And Digital Channels - Promax 27 Manuel

USER'S MANUAL. PROMAX-27
APPENDIX C.- FREQUENCY
ANALOGUE AND DIGITAL CHANNELS.
It is possible to introduce an offset of the tuning central frequency for the channels
defined in each channel plan using the ∆FCH parameter (± 2.5 MHz). Therefore, it is
possible to adapt the measures to irregular tunings, due to small displacements on
channel central frequencies that are defined by the standard channel plan.
Figure 37.- Frequency offset on the tuning central frequency.
Taking as example the previous figure, if we suppose that in the configuration
parameters of the digital channel (CH-33) a frequency offset equals to 1 MHz has been
defined for the channel tuning frequency (∆FCH = -1MHz), although the central
frequency corresponding to channel 30 (569 MHz) does not match with the defined one
for the current CCIR channel plan (CH-33, 570 MHz), it will be possible to take
measures corresponding to the Docsis normative for the standard FCC channel plan
(CH-30, 569 MHz) with no need to modify the current channel plan or to enter a new
one.
09/2010
OFFSET ADJUSTMENT FOR TUNING
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