Data Analysis
Copper, VDSL2, ADSL2+, and IP Triple-Play Test Set
209
Reading Results
DSL Parameters
The
DSL Params
tab allows you to view the pass/fail status of the
DownStream
and
UpStream
parameters configured in the test setup.
The available test results are the
following:
³
SNR Margin
is a value ranging
from 0 through 63.5 for the
minimum signal-to-noise ratio
margin.
³
Attenuation
is a value ranging
from 0 through 63.5 for the
maximum attenuation.
³
Output Power
is the current transmit power level that is a measure of
the absolute transmit power.
³
INP
is the level of impulse noise protection.
³
Interl.Depth
is interleave depth which defines the number of bits (or
bytes) in each block of data.
³
Interl.Delay
is interleave delay which defines the mapping (relative
spacing) between subsequent input bytes at the interleave input and
their placement in the bit stream at the interleave output.
³
Trellis
or Trellis Coded Modulation (TCM) is a type of convolutional
code which utilizes parity bits on each symbol within a continuous
data stream. When the line is connected, Trellis displays either
ON
or
OFF
.
³
BITSwap
specifies the status of the bit swapping mechanism -
Active
,
Not Active
or
Unknown
- swapping bits from tone
m
to tone
n
to
prevent modem retraining.
