NCR 7454 - Page 24

1-12 Chapter 1: Product Overview
• IntegratedantennathatmeetstherequirementsofPCMCIA(PC
Card)ExtendedType2carddefinition(amaximumof5‐cm
additionallength).
• PowerconsumptionwithinthecapabilitiesofthePCMCIA
daughter‐card.
• Signalingrequirementswithinthecapabilitiesoftheterminal
PCMCIAinterface.Themainrestrictionisthat
DMAtransactions
arenotsupportedoverthePCMCIAinterface.
• Devicedriversforthetargetedoperatingsystemmustexist.
• Appropriateinfrastructure(serversupport,BaseStations,Ceiling
Antennas,etc)mustbepresentintheinstallationsite,andthe
maximumRFrangeofthewirelesssystemmustnotbeexceeded.
Interoperability‐While
the802.11standardprovidesaninteroperable
protocoldefinition,therearevendor‐specificextensionstotheprotocol
thatencourageuserstostaywithonesupplier’sequipment.Thisalso
appliestowirelessinfrastructureandaccesspoints,802.11doesnot
governthisoperation.MixingofRFsuppliersonasiteisnot
recommended
untiltheRFsuppliershavedemonstrated
interoperability.
Thewirelessnetworksoperateatspeedsof1‐11Mbpswith2percent
packetlosstypical.Theapplicationdevelopermustbeawareofthe
performancelimitationsanddesignapplicationsthatareacceptableto
thecustomerwhenrunovertheslowernetwork.
RemoteWakeupover
thewirelessnetworkisnotpossiblebecausethe
cardsdonotsupportit.Analternativeistousethesystemreal‐time
clockwakeupatascheduledtime.
DependingontheOSenvironment,RemoteBootmaybesupported,
butduetotheslownetworkspeedalargeboot image
maytakean
unacceptablylongtimetoload.Theapplicationdeveloperneedsto
ensurethattheloadisofreasonablesize.