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Measurements
Appendix A
Wiremap
The wiremap measurement checks for proper end to end continuity and pairing.
Problems that can be detected are:
·
Short circuit
·
Open circuit
·
Reversed pairs
·
Transposed pairs
Split pairs
·
·
Shield continuity faults
Length
The length measurement determines the electrical length of the cabling run
under test. Length measurement requires accurate cable nominal velocity of
propagation (NVP) setting to yield specified accuracy. NVP values are
automatically loaded when you select a cable from the built-in database.
Accuracy
Resolution
Minimum Distance
Maximum Distance
Propagation delay and skew
The Propagation delay function measures the one way propagation delay over
each pair of the cabling run under test.
Accuracy
Resolution
Minimum Delay
Maximum Delay
Delay Skew
Near end crosstalk (NEXT)
Measures near end coupling between pairs in the cabling run under test.
Measured at both ends of cabling over 6 pair combinations.
Frequency Range
Frequency Step Sizes
Resolution
Dynamic Range
Baseline Accuracy
± 4% or ± 2 feet (0.6 M), whichever is greater
± 1 feet (0.3 M) < 100M
0 feet (0 M)
1,100 feet (330 M)
± 4% or ± 1 nanoseconds, whichever is greater
± 1 nanoseconds
0 nanoseconds
2,000 nanoseconds
Calculated as the difference in nanoseconds
between the longest and shortest measured
propagation delay among the four pairs of a single
cabling run
1 – 350 MHz
125 kHz, 250 kHz, 500 kHz, 1 MHz , set
automatically based on selected standards
0.1 dB
90 dB or 25 dB beyond Category6 basic link limit,
whichever is higher
40% better than TIA Level III requirement
1
2
Specifications 141
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