The "5-4-3" rule is applicable to coaxial Ethernet segments with repeaters. The "5-4-3" rule states an Ethernet network has no more than five segments, four repeaters, and three active segments. This rule is enforced by network diameter and bit times.

In the IEEE 100BaseT specification, two types of repeaters are defined:

• Class I repeaters have a latency of 0.7 microseconds or less. Only one repeater hop is allowed.

• Class II repeaters have a latency of 0.46 microseconds or less. One or two repeater hops are allowed.

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