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Connectivity Rules
Ethernet (10Mbps) networks have the following connectivity rules:
? The maximum length of a twisted-pair cable segment is 100
meters. Cabling should be Category 3 or better (Category 5 for
100Base-TX connections).
? Between any two end-stations in a collision domain, there may
be up to five cable segments and four intermediate repeaters
(hubs, hub stacks, or other repeaters).
? If there is a path between any two end-stations containing five
segments and four repeaters, then at least two of the cable
segments must be point-to-point link segments (e.g., 10BASE-
T or 10BASE-FL), while the remaining segments may be popu-
lated (mixing) segments (e.g., 10BASE-2 or 10BASE-5).
Fast Ethernet (100Mbps) networks have the following connectivity
rules:
? The maximum length of a twisted-pair segment (that is, the
distance between a port in the hub to a single-address network
device such as a PC, server, or Ethernet switch) is 100 meters.
Cabling and other wiring should be certified as Category 5
UTP or shielded twisted-pair (STP).
? The maximum diameter in a collision domain is about 205
meters using two Class II hubs (or hub stacks).
? Between any two end-stations in a collision domain, there may
be up to three cable segments and two Class II hubs or hub
stacks.
Making Connections
25
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