Appendix A
Test Standards
Page A-11
for the needed frequencies rather than attempting to re-
certify wiring for performance that is higher than needed
for the network to operate properly.
Table 7. 10BASE-T Pass/Fail Limits
Length
≤
100 meters
Characteristic
Impedance
100 + 25
Ω
NEXT
> 31 dB @ 5 MHz
>27 dB @ 8 MHz
>26 dB @ 10 MHz
(NEXT > 26-15log(f/10)
where: f = signal frequency in
MHz
Attenuation
< 11.5 dB
Split Pair
NEXT < 20 dB (8 - 10 MHz)
Resistance
<9.9
Ω
Table 8. 4 Mbps Token Ring UTP Pass/Fail Limits
Length
≤
100 meters
Characteristic
Impedance
100 + 25
Ω
NEXT
> 31 dB @ 5 MHz
>28 dB @ 8 MHz
>26 dB @ 10 MHz
Attenuation
< 7 dB @ 5 MHz
< 9 dB @ 8 MHz
< 10 dB @ 10 MHz
Split Pair
NEXT < 20 dB (8 - 10 MHz)
Resistance
< 9.9
Ω
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