. Necessarily, separate counters shall be maintained for each Virtual Channel. 4.3 STANDARD PROCEDURES WITHIN THE LAYER Standard procedures within the Transfer layer are concerned with the following operations: (1) (2) At the receiving end of the system, performing standard “Frame Validation Checks” on all TC Frames reconstituted from the Coding layer. (3) 4.3.1 At the receiving end of the system, reconstituting TC Frames from the data stream provided by the Channel Service Coding layer and removing any Fill Data transferred from that layer. At both ends of the system, executing the Command Operation Procedure which is used to move TC Frames across the Transfer layer, including performing frame acceptance checks and establishing and using various counters, numbers and windows. FRAME DELIMITING AND FILL REMOVAL PROCEDURE The Telecommand Channel Service (Reference [4]) resides immediately below the Transfer layer. At the sending end of the TC System, the Transfer layer passes one or more TC Frames to the Channel Service Coding layer, which encodes the frames to protect them from errors which may be introduced as they are transmitted through the physical channel. Fill Data may have to be inserted by the Channel Service to ensure correct transmission of all valid data. The receiving end of the Transfer layer receives as an input from the Coding layer a series of data octets, corresponding to the decoded frame(s), which have been declared “clean” by the Coding layer insofar as they contain no detected errors. The Coding layer provides a “Data Start” signal to the Transfer layer, indicating that data are being transferred. The Data Start signal shall be set TRUE while the Coding layer is in the process of actively tr...
View Full Document

This document was uploaded on 03/06/2014.

Ask a homework question - tutors are online