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Table 3-4. Maximum Allowable Attenuation
Cable Type
STP (IBM Types 1 and 2
Voice Grade UTP (IBM Type 3) 56 dB/Km
STP (IBM Types 6 and 9)
3.6
IMPEDANCE
The characteristic impedance for UTP cable is 100 ohms 15%. For
STP cable, the characteristic impedance is 150 ohms 10%.
3.7
CROSSTALK
Is caused by signal coupling between the different cable pairs
contained within a multi-pair cable bundle. In shielded pair cables,
the effects of crosstalk are minimized.
3.8
NOISE
Can be caused by either crosstalk or externally induced impulses.
If noise induced errors are suspected, it may be necessary to re-
route cabling away from potential noise sources (motors,
switching equipment, high current equipment), or to ensure that
the electrical wiring in the area is properly wired and grounded.
WARNING: It is the responsibility of the person who sells the
system of which the adapter will be a part to ensure that the total
system meets allowed limits of conducted and radiated emissions.
Table 2:
at 4 Mbps
22 dB/Km
33 dB/Km
NETWORK CONNECTIONS
at 16 Mbps
45 dB/Km
131 dB/Km
66 dB/Km
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