Data accumulation rate

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Revision as of 16:35, 9 October 2012 by Dvw (talk | contribs)

This page gives some rules for estimating the data accumulation rate for a running MCE.

In general, during a regular acquisition, the data rate of a MCE is:

<math>S_w \times N_c \times N_r \times R</math>

where:

  • <math>S_w</math> is the word size (=32 bits)
  • <math>N_c</math> is the number of columns read (<math>=8 \times N_{RC}</math>, where <math>N_{RC}</math> is the number of readout cards used)
  • <math>N_r</math> is the number of rows read
  • <math>R</math> is the read-out data rate

A useful approximation is:

a single readout card reading 41 rows at 400 Hz is <math>\approx0.5</math> megabytes/second.

Here's are some tables of accumulation rates for a two readout card 48HP subrack (multiply by 2 for a full sized 72HP subrack with 4 readout cards) for various data rates and numbers of rows:

48HP subrack data accumulation rate in Gigabytes (<math>10^9</math> bytes) per hour
150 Hz 200 Hz 300 Hz 400 Hz
25 rows 0.8 1.1 1.6 2.1
33 rows 1.1 1.4 2.1 2.8
41 rows 1.3 1.8 2.6 3.5


48HP subrack data accumulation rate in Gigabytes (<math>10^9</math> bytes) per day
150 Hz 200 Hz 300 Hz 400 Hz
25 rows 19.3 25.7 38.6 51.5
33 rows 25.5 34.0 51.0 68.0
41 rows 31.7 42.2 63.3 84.5