Fundamental Technologies/
University of Kansas

Voyager LECP Pages

Figure 7.3-3. LECP EDR Science Data Block Organization (CR-4)

Logical records are written into physical record data blocks according to the following algorithm:

Let K.1, K.2, K.3 denote segments 1, 2, and 3 of logical record K.
Let N = (SCT60 Modulo 12)/4 + 1, rounded down.
For SCT60 0-11, N = 1, 2, and 3.

Physical Record
N(1)

Physical Record
N(2)

Physical Record
N(3)
MF K.SEG MF K.SEG MF K.SEG
1 1.1 41 14.2 81 27.3
2 1.2 42 14.3 82 28.1
3 1.3 43 15.1 83 28.2
: : : : : :
38 13.2 78 26.3 118 40.1
39 13.3 79 27.1 119 40.2
40 14.1 80 27.2 120 40.3

Logical Record 1 appears at the beginning of a data block once every three physical records (120 MF; 9.6 min) when SCT60 Modulo 12 = 0. A segment number of (SCT60 Modulo 12)/4 + 1 rounded down will be inserted into the EDR header of each physical record to indicate which of the above three data block patterns appear in a given phpysical record.

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Last modified 12/3/02, Tizby Hunt-Ward
tizby@ftecs.com