Intel Express 100BASE-T4 - Manual (Page 27)

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Fast Ethernet Topology Rules A P P E N D I X A
Repeater rules
The 100BASE-T standard defines two types of repeaters — Class I
and Class II. The Express Stackable Hub is a Class I repeater. Class I
repeaters (sometimes called translational repeaters) limit the number
of repeaters in a physical domain to one.
However, the one-repeater maximum for Class I repeaters does not
limit the port density of 100BASE-T networks when stackable hubs
are used. Express Stackable Hubs can be stacked to form a single,
multi-port repeater where each repeater stack can be managed like a
single repeater unit.
Class I repeaters cannot be daisy-chained (connected to one another
using UTP cabling).