Test-Um VALIDATOR-NT NT955 - Manual (Page 7)

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Test-Um NT955 Series
Ethernet Cable Certification
Speed and Performance Certification uses digital technology centered on
the latest advances in Gigabit Ethernet Transceivers. These new highly
integrated chips are capable of testing for noise in the network, faults in
the cabling wiring and even generating live data packets that stress the
cables to make sure they are able to support the equipment connected to
them. This is the heart of the Validator-NT Certifier.
To do Speed and Performance Certification Validator-NT measures
three specific levels of cable and connector conditions. Unless all three
of these levels are tested it is impossible to accurately determine a cable
run’s capability.
1. Measure TIA 568 Interconnect Specifications such as Opens,
Shorts, Miswires, Split Pairs and Reversals. The distance to
faults and length of cable runs are accurately pinpointed with
the use of both TDR and capacitance length measurement
techniques. The Validator-NT measures length up to a maximum
of 1500 feet or 457 meters.
2. Measure Pertinent Parameters of Noise and propagation delay.
NEXT, Return Loss, Attenuation, Amplitude and other noise
factors are tested using Signal to Noise Ratio measurements.
SKEW is measured using TDR (Time Domain Reflectometry) to
insure acceptable signal time delay differences between pairs for
Gigabit use.
3. Conduct a Bit Error Rate Test. BERT sends actual data
packets down specified cable runs at defined data rates and
quantities. Random code data is generated and checked for
errors at the maximum throughput of the link, full duplex.
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