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data nodes, so they provide both on-campus mobility and a voice/data convergence
platform for next-generation applications.
Wireless interfaces are still more expensive than their cabled counterparts, but prices
continue to drop. LAN cards are now in the $250 range, and the access points, which
support up to 250 users, are $1,200 to $1,300. Wireless LANs can also be used as point-
to-point or point-to-multipoint bridges between buildings, providing a cost-effective
alternative to T1 lines. They have a range of up to two miles if there is a clear line of
sight between the locations. Inside buildings, where transmissions may have to go
through walls, the range is about 300 feet.
Contrary to many perceptions, wireless LANs are quite secure. Wireless LANs are
actually more secure than the typical wired LAN. They use spread spectrum and hop
around the different frequencies every tenth of a second, and they break the payloads
down into sub-bits. They also have more built-in authentication.
6.3.2 BreezeCom and Cisco
They provide a complete wireless local loop (WLL) solution based on voice over IP
technology (VOIP). The BreezePHONE conforms to H.323, the ITU standard for real-
time voice and multimedia application over IP (Internet protocol). This standard is
supported by the major hardware and software vendors providing voice over
Internet/Intranet products.
The BreezePHONE uses frequency-hopping, spread spectrum radio technology and
operates in the license-free 2.4 GHz ISM (industrial, scientific and medical) band. The
DSP (Digital Signal Processor) design of the BreezePHONE allows it to operate with the
highest reliability with data speeds of up to 3 Mbps with single cell coverage up to 5 km
radius.
The solution is comprised of the BreezePHONE Remote Unit (BRU), BreezePHONE
Access Point (BAP) and a gateway connection to the Public Switched Telephone
Network (PSTN) using Cisco 2600/3600/AS5300 platforms with the Cisco Voice/Fax
network module, and Cisco IOS.
(3 pages)
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