Operation instructions | SKT 40-00 | SKT 80-00 | 8PSK/QPSK | COFDM Quattro/Octo Module
18
2016-01-11 | © AXING AG Switzerland | Subject to change in design and type; errors and misprints reserved
CROSS MULTIPLEX MODE:
If the network ID is changed to a value greater than zero, the CROSS MULTIPLEX MODE is activated.
In this mode, the tuners are no longer assigned to
the modulators. The programs can be freely assigned to the
modulators.
Combining programs from several transponders in a common output channel allows program packages to be
created and thus saves transmission capacities in the distribution networks.
ATTENTION: The set network ID can be allocated only once in the head station. Several network IDs must be
consecutive.
The performed modifications are only taken over by the system when you click the button
SAVE MODIFICATIONS
.
After the network ID has been changed, the IDs of the transport streams are automatically incremented by one
to four.
Manual setting of the network ID is mostly intended for use with CAM modules. CAM modules only have a
limited number of available PIDs that must not be exceeded.
Information:
Cross Multiplex can only be used with FTA programs! Please note that in the CROSS MULTIPLEX
MODE, programs with the same video/audio PIDs from two or more transponders cannot be grouped in one
modulator.
After the programs have been activated, check the fill level. The data rate of the sender on the DVB-S/S2
transponders may vary depending on the image contents and on the transmission quality. To ensure an
undisturbed reception, a reserve must absolutely be observed. We recommend you to set the maximal fill level
to 90%. If the current fill level exceeds the maximal fill level, it may cause image disturbances, e.g. mosaic
images.
The data rate of the DVB-T channel depends furthermore on the chosen channel bandwidth (7 or 8 MHz), on
the set error correction rate (FEC) and the modulation rate (QPSK, QAM16, QAM64) of the modulator.
If the displayed data rate exceeds 90%, there are different possibilities
to change it:
x
Change to a channel with a bandwidth of 8 MHz if a 7 MHz channel was selected previously.
x
Raise the modulation rate to 64 QAM. QPSK corresponds to the lowest, the QAM64 setting to the highest
output data rate.
x
Set the forward error correction to 7/8. With this setting, the data rate is increased, but the error
correction is lower. A lower error correction requires a better transmission quality from the antenna
network.
x
Set the guard interval to 1/32. This shorter guard interval allow
s
you to reach greater data rates.
x
Reduce the number of selected programs in the channel list.
