Extricom EXRP-20E, Руководство пользователя

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The Extricom WLAN System User Guide 3
Chapter
1
Introduction to the Extricom Wireless
LAN System
A Wireless Local Area Network (WLAN) based on the IEEE 802.11 standard enables laptops,
PDAs, phones, and other “Wi-Fi” equipped devices to wirelessly connect to the enterprise network.
However, large scale deployments of traditional cell-based WLANs, in which each access point
(AP) operates on a different channel than that of adjacent APs, have been hindered by issues such as
poor coverage, low capacity, high-latency mobility, and expensive interference analysis or site
survey and maintenance costs.
Extricom’s WLAN, on the other hand, takes a different and novel solution approach, by avoiding
the coverage and capacity trade-offs of traditional cell-based WLAN architecture. In addition, the
need for cell planning and interference analysis, a highly expensive aspect of owning a WLAN, is
also eliminated. Finally, Extricom’s innovative approach does away with most WLAN maintenance
tasks. Extricom’s WLAN System is specifically designed to provide increased network capacity,
seamless mobility, high level of security, and easy installation and configuration.
Overview of the Extricom WLAN System
The Extricom WLAN consists of a wireless switch (EXSW-400/800/1200/2400, &EXSW-1600
based on the Multi Series 1000 platform) connected to a set of UltraThin™ APs (EXRP-20/40/30n
and EXRP-20E/40E/40En). The Extricom WLAN system eliminates the concept of cell-planning
and replaces it with the “Channel Blanket” topology. In this topology, each Wi-Fi radio channel is
used on every access point to create continuous “blankets” of coverage. By using multi-radio APs,
the Extricom system is able to create multiple overlapping Channel Blankets from the same
physical set of devices, as illustrated in Figure 1.
Figure 1: Four Channel Blanket Coverage