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GPRS[2004-12-7][]GPRSGSMGSMGPRSTCP/IPGPRSGeneralPacketRadioServiceGSMGSMGSMGPRSGPRSTCP/IPGPRSTCP/IP1GPRSGSMGPRSSGSNMSCSGSNGGSMGGSNInternetX.251InternetIPGGSNSGSNIPTCP/IPIPMC35GPRSSGSNGPRSIPInternetIPGPRSIPIPIPIPIP2TCP/IPMC35CMOSWinbondW77E58MCUMCS-5180511.53.0CMOS4.5V5.5V32KBROM1KBSRAM40MHz13316W77E581MC35MC35GPRS2MAX232PC2MC35GSMGSM900/GSM18002CSDSMSFAXGPRSCS1-CS4GPRS2ATMC3540ZIFGPRS8SMASIMSubscriberIdentityModule11I/ORST1I/O0.45V0.1mA3.5sfout,min=0.16Hzfout,max=1.53Hz0.01mARXD2ITxD3OCTS4ORTS5IRS232PCRS232SGGND80SGGNDRS232GNDPCInternetCTSRTSA6RS485B7I/ORS4851203TCP/IPGPRSW77E58TCP/IPTCP/IPWAN22TCP/IPHTTPTelnetFITSMTPSNMPTCPUDPIPARPRARPICMPIGMPEthernetX.25SLIPPPPapplicationHTTPtransport2TCP2TCPInternetInternetIPGPRSIPARP/RARPIPICMPlinkGPRSIPOverPPPMC35PPPGPRSTCP/IPTCP/IPTCP/IPROMMC35GPRSHTTPGPRSPDPATGPRSMC353MAX2321MC35SIMGPRSGPRSGPRSTCP/IP8MC35GPRSGPRS20021