202 Chapter 4: Bridges/Switches and LAN Design
Table 4-21 lists the specification that defines the Media Access Control (MAC) and Logical
Link Control (LLC) sublayers of the three LAN types, for comparison.
Table 4-22 lists the key Ethernet specifications and several related details about the operation
of each.
Table 4-21
MAC and LLC Details for Three Types of LANs
Name
MAC Sublayer
Spec
LLC Sublayer
Spec
Other Comments
Ethernet Version 2
(DIX Ethernet)
Ethernet
--
This spec is owned by Digital,
Intel, and Xerox.
IEEE Ethernet
IEEE 802.3
IEEE 802.2
This also is popularly called
802.3 Ethernet.
Token Ring
IEEE 802.5
IEEE 802.2
IBM helped with development
before the IEEE took over.
FDDI
ANSI X3T9.5
IEEE 802.2
ANSI liked 802.2, so it just
refers to the IEEE spec.
Table 4-22
Ethernet Standards
Standard
MAC Sublayer
Specification
Maximum Cable
Length
Cable Type
Pairs
Required
10Base5
802.3
500 m
1
50 ohm thick coaxial
cable
--
10Base2
802.3
185 m
1
50 ohm thin coaxial
cable
--
10BaseT
802.3
100 m
1
Category 3, 4, or 5
UTP
2
10BaseFL
802.3
2000 m
2
Fiber
1
100BaseTx
802.3u
100 m
2
Category 5 UTP
2
100BaseT4
802.3u
100 m
2
Category 3 UTP
4
100BaseT2
802.3u
100 m
2
Category 3, 4, or 5
UTP
2
100BaseFx
802.3u
400/2000 m
3
Multimode fiber
1
100BaseFx
802.3u
10,000 m
Single-mode fiber
1
1000BaseSx
802.3z
220-550 m
Multimode fiber
1
ch04.fm Page 202 Monday, March 20, 2000 5:02 PM