Comtech EF Data IPSat GW1000 - Manual (Page 30)

01-0945-401 Rev. A 08/2004 20
It can be entered in sps (symbols per second).
When changing the symbol rate, the data rate
in the Basic Configuration will also change.
Symbol rate is related to data rate using the
following equation:
Symbol Rate = (Data Rate / (Code Rate x
Modulation Index))
For example, the symbol rate of a 2 Mbps,
Viterbi-DVB 3/4, QPSK transmission is
Symbol Rate = (2000000 / ((3/4) x 2)) =
1333333 sps
[6] DM - Differential Encoding on
modulator: Enables or disables differential
encoding. Used to protect from the possibility
of phase ambiguity errors. Default is on.
[7] SM - Scrambling Type on
modulator: selects type of scrambling
algorithm applied to transmit data stream.
Default is ComStream.
[8] PD - Power Detect: Enables or
disables optional power detector. Default is
disabled.
[9] MFS - Modulator Filter Select:
Selects the spectral shape of the modulated
transmit signal. Used to optimize filter shapes
between modulator and demodulator Default
is ComStream.