ADSL2+ Tester 4 Navigating the Displays
72-0046-03A 43
Fig 20
“
SNR Per Tone
”
results menu
Result
Analysis
Analysis Item
Description
Actual Bit Rates
Displays the actual bit rate. This is the actual bit
rate between the ATU-R and ATU-C when the fast
or interleaved channel is used.
Maximum Bit Rates
Displays the maximum attainable bit rate that the
standards support.
Capacity
Indicates the Capacity. This measurement is an
indication of line capability. It is a ratio of
(achieved line rate/attainable line rate)
×
100. For
example, a CPTY reading of 85% means the
modem has the capability to transmit 15% more
line rate if required.
Attenuation
Total attenuation is the measured difference in dB
between the power by the ATU-R and a reference
ATU-C transmit power level
Downstream:0~63.5dB, Upstream
：
0~31.5dB
Noise Margin
Check to make sure the signal-to-noise margin
complies with your company
’
s requirements. High
values can provide more room for any introduced
noise in the future.
Parameter
Analysis
Output Power
Indicates the transmit power level expressed by
dB.
SNR per Tone
SNR per Tone
Sub-tone
Hlog per Tone
Displays the diagram of transmission character
per tone.
Table 13:
“
Parameter Analysis
”
description
Tone No [
60
]
：
45.94 dB [ESC]
（
d B
）
+ 1
-1
> >
+ 10
