BSi IRX-3811, Руководство по эксплуатации продукта

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Setting Description
Symbols
Lower order modulation formats like QPSK do not transmit data as fast as
the higher modulation formats such as 64-QAM, but they can be received
when signal strengths are lower.
Code Rate
Match the code rate to the requirements of the broadcast network. The
higher the level of error correction that is applied, the greater the level of
supporting error correction data that needs to be transmitted, which
reduces the data rate of the transmission. For example, if you select 2/3,
for every 2 bits of data, you are sending out 3 bits, one of which is for
error correction.
Guard Interval
Choose the appropriate guard interval so that distinct transmissions do
not interfere with each other. 1/4 results in the best protection but the
lowest data rate; 1/128 provides the lowest protection and the highest
data rate.
Camera Video Format Specifies the camera video format. Select the mode and frame rate to
match the camera and production workflow.
Note that if you set the video format to
‘Auto’, the image may be in the
wrong format for the production.
Fiber remote and splitter settings
If the system includes fiber remote and active UHF splitter components, there are some settings that you
may need to change.
From the main menu, select Fiber and configure as follows.
Table 11: Fiber remote and splitter settings
Setting Description
Fiber Remote Attenuation
Select the check boxes to enable RF attenuation in the fiber remote unit (if
this is connected in the system). You may need to do this if RF system
experiences an ‘overloading’ condition. This can occur if the transmitter
RF power level is too high, and the transmitter is too close to the
downconverters or if you have some external interference.
Use the Connection Map to check what is connected in the system and
select the appropriate check boxes.
Downconverter Power Status
Re-enables power if a short circuit is detected on the connections
between the remote fiber unit and downconverters.
Splitter Active Mode (Gain Boost)
Adds a gain boost into the splitter system when RF levels are too low. Use
the Connection Map to check whether the system includes an active UHF
splitter.
The numbers refer to which connections are made on the rear panel RF
connectors. When selected, you get a gain boost, although the default
setting is for these
not to be selected.
If selected when RF levels are not too low can cause the system to
overload/saturate.