Appendix C
Measurement Methods and Limits
C-14
Field Tester Accuracy
It is difficult to determine which type of tester may be required for certification.
Generally, Level I testers are used by LAN managers for casual troubleshooting.
Level II and Level III testers are used by cable installation contractors.
What does “accuracy” mean?
Accuracy is the difference between the measured value reported by the LANTEK
tester and the actual value. Accuracy is a function of the characteristics of the field
tester and link transmission characteristics.
Requirements for Level I, II, and III Accuracy
Accuracy requirements are specified in the TIA/EIA 568-B and ISO Class-E
specifications. A CAT6 tester is required to meet Level III requirements from
1 to 250 MHz.
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