VF / DSL Cable Qualifier
102
Press the RUN / STOP button on the front of the CableSHARK to initiate the test.
Figure 8.3.3A shows an example of the results obtained from an ADSL2+ Test
0
555
1106
2200 kHz
1657
MAIN
MENU
E
CHG
DMT TEST RESULT
TEST
SETU P
Single end D MT test complete.
SHOW
REF
Cursor Tone/Freq
Tone Level
Noise Level
S/N R atio
127 / 547.687 kH z
-5 3.32 dBm/H z
-1 32.28 dBm/ Hz
80.4 dB
Num ber Of Bits
Upstream Ra te
Dow nstream Rate
Noise Margin Up/D own
11
1024 kbps
2302 4 kb ps
6 / 7
-1 0
-2 0
-3 0
-4 0
-5 0
-6 0
-7 0
-8 0
-9 0
-1 00
-110
-1 20
-4 6
-5 6
-6 6
-7 6
-8 6
-9 6
-1 06
-116
-1 26
-1 36
-1 46
-1 56
dBm/to ne
dBm/H z
=
=
=
=
=
=
=
=
F
SAVE/
UPLOAD
ZOOM IN
HORI Z
EXTR APOL ATED ADSL2+ ITU Ann ex A/POTS R ATES
PROBABLE SIGNAL - AD SL U p
F
IGURE
8.3.3A
–
ADSL2+
D
ATA
R
ATE
P
REDICTION
T
EST
The ADSL2 / ADSL2+ Data Rate Prediction test looks at the attenuation of the ATU PSD Mask rather than
the simple frequency response of the original DMT test. This process provides a more accurate estimation of
the data rate expected by the customer.
Here are the PSD masks for ATU-R (CPE) and ATU-C (CO). The transmit level of the signal will depend
upon the length of the circuit under test. For short lengths, a low transmit level will be used to prevent
unnecessary crosstalk in adjacent pairs. For long lengths, a higher transmit level will be used to allow the
signal to reach the far end.
Summary of Contents for CableSHARK P3
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Page 262: ...VF DSL Cable Qualifier 250 CSA Loop 6 CSA Loop 7 CSA Loop 8 Extended CSA Loop 9...
Page 263: ...CableSHARK P3 User Guide 251 Extended CSA Loop 10 Mid CSA Loop 0 Mid CSA Loop 1 Mid CSA Loop 2...
Page 264: ...VF DSL Cable Qualifier 252 Mid CSA Loop 3 Mid CSA Loop 4 Mid CSA Loop 5 Mid CSA Loop 6...
Page 265: ...CableSHARK P3 User Guide 253 ANSI Loop 2 ANSI Loop 3 ANSI Loop 4 ANSI Loop 5...
Page 266: ...VF DSL Cable Qualifier 254 ANSI Loop 6 ANSI Loop 7 ANSI Loop 8 ANSI Loop 9...
Page 267: ...CableSHARK P3 User Guide 255 ANSI Loop 11 ANSI Loop 12 ANSI Loop 13 ANSI Loop 15...
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