Exfo VDSL2 Manual de usuario descargar pdf (Pagina 87)

Data Analysis

VDSL2, ADSL2+, and IP Triple-Play Test Set 81

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.

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Exfo VDSL2 Manual de usuario Pagina 87