CableSHARK
P3
User Guide
11
Not all cables are the same, hence the variations in VOP. Conversely, not all local loops are the same.
Some local loops are longer than others and susceptibility to noisy environments varies. All signals on these
loops, regardless of cable length or environment, are subject to attenuation. Attenuation affects both
transmitted and reflected signals and, if the signal-to-noise ratio is low enough, impairments may not be
identifiable. To overcome the affects of attenuation, use a larger pulse width (more energy) to locate
impairments or take measure from both ends of the cable.
The following diagrams depict possible TDR traces and their causes.
Cursor position =
Marker position =
Cursor / Marker Delta =
0.0
1250.0
2500.0
5000.0
3750.0
ZOOM IN
VERT
MAIN
MENU
E
F
CHG
-1.000
-0.750
-0.500
-0.250
0.000
0.250
0.500
0.750
1.000
1998.7
0
1998.7
Pulse Width:
ft
ft
300 ns
ZOOM IN
HORIZ
SELECT
MARKER
MORE
AUTO
REPEAT
Reflections at ft(dBRL): 1998.7 (33.8+)
Cursor position =
Press or to move cursor
The above figure depicts an OPEN circuit or a
high impedance fault. Depending upon the size of
the reflected pulse, the OPEN could be an partial
(small pulse) or complete (large pulse) open
circuit. Of course, the length of the cable,
attenuation on the line, and the size of the
outgoing pulse will play a big role in determining
the reflection.
0.0
1250.0
2500.0
5000.0
3750.0
ZOOM IN
VERT
MAIN
MENU
E
F
CHG
-1.000
-0.750
-0.500
-0.250
0.000
0.250
0.500
0.750
1.000
ZOOM IN
HORIZ
SELECT
MARKER
MORE
Reflections at ft(dBRL): 1998.7 (33.8+)
AUTO
REPEAT
Cursor position =
Marker position =
Cursor / Marker Delta =
1998.7
0
1998.7
Pulse Width:
ft
ft
300 ns
Cursor position =
Press or to move cursor
The above figure depicts a SHORT circuit or a
low impedance fault. Depending upon the size of
the reflected pulse, the SHORT could be an
partial (small pulse) or complete (large pulse)
short circuit. Of course, the length of the cable,
attenuation on the line, and the size of the
outgoing pulse will play a big role in determining
the reflection.
Summary of Contents for CableSHARK P3
Page 1: ......
Page 10: ...VF DSL Cable Qualifier viii...
Page 12: ...VF DSL Cable Qualifier x...
Page 26: ...VF DSL Cable Qualifier 14...
Page 36: ...VF DSL Cable Qualifier 24...
Page 64: ...VF DSL Cable Qualifier 52...
Page 80: ...VF DSL Cable Qualifier 68...
Page 184: ...VF DSL Cable Qualifier 172...
Page 192: ...VF DSL Cable Qualifier 180...
Page 224: ...VF DSL Cable Qualifier 212...
Page 228: ...VF DSL Cable Qualifier 216...
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...
Page 268: ...VF DSL Cable Qualifier 256...
Page 286: ...VF DSL Cable Qualifier 274...
Page 292: ...VF DSL Cable Qualifier 280...
Page 294: ...VF DSL Cable Qualifier 282...
Page 316: ...VF DSL Cable Qualifier 304...
Page 318: ...VF DSL Cable Qualifier 306...
Page 319: ...CableSHARK P3 User Guide 307 Notes...
Page 320: ...VF DSL Cable Qualifier 308...