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Sierra Wireless 20070914 Cell Phone User Manual

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Introduction to the PinPoint X

Rev 3.0B Feb.08 9

addressforyourmodem,youcanuseaDynamicDNSservice

(suchasIPManager)totranslateyourIPaddressintotoa

domainname.

Caution: If you want to connect remotely to your PinPoint X using

TCP/IP, the IP address given to your modem by AT&T cannot be a

private or internal IP address (such as a custom APN) unless you are

on the same network or inside that network’s firewall (such as with

frame relay).

HSDPA Communication

ManyoftheGSMNetworkshavebeenexpandedtothefaster

andmorerobustHSDPAandUMTS.WhileHSDPAand

UMTSareadeparturefromtheGPRSarchitectureandusea

differentmethodofconnectivity,toprovidemoreseamless

service,thecarriersemployingthesemoreadvancedtechnol

‐

ogiesareretainingbackwardcompatibilitytoEDGEand

GPRS.

GSMNetworksuseSIMcardswhicharesmartcards

containingtheaccountholder’sdetails.ASIMcangenerallybe

movedfromonedevicetoanotherallowingforaccountporta

‐

bilityandflexibility.

HSDPA

HSDPA(High‐SpeedDownlinkPacketAccess)isacellular

technologyallowingforhigherdatatransferspeeds,upto14.4

Mbit/spercellinthedownlinkand2Mbit/spercellinthe

uplink.HSDPAusesAdaptiveModulationandCoding

(AMC),fastpacketschedulingattheNodeB(BaseStation)

andfast

retransmissionsfromNodeB(knownasHARQ‐

HybridAutomaticRepeatRequest)todelivertheimproved

downlinkperformancevs.UMTSandEDGE.

HSPDA(andHSUPAinthefuture)fallsbacktoUMTS,EDGE

orGPRS(inorderofprecedence).Thisfeatureallowsyouto

haveseamlessconnectivitynomatterwhereyourPinPointX

is.

UMTS

UMTS(UniversalMobileTelecommunicationsSystem)

supportsupto1920kbit/sdatatransferrates,althoughmost

userscanexpectperformanceupto384kbit/s.AUMTS

networkusesapairof5MHzchannels,oneinthe1900MHz

rangeforuplinkandoneinthe2100MHzrangefordownlink.

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