Sierra Wireless Compass 597 Guide de l'utilisateur télécharger pdf (Page 57)

Document 2130972. Rev 1.0 Apr.08 57

Appendix A: Glossary

1X OneTimesRadioTransmissionTechnology(theʺonetimesʺ

referstothefrequencyspectrum).SupportsInternet

connections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1.8 Mbps(uplink

tothenetwork).

Rev.0supportsInternetconnectionswithdataratesupto

2.4 Mbps(downlinkfromthenetwork)and153 Kbps(uplink

tothenetwork).

Averagedataratesare:forRev.A:450–800 Kbps(downlink

fromthenetwork)and

300–400 Kbps(uplinktothenetwork);

forRev.0:400‐700 Kbps(downlinkfromthenetwork)and

40‐80 Kbps(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communications

services,andotherwirelessnetworks.Widechannels 

(1.25 MHz)areobtainedthroughspreadspectrumtransmis‐

sions,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.

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‐acquiredandtheoriginalPPPsessionresumes.

ESN Electronic

SerialNumber—Theuniquefirst‐generationserial

numberassignedtothemodemforcellularnetworkuse.

ComparetoMEID.

ExpressCard™ Add‐inmemoryandcommunicationscardsforportable

computers.ExpressCardisatrademarkofthePCMCIA.

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