Appendix A Test Results
Cable Status results
HST-3000 Ethernet Testing User’s Guide
265
Polarity result
The Polarity result indicates the polarity of each MDI pair on
active 1G electrical links, indicating how each pair is physi-
cally wired to the unit’s port.
–
Normal (+)
indicates a normal polarity for the pair.
–
Inverted (-)
indicates an inverted polarity for the pair.
Pair Skew
result
The Pair Skew result is a measurement of timing differences
between the MDI pairs on active 1G electrical links. Timing
differences may occur for a variety of reasons. For example,
if different insulating materials are used on the pairs, a vari-
ance in the signal velocity (skew) may occur. If the skew is
significant, transmission of the signal may be impaired to such
a degree that the received signal can not be synchronized.
Pair skew is reported in +/- 8ns increments.
Fault results
If a link is inactive, and a fault is detected, the unit indicates
the type of fault detected (
Open
,
Short
, or
Unknown
) and the
fault’s relative distance from the tester /- 1 meter.
If you do not connect the cable to a far end device (completing
the circuit), you can also use the Open detection feature to
measure the length of a cable.
Fault types are defined as follows:
Open—Indicates there is a cut on the pair (or that the cable is
not connected to a device at the far end of the circuit), and that
the tester has detected an impedance exceeding 333 ohms.
The distance from the near end tester to the end of the cable
(or the cut) is also provided.
Short—Indicates a positive and negative line on the same
pair are touching, and that the tester has detected an imped-
ance less than 33 ohms.
Summary of Contents for IP Video Test Option HST-3000
Page 1: ...HST 3000 Ethernet Testing User s Guide ...
Page 2: ......
Page 22: ...About This Guide Conventions xx HST 3000 Ethernet Testing User s Guide ...
Page 138: ...Chapter 3 Ethernet Testing MAC in MAC testing 116 HST 3000 Ethernet Testing User s Guide ...
Page 202: ...Chapter 5 TCP UDP Testing Loopback testing 180 HST 3000 Ethernet Testing User s Guide ...
Page 278: ...Chapter 9 Troubleshooting Resolving problems 256 HST 3000 Ethernet Testing User s Guide ...
Page 346: ...Glossary 324 HST 3000 Ethernet Testing User s Guide ...
Page 354: ...Index 332 HST 3000 Ethernet Testing User s Guide ...
Page 355: ......