Recently, the demand for increased network capacity and speed are on the
rise, driven by the need to connect more computers to networks, and handle more data such as voice and image data. In some cases, computers that
run software which demand faster performance are directly connected using Fast Ethernet. In addition, backbone LANs are increasingly using Gigabit Ethernet that delivers speeds of one gigabit per second (1000Mbps)
over conventional FDDI (Fiber Distributed Data Interface) networks that
deliver speeds of 100Mbps.
●Other LAN standards
Several types of LAN standards are summarized below.
Standard
Standards
Method of Transmission
organization transmission
speed
FDDI
ANSI
Radio wave
or infrared
ray
1~11Mbps
A dual ring topology that is
capable of data communication, even if there is an
interruption in a cable.
(The network normally operates one of the two
rings.)
Usable anywhere within
the communication area,
providing freedom of
movement. Wireless LANs
based on radio wave
transmission are relatively
unaffected by obstructing
objects, with a transmission distance of around
100 meters. Wireless
LANs based on infrared
ray transmission cannot
work around obstructing
objects.
FDDI
Abbreviation for “Fiber Distributed Data
Interface.”
Reference
ANSI
ANSI is a private organization whose
aim is to unify and develop standards
for the US industry. Many ANSI standards have become de facto global
standards such as ASCII code, SCSI,
and FDDI.
Abbreviation for “America National
Standards Institute.”
Technology element
IEEE 802.11
committee
100Mbps
Reference
Chapter 9
Wireless
LAN
Fiber optic
cable
Characteristics
FDDI
Dual topology using fiber optic cable
Small LAN
connected to
backbone LAN
Router
Backbone LAN
Router
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