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Operation instructions | MIE 8-00N | MIE 16-00N | MIE 32-00N | MIE 4-02N | MIE 8-02N | MIE 3-02N | MIE 6-02N
FEC Code rate
Bandwidth
Guard Interval
Transmission Modes
FEC length
L1-Post Constellation
Pilot Pattern
Fine Level
Fine Tune
Note
Page 42 of 70
Thanks to the error correction, errors resulting from high-disturbed transmission routes can be
balanced by restoring data. The data required to restore the signal are included in the transmitted
FEC bits.
Changing the FEC factor modifies the part of the FEC data in relation to the application data (1/2,
3/5, 2/3, 3/4, 4/5, 5/6). A higher part of FEC data means an higher transmission redundancy. But
this reduces the bandwidth for the useful data too.
•
FEC 1/2 - small data rate - strong protection against errors.
•
FEC 5/6 - high data rate - weak protection against errors.
If CCIR is selected as the Norm, the bandwidth of the channels can be changed. With a larger
bandwidth, more data can be transmitted in one channel.
By adjusting the bandwidth, the channels no longer correspond to the channel grid specified by
the Norm.
A guard interval is transmitted between the transmitted symbols of the useful signal. The guard
interval protects against inter-symbol interferences.
A very long guard interval (e.g. 1/4) leads to a very low data rate. A small guard interval is usually
sufficient for transmission in a coaxial distribution network.
The transmission mode can be set between 1k and 8k (ext). 8k (ext) allows the shortest guard
interval in percent and the highest data transmission.
An FEC frame with 64k FEC length or a (short) one with 16k FEC length can be configured.
The L1 post signalling contains parameters that provide information to the receiver. Constellation
types BPSK, QPSK, QAM16 and QAM64 can be configured for L1 post signalling.
L1 pre-signalling is always BPSK modulated.
Depending on the Guard Interval and the transmission mode, Pilot Pattern PP1 to PP8 can be
selected.
The level fine adjustment attenuates the output level of each individual modulator output
separately from 0 to -3 dB.
In addition, each modulator output can be disabled (Off option).
The fine tuning of the output channel is performed in 0.5 MHz steps.
Some configuration options are dependent on each other. In this case,
selectable values are highlighted in white, non-selectable values in
grey.
BA_MIE-N.pdf | Technical improvements, changes in design, printing- and other errors reserved. | 2023-06-15
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