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CGT 660
5
p
rogramming
5.1 p
repar ation
•
Connect the test receiver to the modulator output on the COFDM-QAM module
G
(page 11) or to the HF output on the output collector if it is already connected.
• Adjust the test receiver to the output channel of the channel strip to be set.
•
Switch on the channel strip (modulator) if necessary (page 19). For each
channel strip, there is an LED which indicates if the channel strip is switched
on.
Status LED
Channel strip ”A”
Status LED
Channel strip ”B”
5.2 n
otes
on
level
set ting
– In order to prevent interference within the head-end station and the cable
system, the output level of the COFDM-QAM module must be lowered by
10 dB compared to the system level at 64 QAM, and by 4 dB compared to
the system level at 256 QAM.
– Check the output level of the output collector according to the assembly
instructions of the head-end station CSE 2800 and if necessary set it to the
demand of the cable system.
