Exfo FTB-635 Wideband Copper and DSL Test Module Instrukcja Użytkownika Pobierz pdf (Strona 330)

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xDSL Test Results

322 FTB-635

DSL Information

 Downstream and Upstream parameters:

 Line Attenuation (dB) is line attenuation measured during the

training phase.

Note: DSL Info displays attenuation for ADSL1/2/2+ only. See Band Information

for VDSL2 attenuation.

 Signal Attenuation (dB) is a value ranging from 0 through 63.5 for

the maximum attenuation.

 300 kHz Attenuation displays the line attenuation value in dB

measures at 300 kHz.

 Output Power (dBm) is the current transmit power level that is a

measure of the aggregated transmit power.

 Latency is the path type, Fast or Interleave, set by the service

provider at the CO. The use of the interleaved path means greater

delay in the delivery of data but it is less susceptible to noise or

crosstalk due to increased Reed-Solomon coding and FEC

(forward error checking). The use of the fast path means little or

no delay in the delivery of data but it is more susceptible to noise

and crosstalk.

 INP is the level of impulse noise protection.

 G.INP is the standards based Physical Layer Retransmission

scheme for impulse noise protection and will report Active or

Not Active. G.INP state will be shown unless system is using Phy-R.

 Phy -R is Broadcom proprietary Physical Layer Retransmission

technology which is used to overcome impulse noise.

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