Intellisystem IT-900-IPC Series User Manual page 82

Cable quality test: Green is good quality cable, Yellow is Poor quality cable, Red is water poured
cable, the attenuation value will be displayed when cable over 10 meters
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Advanced Test: test cable pair status, length, attenuation, reflectivity, impedance, skew and other
parameters.
Attenuation reflectivity: after link up, if reflectivity value is 0, it is the best quality communication
Impedance: after link up, if the impedance value is 100Ω, it is the best quality communication, the
range is generally in 85-135Ω.
Skew: After 1000M link up, when skew value is 0ns, it is the best quality communication, if over 50ns,
will cause a Bit Error Rate in the transmission.