EXFO CableSHARK P3 VF/DSL Cable Qualifier - Manual (Page 199)

CableSHARK P3 User Guide
187
11.1..Running a SHDSL Test
Use caution when connecting the test set, as telephone cables may have dangerous A.C. or D.C.
voltages on them.
The SHDSL test transmits a shaped signal onto the circuit under test as described by the ITU-T G.991.2
specification. The received result will be based on the transmitted signal but will also be shaped and
attenuated based on cable characteristics and noise on the line.
Press the RUN / STOP button on the front of the CableSHARK to initiate the SHDSL test. Figure 11.1A
shows an example of the results obtained from a SHDSL Test.
2 250 500 1000 kHz 750
MAIN
MENU
E CHG
TEST
SETUP
Single end SHDSL test complete (for 3995 ft)
SHOW
REF
Frequency
Rx Level
Noise Level
S/N Ratio
301.875 kHz
-54.6 dBm/Hz
-138.19 dBm/Hz
83.6 dB
SHDSL Standard
Data Rate
Noise Margin
ITU-T Annex A
2312 kbits/s
6 dB
-46
-56
-66
-76
-86
-96
-106
-116
-126
-136
-146
-156
dBm/Hz
=
=
=
=
=
=
=
F
SAVE/
UPLOAD ZOOM IN
HORIZ
PROBABLE SPECTRUM - undetermined
-46
-56
-66
-76
-86
-96
-106
-116
-126
-136
-146
-156 dBm/Hz
F IGURE 11.1A – C OMPLETED SHDSL TEST
The SHDSL test result screen shows the Rx Level and the Noise Level of the circuit under test. The
CableSHARK will use these two values to predict the maximum achievable SHDSL Data Rate for this circuit.
At the completion of a test, the function button command selection at the bottom of the SHDSL Test Result
screen consists of several options available to the operator. The following are brief descriptions of each of
the function button options: