Sierra Wireless 595U Appendix A: Glossary

Document 2130750. Rev 1.0 Oct.06 38
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Appendix A: Glossary
1X OneTimesRadioTransmissionTechnology(theʺonetimesʺ
referstothefrequencyspectrum).SupportsInternetconnec‐
tionswithdataratesupto153 Kbps.Actualspeeddependson
thenetworkconditions.Compareto1x‐EVDO.
1x-EVDO Ahigh‐speedstandardforcellularpacketdatacommunica‐
tions.
Rev.AsupportsInternetconnectionswithdataratesupto
3.1 Mbps(downlinkfromthenetwork)and1.8Mbps(uplink
tothenetwork).
Rev.0supportsInternetconnectionswithdataratesupto
2.4 Mbps(downlinkfromthenetwork)and153Kbps(uplink
tothenetwork).
Averagedataratesareroughly:forRev.A:600–1300Kbps
(downlinkfromthenetwork)and300–400Kbps(uplinktothe
network);forRev.0:400‐700Kbps(downlinkfromthe
network)and40‐80Kbps(uplinktothenetwork).
Actualspeeddependsonthenetworkconditions.Compareto
1X.
bps bitspersecond—Theactualdataspeedoverthetransmission
medium.
CDMA CodeDivisionMultipleAccess—Awidebandspread
spectrumtechniqueusedindigitalcellular,personalcommu‐
nicationsservices,andotherwirelessnetworks.Wide
channels(1.25 MHz)areobtainedthroughspreadspectrum
transmissions,thusallowingmanyactiveuserstosharethe
samechannel.Eachuserisassignedauniquedigitalcode,
whichdifferentiatestheindividualconversationsonthesame
channel.
CDMA 1X Alsoknownas1X,thisisahigh‐speedstandardforCDMA
cellularcommunications.
circuit switched cellular V.xxmodemcommunicationsoveracellularnetwork.Ituses
adedicatedconnectioncircuit,incontrasttopacket‐switched.
Theuserischargedbythecarrierforthedurationofthe
connection.
dormant ThepacketdataconnectionhasthelogicalPPPsessionleft
openwhiletheunderlyingphysicallink(theradiochannel)is
released.Whentrafficistoresume,aradiochannelisre‐
aquiredandtheoriginalPPPsessionresumes.