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the IS-634 specification from TIA. The IOS,which is a refinement of the IS-634 specification,has been broadly embraced bycdmaOne operators worldwide. Ericsson hasdeployed several IS-634 and IOS networks,and supplied equipment to the base stationsubsystem (BSS) of the world's first commercialimplementation of the IOS(Figure 3).The primary nodes in most present-dayCDMA systems are the MSC, the radioaccessnetwork, a home location register(HLR), an interworking function (IWF),and a handheld device markup language(HDML) server. Other key elements includeoperations and network management systems,voice-mail servers and short messageservice centers (SMSC).In most cdmaOne systems, the interworkingfunction is an external piece ofequipment that provides subscribers withdata services and Internet connections.However, for more efficient and costeffectivedelivery of data services, Ericsson'sCDMA network offers the choice of embeddingthe interworking function and packetdatarouters in the BSC.The HDML server is used for deliveringInternet content to cdmaOne phones thatare equipped with HDML microbrowsers.In the near future, wireless application protocol(WAP) microbrowsers will also be introduced.Radio base stationsEricsson's cdmaOne radio base stations(RBS) and BSCs support the current IOS interface.The RBS 1106 and 1107—which isEricsson's most recent RBS product forCDMA—were designed using direct operatorinput for requirements such as:• rapid network build-out;• support of high-capacity and long-rangecoverage;• low operating costs;• high reliability;• simple operation;• low deployment costs; and• support of future generations of technology(upgradeable to third-generation systems).Available for operation in the 800 and1900 MHz frequency bands, the RBS 1106is a modular product that consists of a mainunit and up to three isolated remote units(Figure 4). It is a true macro-cellular product(15 watts of output power at the antenna)in a micro-cellular package. The RBS1107, which is a multicarrier version, wasFigure 3Step 1: The Ericsson BSS, which can interoperate with any present-day cdmaOne network.Figure 4The Ericsson RBS 1106—typical installationconfiguration.Ericsson Review No. 2, 2000 61