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Quantum and Evolution Series Installation and Operating Handbook
Figures: Overhead rate with backward alarm (/ Overhead rate without backward alarm, if
different)
ESC rates 9.6kbps
2400
33.3%
Baud
4800
100%
Baud
9600
n/a
Baud
19200
n/a
Baud
38400
n/a
Baud
The formula for deriving the overhead rate is moderately complex, and relies on many
different parameters. For other mixes of data rate and async settings the simplest way to
determine the overhead is to enter the parameters into a modem and then select
View/Config/Tx-Rx. This screen shows the exact overhead percentage. Information on the
framed data rate, the data rate including any Reed-Solomon encoding and the final symbol
rate including the effects of the `inner ` FEC and modulation can be found under
View/Monitor/Tx-Rx.
Main data channel rates
16kbps
64kbps
20%
5% / 4.8%
50%
10%
100%
20%
n/a
50%
n/a
100%
8-28
256kbps 512kbps 1024kbps 2048kbps
1.25% /
0.62% /
1.19%
0.59%
2.5% /
1.25% /
2.38%
1.19%
5% /
2.5% /
4/76%
2.38%
10%
5% /
4.76%
20%
10%
0.39% *
0.39% *
0.62% /
0.39% *
0.59%
1.25% /
0.62% /
1.19%
0.59%
2.5% /
1.25% /
2.38%
1.19%
5% /
2.5% /
4.76%
2.38%
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