Différences

Cette page vous donne les différences entre la révision choisie et la version actuelle de la page.

Lien vers cette vue

how_smartphones_connect_using_bluetooth [2013/06/05 04:24] (Version actuelle)
treva177 created
Ligne 1: Ligne 1:
 +How Bluetooth Works 
  
 +In the modern age of digital technology, wireless usage of different units are inevitable. Should you get Smartphone you'll notice that it uses this same kind of technology, but how does this work? Here's an explanation of the whole wireless mystery [[http://www.handheldgpsnavigatorsite.com/|what to look for when buying a handheld gps]] . 
 +
 +Wireless devices will generally operate at 2.4 GHZ 
 +
 +in the license free, internationally available ISM radio 
 +
 +Group. The advantage to this group contains global 
 +
 +availability and compatibility [[http://www.handheldgpsnavigatorsite.com/|open in a new browser window]] vv. A problem to 
 +
 +this but, is the fact that the units must share this 
 +
 +band with other RF emitters. This consists of 
 +
 +automobile security systems, other wireless devices, 
 +
 +and other noise sources, such as for example microwaves. 
 +
 +To over come this problem, Bluetooth uses a 
 +
 +fast fre-quency hopping system and thus uses 
 +
 +shorter packages than other standards within the 
 +
 +ISM band. This plan helps to make Bluetooth 
 +
 +Conversation more effective and more secure. 
 +
 +Consistency jumping 
 +
 +Frequency hopping is simply leaping from consistency 
 +
 +to frequency inside the ISM radio band. After having a 
 +
 +bluetooth device sends or receives a packet, it 
 +
 +and the unit (or devices) it's communicating with 
 +
 +Jump to another fre-quency prior to the next box is 
 +
 +sent. This structure gives three advantages: 
 +
 +1. Allows Bluetooth devices to-use the 
 +
 +Whole of the available ISM band, while never 
 +
 +Shifting from a fixed frequency for more than a 
 +
 +Little while of time. It will help guarantee that 
 +
 +Bluetooth conforms to the ISM restrictions on the 
 +
 +transmission sum per frequency. 
 +
 +2. Means that any disturbance won't 
 +
 +last long. Any packet that does not arrive safely 
 +
 +to its destination could be resent to another location 
 +
 +frequency. 
 +
 +3. Provides a base amount of security as 
 +
 +it's very hard for an eavesdropping device to anticipate 
 +
 +which fre-quency the Bluetooth devices will use 
 +
 +next. 
 +
 +The linked products nevertheless, should agree upon the 
 +
 +frequency they'll use next. The specification 
 +
 +in Bluetooth ensures this in two ways. First, it 
 +
 +Becomes a master and servant typ-e relationship between 
 +
 +bluetooth products [[http://www.handheldgpsnavigatorsite.com/my-garmin-60csx-review/|garmin 60csx review]] . Next, it describes a formula 
 +
 +Device specific information is used by that when 
 +
 +Determining the fre-quency jump sequences. 
 +
 +A Bluetooth device that works in master mode may 
 +
 +Keep in touch with up to seven units which are set in 
 +
 +slave mode. To each one of the slaves, the master 
 +
 +Wireless unit may send its own unique address 
 +
 +and the worth of a unique internal clock. The 
 +
 +Data sent is then used to estimate the 
 +
 +Fre-quency hop sequences. 
 +
 +Because each one of the slave and the master device 
 +
 +Units utilize the same protocol with the same original 
 +
 +input, the connected devices will always appear 
 +
 +together in the frequency that they have agreed 
 +
 +upon. 
 +
 +As a replacement for wire technology, it is no 
 +
 +wonder that Bluetooth devices usually are battery 
 +
 +powered, such as instant mice and battery powered 
 +
 +Cellular phones. To conserve the ability, most products 
 +
 +Function in low power. This helps to give Bluetooth 
 +
 +devices a selection of around 5 - 10 meters. 
 +
 +This variety is far enough for instant transmission 
 +
 +but close enough to prevent drawing a lot of energy 
 +
 +In the power supply of the unit.
how_smartphones_connect_using_bluetooth.txt · Dernière modification: 2013/06/05 04:24 par treva177