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Chapter 1 - System Description
BreezeACCESS VL System Manual
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1.1 Introducing BreezeACCESS VL
BreezeACCESS VL is a high capacity, IP services oriented Broadband Wireless
Access system. The system employs wireless packet switched data technology to
support high-speed IP services including fast Internet and Virtual Private
Networks. BreezeACCESS VL users are provided with a network connection that
is always on, supporting immediate access to the Internet and other IP services at
high data rates. The system is designed for cellular-like deployment, enabling the
system architecture to vary in size and structure. A system can include any
number of cells, each containing several Access Units for better coverage of
densely populated areas.
BreezeACCESS VL can support sensitive applications through authentication
and/or data encryption utilizing WEP or AES algorithm with 128-bit keys. FIPS
(Federal Information Processing Standards) 197 certified encryption algorithm is
optionally available for Access Units with HW revision C and higher (except to
AUS units). The system supports Virtual LANs based on IEEE 802.1Q, enabling
secure operation and Virtual Private Network (VPN) services and enabling tele-
workers or remote offices to conveniently access their enterprise network. The
system supports layer-2 traffic prioritization based on IEEE 802.1p and layer-3
traffic prioritization based on either IP ToS Precedence (RFC791) or DSCP
(RFC2474). It also supports traffic prioritization based on UDP and/or TCP port
ranges. In addition, it may use the optional Wireless Link Prioritization (WLP)
feature to fully support delay sensitive applications, enabling Multimedia
Application Prioritization (MAP) for high performance voice and video. The
implementation of MAP through the unique WLP protocol revolutionizes the
business model by increasing, for example, the number of simultaneous VoIP
calls per sector by as much as 500%.
BreezeACCESS VL products operate in unlicensed frequency bands in Time
Division Duplex (TDD) mode, using Orthogonal Frequency Division Multiplexing
(OFDM) modulation with Forward Error Correction (FEC) coding. Using the
enhanced multi-path resistance capabilities of OFDM modem technology,
BreezeACCESS VL enables operation in near and non-line-of-sight (NLOS)
environments. These qualities enable service providers to reach a previously
inaccessible and broader segment of the subscriber population.
BreezeACCESS VL is designed to enable construction of “mixed” cells, where it
can be used together with other BreezeACCESS products using GFSK
modulation, including BreezeACCESS II, BreezeACCESS MMDS, BreezeACCESS
XL and BreezeACCESS V.
BreezeACCESS VL products are currently available in the following frequency
bands: