Exfo CableSHARK P3 VF/DSL Cable Qualifier Manual de usuario Pagina 111
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CableSHARK P3 User Guide
99
For SINGLE END tests, the CableSHARK will first determine the length of the cable (up to the first major
impairment which could be the end of the cable), then perform a noise test, attenuation test, and determine
the bits/bin for ADSL upstream and downstream parameters.
Figure 8.3.2A shows an example of the results obtained from a DMT Test Measurement with ANSI FULL
RATE/POTS selected under the ADSL Evaluation option.
0 279 554 1104 kHz829
MAIN
MENU
E
CHG
TEST
SETUP
Single end DMT test complete (for 3971 ft ) CPE
SHOW
REF
Cursor Tone/Freq
Tone Level
Noise Level
S/N Ratio
127 / 547.687 kHz
-53.32 dBm/Hz
-132.28 dBm/Hz
80.4 dB
Number Of Bits
Upstream Rate
Downstream Rate
Noise Margin Up/Down
11
1024 kbps
8192 kbps
6 / 7
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-46
-56
-66
-76
-86
-96
-106
-116
-126
-136
-146
-156
dBm/tone dBm/Hz
=
=
=
=
=
=
=
=
F
SAVE/
UPLOAD
ZOOM IN
HORIZ
EXTRAPOLATED ANSI FULL RATE/POTS RATES
PROBABLE SIGNAL - undetermined
FIGURE 8.3.2A - A DMT TEST RESULT (ANSI FULL RATE/POTS SELECTED)
The ADSL FROM CUSTOMER and ADSL FROM CO/EXCH type DMT Tests display three types of
important information. The first is the Tone Level or Signal Power Spectral Density (PSD) in units of
dBm/tone and dBm/Hz, where dBm/tone is the signal energy within the 4kHz bandwidth of DMT tones. It is
the received signal level measured at the input of an ADSL DMT modem respective of the T1.413 and
G.992.2 standards. This can be located at the top of the DMT graph is typically a smooth line.
The second is the noise level or noise PSD in units of dBm/tone and dBm/Hz, where dBm/tone is the noise
energy within the 4kHz bandwidth. The relation between the two units is x dBm/Hz = (x + 36) dBm/tone. This
graph is normally not smooth; typically comprised of many peaks and valleys.
The third and greatest feature is the lower ‘bit/bin’ or 'bit/tone' graph, which indicates the maximum bits that
can be allocated to an individual DMT tone according to the measured tone level and noise level at that tone
frequency. This graph shows an easy to understand representation of the effects of signal attenuation and
- CableSHARK P3 3
- VF / DSL Cable Qualifier 10
- Patent Information 11
- 1.2 Unpacking the CableSHARK 13
- 1000 ft (300 m) 22
- 4.1.1 The Front Panel 27
- 4.1.2 The Rear Panel 29
- 4.2 Powering the CableSHARK 33
- 5.1.1 Self Tests 37
- 5.2.2 Single-Ended Testing 39
- 5.2.3 End-to-End Testing 40
- 5.3.1 Saving Results 41
- 5.3.2 Recalling Results 43
- 5.4 Reference Masks 45
- 5.6 Bandwidth Requirements 50
- Section 6 Main Menu 51
- 6.2 Responder Mode 58
- 6.3 Recall Results 59
- 6.4 The System Setup Menu 59
- 7.2.1 Automatic TDR Test 65
- 7.2.2 Manual TDR Test 66
- 7.3 Frequency Response Tests 67
- 7.4.2 End-to-End DMT Test 69
- 7.5 Noise Tests 70
- 7.7 Load Coil Detection Test 71
- 7.8 Spectral Detective 72
- 7.10 Return Loss 73
- 7.12 4 Wire Xtalk 73
- 7.14 ADSL Auto Test 74
- 7.15 SHDSL Auto Test 75
- 7.16 VF Auto Test 76
- 7.17 Ground Resistance Test 77
- 7.19 K-Test 78
- 7.20 Ringer Detection 79
- 7.21 VF Tests 79
- 7.22 LoopMapper™ Tests 79
- CableSHARK 81
- FREQUENCY RESPONSE TEST SETUP 84
- 8.2.1 Setting up a TDR Test 89
- 8.2.2 Manual TDR Testing 95
- 8.2.3 Auto TDR Testing 101
- 8.2.4 TDR Application Hints 102
- CableSHARK P3 User Guide 103
- 8.3.1 Setting up a DMT Test 105
- DMT BITS PER 107
- (m/μS): 108
- 8.3.2 Running an ADSL Test 110
- DMT TEST RESULT 114
- 8.4..Noise Measurements 118
- 8.4.2 Running a Noise Test 124
- 00:00:00 125
- TO MEM 130
- TO USB 135
- 8.7.1 Setting up a DMM Test 142
- 8.7.2 Running a DMM Test 148
- 8.8.. 4-Wire Crosstalk Test 151
- 17.3 kHz to 2.208 MHz) 155
- > 100 M 157
- 8.10 LoopMapper™ 159
- 8.10.2 LoopMapper Testing 161
- 8.11.1 Auto Test Setup 168
- IGURE 8.11.1.3C – PHONE BOOK 174
- Central Office 185
- Customer 185
- IGURE 9.2D – ADSL AT CO SIDE 191
- 11.1..Running a SHDSL Test 199
- IGURE 12.1C – BATTERY CROSS 201
- IGURE 12.1.1.3A – RFL CABLE 203
- Black Red Green 204
- Yel low Blue Green 204
- Black Red Gnd 208
- 12.2 Running a RFL Test 210
- 12.3 RFL Hints 212
- + [ 0.0022 * ( T 213
- - 68°F ) * R 213
- - 20°C ) * 0.00393 * R 214
- Line card = not detected 222
- 15.1.3 Sending 3 Tone Slope 233
- 15.2.3 RX 3 Tone Slope 240
- 15.3 Noise Test 243
- 15.4 Impulse Noise Test 245
- 00:09:12 246
- 15.5 Power Influence 247
- SAVE/UPLOAD button 248
- 16.2 Setting up a K-test 249
- 16.3 Running the K-test 250
- 16.3.3 Running a Test 256
- A.1 Loop Topologies 259
- A.2 Attenuation Responses 261
- Transmitter Characteristics 272
- Transmitter Functions 272
- ± 50 ppm 275
- ± 1.0 dB typical 275
- ± 0.5 dB 277
- SHDSL Data Rate Test 278
- PSD Noise Measurement 278
- Longitudinal Balance Test 279
- DMM (Digital Multimeter) 279
- Isolation resistance 280
- Spectral Detective 280
- 4-Wire Crosstalk 280
- Visi-SHARK 282
- Appendix D Safety 283
- Appendix E Warranty 287
- Certification 288
- F.1 Software Policy 289
- F.2 Upgrading Software 289
- J.1 Installing the Software 295
- J.3.1 Running Visi-SHARK 296
- IGURE J.4.2B – SOCKET ERROR 301
- J.6.1 File Menu 305
- J.6.2 Screen Image menu 307
- J.6.3 New Connection Menu 310
- J.6.4 View Menu 311
- J.6.5 Window Menu 311
- Telecom Test and Measurement 321
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