User Guide

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architectu re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.