Once the current token-based infrastructure is depreciated or new application
support becomes necessary, it is reasonable to assume that these networks will transition to Ethernet.
28 Based on the observations by Dr. Bob Metcalfe, founder of Ethernet
16 Chapter 1
ultimately, ???Domination.??? During the first stage, which lasted from the mid-1970s to the
mid-1980s, Ethernet was a new entrant in a small market (comprising mostly research
and development initiatives), where it competed against the likes of the Aloha protocol.
During the second stage, lasting approximately from the mid-1980s to the mid-1990s,
Ethernet faced some stiff competition in a fairly impressive growth market, stimulated
Factors of
Comparison
Ethernet
(IEEE 802.3)
Token Bus
(IEEE 802.4)
Token Ring
(IEEE 802.5)
FDDI
(ANSI X3T9.5)
Service
Connectivity
Connectionless Connectionless Connectionless Connectionless
Bandwidth 10M 10M 4M/16M 100M
Engineering Simple Complex Easy Complex
Reliability High High High Very high
Performance
Low Load
Heavy Load
Good
Poor
Poor
Excellent
Poor
Excellent
Good
Excellent
Priorities
Supported
No Yes Yes Yes
Deterministic No More than 802.
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