SW Version 2.04 30-January-2009 Page 88 of 128
When the Device Setup is selected both the modulators can be configured from the
dialog that appears.
The QAM symblorate and RF level is applicable to both modulators; while the other
parameters may be configured individually for each internal modulator. Change the
values and press Apply to activate the changes.
The Frequency may only be tuned for the first carrier of the modulator; the remaining
three will automatically be tuned as an offset from the first, with the channel spacing
specified by the user.
Parameter limit-values
Symbol rate 4.48 -> 7.0 MBd
RF Level -23 -> -3 dBm
Constellation QAM16 -> QAM256
Channel spacing 5 -> 8 MHz
The relationship between Symbol rates and bitrates are given by the following
formula. This value is displayed at the bottom of the Device Setup page when values
are entered. The Bandwdth displayed is per transport.
TS rate = 188/204 * symbolrate * bit
Where bit is
Modulation Bit
QAM_16 4
QAM_32 5
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