User`s manual

NVF-800S 4-Band VDSL IP DSLAM USER’S MANUAL Ver_B.2
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If your line is particularly susceptible to bursts of noise then interleaving should improve your vdsl experience simply
because if you lose a whole batch of data then this could cause your bridge to loose sync with the exchange.
Using Interleaving, the bridge is able to re-assemble the data or if necessary just re-request the part of the data that it is
unable to recover. By increasing the interleave depth of each ports that are susceptible to noise, this will improve error
performance and stability of marginal lines.
Interleave Depth is defines as the number of bits (or bytes) in each block of data.
VDSL supports a various levels of interleaving, the depth of which can range from 0 (no interleaving) to 64.
Interleave Delay applies only to the interleave channel and defines the mapping (relative spacing) between subsequent
input bytes at the interleaver input and their placement in the bit stream at the interleaver output. Larger numbers provide
greater separation between consecutive input bytes in the output bit stream allowing for improved impulse noise immunity
at the expense of payload latency.
Maximum Interleave Delay is the configurable attribute on some DSLAMs/bridges as the maximum time for the
Interleave Delay. The higher the Interleave Delay the greater the Interleaving Depth.
In this field, enter the value for the
Downstream/Upstream Parameter, Configured maximum Interleave Delay, for this channel.
Note:
Interleaving Depth & Interleaving Delay do not appear to be the same thing as the additional amount of latency you will
see when interleaving is switched on nor is latency affected by speed (e.g. it does not decrease when one go from 1Mbits
to 5Mbits).