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Technical Reference
Visit our website or
Wireless call us for a free quote.
Understanding your wireless choices.
Why go wireless? s(OSPITALSUSEWIRELESSTOEASILYSENDDATA
spectrum increases bandwidth and makes
Whether you can’t or won’t install cable, back to the system at the nurses’ station.
the signal resistant to RFI interference.
ORIFYOUJUSTWANTTHEFREEDOMsTH7IRELESSISIDEALFORHISTORICBUILDINGSATWIRELESS
"ECAUSE%- )2&)INTERFERENCERARELYAFFECTS
provides, you’ll find wireless networking where building codes prohibit new cables
the entire available bandwidth, data still
more practical and affordable than ever. or structural modifications.
gets through even if one or two frequencies
Today’s wireless networking is a reliable,
Wireless doesn’t always mean no wires.
are experiencing interference.
cost-effective technology that provides
A wireless network can significantly cut
Spread Spectrum is also resistant to
extraordinary mobility and flexibility. Users
down on the need for cabling but rarely
eavesdropping because it sends data over
can take their laptops throughout a building
eliminates cabling altogether.
more than one frequency at a time.
to work wherever they want. Wireless PDAs
Although wireless networks can be
There are two kinds of Spread Spectrum:
make it possible to enter real-time data for
entirely wireless, operating in ad hoc mode
&REQUENCY(OPPING3PREAD3PECTRUM&(33
applications such as inventory control.
in which wireless devices communicate
and Direct Sequence Spread Spectrum
Wireless enables you to quickly move
directly with each other, that is suitable
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'(ZBAND
computers—not only laptop computers but
only for very small networks. Most wireless
which enables support for high-bandwidth
also desktop PCs—where you need them.
networks operate in infrastructure mode.
applications while providing high reliability
Because wireless cuts down on cable costs
An infrastructure-mode wireless network
and reduced immunity to interference.
and labour, it can significantly reduce the
is built around a wired network. It can be
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cost of network moves and changes.
as simple as a wireless broadband router
The two techniques are incompatible,
Typical wireless applications. linked to a cable modem or as complex as a
and there are some important distinctions
s!HIGH
SPEEDLASERCONNECTIONISACOST
large corporate network. Wireless devices
between them.
effective substitute for fibre optic cable. communicate with each other and the
&(33DIVIDESTHEAVAILABLEBANDWIDTH
Use it between buildings in a campus network through a wireless access point.
INTO
-(ZCHANNELSBROADCASTING
in short, 400-ms bursts over one channel
environment when running fibre optic
Infrastructure-mode wireless also provides
before hopping to the next. Transmitters
cable is impractical or cost-prohibitive.
wireless devices with access to the resources
and receivers are synchronised to the
s5SEWIRELESSASABACKUPTOWIRED
on your wired network, such as servers,

same hopping pattern to ensure security.
connections to maintain mission-critical
printers, and Internet access.
Any data lost to interference is simply
links when disaster strikes.
An infrastructure-mode wireless net-
retrans mitted on a subsequent hop
s!TTRADESHOWSWIRELESSGIVESYOUQUICK
work with one acces

s point is referred to as
at a different frequency.
temporary connections.
a Basic Service Set (BSS). An Extended
DSSS is more common. It sends data
s7IRELESSMAKESREMOTETROUBLESHOOTING
Service Set (ESS

) is a wireless network that
REDUNDANTLYOVERA
-(ZBANDWIDTH
and testing easy.
includes two or more access points.
between transmitters and receivers using
s)NSHIP
TO
SHOREANDSHIP
TO
SHIPDATASpread Spectrum technology.
the same spreading pattern to decode
transfer, wireless enables operations from Most wireless networking—the primary
the data. Transmitters can be tuned to
basic communications to rescue efforts. exception being laser—uses a radio frequency
five frequencies to avoid interference.
s)30SAREUSINGWIRELESSFORBACKBONE(RF) technique called Spread Spectrum. Its
IEEE wireless standards.
connections and even to provide high-
modulation is used in all the common
Much of Spread Spectrum wireless is
speed access in customers’ homes.
WIRELESSSTANDARDSSUCHASAB
DEFINEDBYTHE)%%%STANDARD)T
s)NDUSTRIALLYWIRELESSISUSEDTOCONTROL
ANDG

has been revised several times, leading to
machinery and gather sensor data.
Spread Spectrum sends data across
subcategories defined by letter. The most
s7IRELESSMAKESACOST
EFFECTIVE
the availa

ble frequency band in a pseudo-
COMMONAREBANDGWHICH
alternative to a school computer lab.
random pattern. Using the entire frequency
cover most wireless devices in use today.
802.11 — This early wireless standard
PROVIDESSPEEDSUPTO-BPS"ECAUSE
Pure Networking 802.11g
Wireless Access Point with
SUPPORTSTWOENTIRELYDIFFERENT
Trade Show Application
Pure Networking 10/100
Switch (LW6004A),
802.11g 1-Port
METHODSOFENCODINGˆ&(33AND$333ˆ
Wireless USB Print there is often incompatibility between
Server (LEP0003A)
EQUIPMENTHASALSOHADPROBLEMS
Pure Networking
™
802.11g Wireless
dealing with collisions and with signals
Router with Switch reflected back from surfaces such as walls.
802.11a — This extension of the
Panasonic
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Printer
Network CALLED5NLICENSED.ATIONAL)NFORMATION
Security
)NFRASTRUCTURE5
.)) INTHE5NITED3TATES
colourCamera
Desktop PC with
Because the band has a higher frequency
Pure Networking and a larger bandwidth allotment than
Laptop with Pure 802.11g Wireless
Networking 802.11g PCI Adaptor
THE
'(ZBANDTHEASTANDARD
Wireless CardBus Adaptor
A common wireless application is to set up achieves speeds up to 54 Mbps.
temporary networks, such as at trade shows,
802.11b — This extension of the original
conventions, disaster relief centres, etc.
STANDARDBOOSTSWIRELESSTHROUGHPUT
FROM-BPSTO-BPS)TCANTRANSMITUP
to 100 metresFT UNDERGOODCONDITIONS
468
New Zealand: www.blackboxnz.co.nz – For Sales or Tech Support, call 0800-653-219.
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