Утасгүй технологи Zigbee, WiFi ба 433 МГц тэдгээрийн шинж чанарууд

Утасгүй технологи Zigbee, WiFi ба 433 МГц тэдгээрийн шинж чанарууд

Zigbee, WiFi болон 433MHz нь богино зайн утасгүй холбооны гурван өөр технологи юм. Технологи бүр өөрийн давуу болон сул талуудтай.

Zigbee бол бага хүч юм, өндөр найдвартай, утасгүй сүлжээний технологи. Чиглүүлэгчийг ашигласнаар, зөвхөн сүлжээний хамрах хүрээг хялбархан өргөжүүлж, тохируулах боломжтой, but also the “blind spot” in wireless communication environment can be eliminated. Нэмж хэлэхэд, Zigbee supports star, tree and mesh topologies. Иймээс, Zigbee is well-suited for both simple and complex built environment. Compared to the WiFi, Гэсэн хэдий ч, Zigbee’s data rate is 250kbps, lower than WiFi’s 11Mbps-54Mbps. That makes Zigbee inappropriate for high data rate applications, such as internet surfing, large file downloading or uploading. For restaurant and catering industry, Гэсэн хэдий ч, the data exchanged between server and terminals generally are just small amount. Иймээс, Zigbee is a quite suitable technology for ordering application.

WiFi can support high-data-rate applications. It also supports “always-on” feature, which makes the WiFi attractive for some applications. Гэсэн хэдий ч, it has some drawbacks which have been noticed by the consumers, such as high power consumption, low reliability, long reconnection time, гэх мэт.

433MHz technology has been widely used in China for restaurant ordering application. Since it uses relatively low frequency band, its wireless signal can be transmitted further than Zigbee and WiFi, which operates in 2.4GHz band. Гэсэн хэдий ч, the data rate of 433MHz is only 9.6kbps, much lower than WiFi and Zigbee’s data rate. Иймээс, 433MHz suits the application in which only small amount of data needs to be transmitted. Нэмж хэлэхэд, same as WiFi, 433MHz supports star topology only, which may cause “blind spot” within the wireless network coverage area.

Different from the WiFi’s “always-on” feature, in Zigbee and 433MHz system, the wireless link is established only when there is data need to be transmitted. This mechanism can dramatically reduce the interference to other devices in the network. The power consumption of the device is also reduced. Гэсэн хэдий ч, If “always-on” is requested in Zigbee or 433MHz system, a function can be designed in the application software to support this feature.
(Эх сурвалж: Shehzhen Seabreeze Smart Card Co.,Ltd.)