Test-Um VALIDATOR-NT NT955 - Manual (Page 66)

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Test-Um NT955 Series
5. Running Manual Tests
Manual Tests performs individual tests on Data, Phone, or 2-wire cables
based on defined test standards. The tests that can be performed for
each selected cable type are listed on the Manual Test screen for that
type (Figure 5.2).
5.1. Data Cables
Data Cables are defined as cables wired to T568A/B pin numbering and
pairing. Validator-NT will perform full Signal to Noise Ratio and Skew
testing as part of the cable test. Speed testing is done with the Bit Error
Rate Test (BERT). You can also send tone over the cable, check length,
flash a hub or do a Speed Test with BERT.
Note: The TP610 Remote Wiremappers are designed to report wiremap
length and Skew results only. A Link Test Error message appears
“Unable to Measure SNR.” To measure Signal to Noise Ratio you must
use the Validator Smart Remote unit.
Length Constant is used for length measurement and is adjusted in
.1pF increments by pressing the up and down arrow keys. The displayed
cable length is recalculated as the length constant is changed. This
allows an unknown length constant to be determined by attaching a
known length of cable and running the test. The length constant can
be varied up or down until the displayed length matches the measured
length. The displayed length constant is then the correct value for that
cable. This same adjustment feature is on both the Phone and 2-Wire
test screens. (Figure 5.1)
Cable Type pF/ft. pF/m
Data Cable
CAT3 19.0 62.5
CAT5/CAT5E/CAT6 15.0 49.0
Coaxial Cable
RG58 27.5 90.0
RG6, RG11, RG59 16.25 53.0
Security Wire
22AWG, Jacketed 24.0 78.5
22AWG, Unjacketed 14.0 46.0
20AWG, Unjacketed
16.0 52.5
18AWG, Unjacketed 17.0 55.5
Figure 5.1 Typical Cable Length Parameter
Validator TM Running Manual Tests Validator TM Running Manual Tests