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APPENDIX B Intel Express 100BASE-TX Stackable Hub
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The following table lists the cable and connector types and the coding
scheme that each media specification uses:
Media
specification
Cable type(s) Connector
type(s)
Coding
scheme
100BASE-TX Cat. 5 UTP
(2-pair wire)
RJ-45 4B/5B
100-ohm STP
(2-pair wire)
RJ-45
100BASE-FX 62.5/125 micron
fiber optic cable
(2 multimode fibers)
SC or ST 4B/5B
100BASE-T4 Cat. 3, 4, 5 UTP
(4-pair wire)
RJ-45 8B6T
Repeater Rules
There are two types of repeaters defined in the 100BASE-T standard—
Class I and Class II repeaters. The Express hub is a Class I repeater.
Class I repeaters (sometimes called “translational repeaters”) limit the
number of repeaters in a physical domain to one, because both
signaling systems are typically supported (that is, both 100BASE-
TX/100BASE-FX and 100BASE-T4).
However, the one repeater maximum for Class I repeaters does not
limit the port density of 100BASE-T networks when stackable hubs
are used. The Express hubs can be stacked to form a single, large-
number port repeater where each repeater (or repeater stack) can be
managed like a singular repeater unit.