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What is INSTEON Technology |
Языки - Английский |
What is INSTEON Technology? Simply put, INSTEON technology is a dual-band mesh topology employing ac-power lines and a radio-frequency (RF) protocol to communicate with and automate home electronic devices and appliances, which normally work independently. A typical end-user network consists of plug-in, wired-in, and battery-powered modules that are set up via a PC or dedicated controller using plug-and-tap technology Each device has its own unique ID, eliminating the need to set addresses or manipulate code wheels. Linking two devices is as simple as pressing and holding the ON button on the first controller device for 10 seconds, then doing the same on the second device. Upon installation, the components form a peer-to-peer, unsupervised network requiring no routing tables. Sending and receiving communications either wirelessly or over the power lines, each device acts as a repeater capable of resending commands should they be corrupted or dropped. The result is a system that responds with imperceptible delays and becomes more reliable as it expands. On the design side, the technology also involves software, USB and RS-232 connectivity, with Ethernet capabilities for interfacing to a LAN and the Internet on the not-too-distant horizon. Development kits and a prototyping module are available, which include membership in the INSTEON development alliance and provide access to the development forum. A full set of development support services, including e-mail and telephone consultation, are also in the mix. Peer-to-Peer Networking Providing that layer of reliability, any component can repeat messages, relaying information from device to device . Of course, this applies strictly to INSTEON signals; modules can send and receive X10 signals over the power lines, but will not repeat and/or amplify them. Signal Repetition Theoretically sound, this concept could imply that the designer needs to glut a system with devices to insure total reliability, which appears not to be the case. Better put, an INSTEON network will retain its integrity either as it expands or in its accommodation of larger installations with challenging layouts. More devices may address line-of-site issues on the RF side or bring more sophisticated control to upper and lower floors on the power lines. Again, the more signal paths the better. How It WORKS Each device in the system receives a unique ID, of which there are 16,777,216. Support is available for up to 65,536 device types and up to 256 groups per device. There is no limit to the number of members within a group except memory: basic requirements for the INSTEON engine are 80 bytes of RAM and 3 KB of ROM. A typical application involving basic light switching and dimming requires 256 bytes of RAM, 256 bytes of EEPROM, and 7 KB of flash memory. Furthermore, the power-line protocol employs bi-phase shift keying (BPSK) modulation and specifies a minimum transmit level of 3.16 Vp-p into a 3½ load. Minimum receive level is 10 mV. Phase-bridging functions fall into the hands of hardware or the RF protocol. Relying on frequency shift keying (FSK) modulation, the RF protocol operates in the 904-MHz band. This topology yields a sensitivity of -103 dBm and supports communications at distance up to 150 ft., assuming and unobstructed line-of-site environment. Again, each device in the network acts as a repeater, so operating distance increases proportionately as the system expands. A North American type system will employ both sides of the power line, which splits at the home's junction box into a pair of two-wire, 110-Vac lines: Phase 1 and Phase 2. One half of the network resides on the Phase 1 line, the other half on Phase 2. With the exception of any X10 devices and the PC or controller, all communications over the network are via RF, the power lines, or a combination thereof. Comparable TECHNOLOGIES Although considered viable competitors, it is difficult to compare the likes of ZWave, ZigBee, Bluetooth, Wi-Fi, Home-Plug, Universal Powerline Bus (UPB), and high-speed power-line protocols to INSTEON's dual-band networks. Each having its niche market, the majority of these technologies use a single-band approach, power line or RF, and, reportedly, not all focus purely on automation applications. Be that as it may, INSTEON makes the comparison by pointing out ZWave and ZigBee as requiring extremely complex routing strategies, Bluetooth is short on range, Wi-Fi and UPB as being too expensive, and X10 lacking in flexibility and reliability.
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