8
2.2
Data stream configuration
In the
Basic Settings | Data stream
area the basic settings for the processing of the transport
stream of a channel unit can be configured. The channel filter and PID filter function can be switched on
and off at the corresponding selection boxes.
NIT
The
NIT
text box shows that the NIT (Network Information Table) has been taken over unchanged
(NIT Original).
CAT
There is the option to replace the CAT. The CAT (Conditional Access Table) is generally taken
from the satellite transport stream. In special cases, such as for provider KabelKiosk, it can be
necessary to replace the CAT Operator ID in the transport stream (mark the checkbox
Insert
Operator ID in CAT
). The new value for the CAT Operator ID can be changed manually (field
Operator ID
) and is then inserted into the transport stream in place of the original ID.
Load
In the
Load
text box the current and peak loads of the output are shown in %. The measured
value for peak loading can be reset with the button to the right.
If the loading reaches values of over 90 % the text color changes to red. This indicates that any
further loading through additional channels would exceed the capacity of the output channels
2.3
DVB-C-QAM output-configuration
In the
Basic Settings | Output
area the QAM output of the head-unit can be configured.
HF-output
Using the
HF Output
selection box the HF output of the channel unit can be switched on and off.
Channel
The
Channel
selection box describes a normal cable standard channel grid of K21-K69 and
S21-S41 in steps of 8 MHz.
Frequency
A fine setting of the frequency can be done manually in the text box in steps of 0.25 MHz.
Symbol rate
The fi ne setting of the symbol rates can be done manually in the corresponding text box in steps
of 1 KS/s.
Level
Using the
Level
selection box the signal strength of the output signal can be set in 40 steps
from maximum (0) to minimum (-40).
Constellation
The selection box
Constellation
specifies the QAM constellation (QAM16, QAM32,…QAM256).
Mode
The selection box
Mode
allows the HF output to be modulated with various output signals, for
example, for measuring and analysis purposes:
1.
In the normal operating mode the transmodulated satellite signal is output.
2.
PRBS
:
Test mode. The QAM signal is modulated with the PRBS-23 sequence. Normal
mode is unavailable in this setting.
3.
CW
: Test mode. Sine-wave signal for levelling using simple signal meters. Normal mode is
unavailable in this setting..
