Data accumulation rate
From MCEWiki
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:
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 |
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 |