Operating Manual 6175.4760.02 – 01 4.131
M3SR Series 4100 Changing the Rx and Tx Interleaver Length
4.5.3.2 Changing the Rx and Tx Interleaver Length
Softkey Selection / Editor Description
Listbox
In the central area the currently active value is
displayed.
1. Press 'Tx INTL' softkey.
2. Select desired interleaver length from list-
box.
3. Press 'ENT' to confirm.
Possible values:
• ultrashort
• very short
• short
• medium
•long
• very long
The interleaver rearranges the user data
blocks to allow the FEC correcting adjacent bit
errors due to short drop-outs caused by fast
fading or static discharges.
The extent of rearrangement is defined by the
interleaver length (from ultra short to very
long).
Longer interleaving usually performs better
due to the possibility to handle longer distur-
bances, although at the price of higher latency
in the data transmission.
For waveforms with autobaud capability like
STANAG 4539 the HF Modem is able to de-
tect the appropriate Rx interleaver length auto-
matically with the presence of a signal.
Therefore an adjustment of the Rx interleaver
length is not possible for autobaud waveforms.
For waveforms without autobaud capability
like STANAG 4285 the interleaver length cho-
sen for the transmitter needs to match the ad-
justed interleaver length at the receiver on the
other end of the link.
The use of interleaver length ZERO (no in-
terleaving) is not advisable.
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