Lookup • Lookup refers to the things that you can do with the lookup services that are determined via discovery • Lookup is similar to a name server – A process – Keeps track of all services that have joined a Jini community • Differs from a name server – Richer set of semantics than provided by traditional name server | Bluetooth™ and Java™ Technologies in the Wireless Environment Michael T. Portwood, MS President & CEO Exuberance, LLC Agenda What is Bluetooth™ wireless technology Technology Overview Weaknesses Strengths What is Jini™ technology Bluetooth, Jini™ technology, and the Wireless Environment Conclusion Question & Answer What is Bluetooth™ Wireless Technology Overview Technology started by Ericsson Named after 10th century Viking king (Harald Blatand) A global wireless technology specification “Always on” communication Radio frequency based Inexpensive Intended for Portable devices Desktop machines Peripherals Bluetooth™ Wireless Technology Details Baseband protocols Circuit switching Packet switching Uses 24 GHz globally available unlicensed ISM radio band Effective range is 10 meters Slow communication rate (721Kbps) Small number of stations 8 devices / piconet 3 voice channels Secure Spread spectrum Comparison of Wireless Technologies Feature & Function Infrared Wireless LANs HomeRF Bluetooth™ Connection Type Infrared, narrow beam Spread spectrum Spread spectrum Spread spectrum Spectrum Optical 850 nm RF GHz RF GHz RF GHz Transmission Power 100mW 100mW 100mW 1mW Data Rate 16Mbps 1Mbps, 2Mbps 1Mbps, 2Mbps 1Mbps Range 1 meter 100 meters Typical home 3 meters Supported Devices 2 127 8 Voice Channels 1 VOIP 6 3 Addressing 32 bit physical ID 48 bit MAC 48 bit MAC 48 bit MAC Bluetooth™ Technology Strengths Inexpensive Superior range compared with IR Omnidirectional, not requiring line of sight Designed for ad hoc networking Both voice and data channels Well defined specification Large number of implementing companies Bluetooth™ Technology Weaknesses Slow communication rate (1 Mbps) Short networking range Limited number of network connections Large and complex specification (over 1000 pages) Bluetooth™ Wireless Technology Application Areas Pure computing applications Presentations Card Scanning Synchronizing Data Remote Synchronization Printing Scanners | Bluetooth™ and Java™ Technologies in the Wireless Environment Michael T. Portwood, MS President & CEO Exuberance, LLC Agenda What is Bluetooth™ wireless technology Technology Overview Weaknesses Strengths What is Jini™ technology Bluetooth, Jini™ technology, and the Wireless Environment Conclusion Question & Answer What is Bluetooth™ Wireless Technology Overview Technology started by Ericsson Named after 10th century Viking king (Harald Blatand) A global wireless technology specification “Always on” communication Radio frequency based Inexpensive Intended for Portable devices Desktop machines Peripherals Bluetooth™ Wireless Technology Details Baseband protocols Circuit switching Packet switching Uses 24 GHz globally available unlicensed ISM radio band Effective range is 10 meters Slow communication rate (721Kbps) Small number of stations 8 devices / piconet 3 voice channels Secure Spread spectrum Comparison of Wireless Technologies Feature & Function Infrared Wireless LANs .
