D-Link DSL-210 Guia do Utilizador descarregar pdf (Página 48)

DSL-210 USB ADSL Modem User’s Guide

Physical Layer Statistics

The Physical Layer statistics that have not changed since the last poll are not recorded. The following

Physical Layer Statistics are monitored and logged.

•

Upstream Output Power

•

Upstream Noise Margin

•

Upstream Attenuation

•

Upstream Bits per Frame

•

Upstream CRC Errors

•

Upstream FEC Errors

•

Upstream HEC Errors

•

Downstream Output Power

•

Downstream Noise Margin

•

Downstream Attenuation

•

Downstream Bits per Frame

•

Downstream CRC Errors

•

Downstream FEC Errors

•

Downstream HEC Errors

Output Power

is the transmit power level, measured in dBm.

Noise Margin

is the amount of increased noise that can be tolerated while maintaining the designated

BER (bit error rate).

Attenuation

is the difference in dB between the signal power level received and a reference transmitted

signal power level. In other words,

Attenuation

is the decrease in magnitude of a communications signal

between the transmitter and the receiver, measured in dB.

Bits per Frame

is the number of bits in a frame.

CRC Errors

is the number of CRC errors detected.

FEC Errors

is the number of FEC errors detected.

HEC Errors

is the number of HEC errors detected.

Startup Attempts

is the number of times the physical layer has activated.

An example log of the physical layer statistics event is shown in the File Format section below.

1 2 ... 43 44 45 46 47 48 49 50 51

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