Filter
Top Products
Chapter 1 INTRODUCTION
This chapter describes the features of the Switch and some background information about Fast
Ethernet switching technology.
Fast Ethernet Technology
The growing importance of LANs and the increasing complexity of desktop computing applications
are fueling the need for high performance networks.
A number of high-speed LAN technologies have been proposed to provide greater bandwidth and
improve client/server response times. Among them, 100Base-TX (Fast Ethernet) provides a
non-disruptive, smooth evolution from 10Base-T technology. The non-disruptive and smooth
evolution nature, and the dominating potential market base, virtually guarantee cost effective and
high performance Fast Ethernet solutions in the years to come.
100Mbps Fast Ethernet is a standard specified by the IEEE 802.3 LAN committee. It is an
extension of the 10Mbps Ethernet standard with the ability to transmit and receive data at
100Mbps, while maintaining the CSMA/CD Ethernet protocol. Since the 100Mbps Fast Ethernet is
compatible with all other 10Mbps Ethernet environments, it provides a straightforward upgrade
and takes advantage of the existing investment in hardware, software, and personnel training.
Switching Technology
Another approach to pushing beyond the limits of Ethernet technology is the development of
switching technology. A switch bridge Ethernet packets at the MAC address level of the Ethernet
protocol transmitting among connected Ethernet or Fast Ethernet LAN segments.
Switching is a cost-effective way of increasing the total network capacity available to users on a
local area network. A switch increases capacity and decreases network loading by dividing a local
area network into different segments, which don’t compete with each other for network
transmission capacity.
The Switch acts as a high-speed selective bridge between the individual segments. The Switch,
without interfering with any other segments, automatically forwards traffic that needs to go from
one segment to another. By doing this the total network capacity is multiplied, while still
maintaining the same network cabling and adapter cards.
For Fast Ethernet networks, a switch is an effective way of eliminating problems of chaining hubs
beyond the “two-repeater limit.” A switch can be used to split parts of the network into different