Chapter 3
3-10
Table 3-1. IEEE 802.3 Network Specifications
Thick
(10Base2)
Thin
(10Base5)
Twisted-Pair
(10BaseT)
Media Thick coaxial cable Thin coaxial cable Unshielded twisted-
pair
1
External
devices
required
NIC
2
and external
transceiver
NIC NIC
Topology Bus Bus Star, Tree
Max.
Segment
Length
3
500 meters
(1625 feet)
185 meters
(605 feet)
100 meters
(328 feet)
Max.
Devices per
Segment
100 30 12
Max.
devices per
network
1024 1024 1024
1
Detailed requirements for unshielded twisted-pair wiring are described in the
section, Wiring Requirements.
2
NIC (Network Interface Card) such as the Asanté MacCon3 NB for the
Macintosh II family or EtherPaC for the IBM PC and compatibles.
3
A twisted-pair link is equivalent to one segment.
Note: All 802.3 networks run at 10Mbps.
In addition to observing the requirements above, follow the "5-4-3 rule" to be sure
that your configuration does not exceed the maximum data transmission path
(the longest path through any given network). The 5-4-3 rule describes the
10BaseT Draft 10 maximum path. Between any two devices on the network, you
may have five segments in series, four repeater or concentrator sets, three
populated segments (coaxial networks only). The maximum path includes the
connections for the two devices. For backbone networks, consider these factors:
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