What Is a Bluetooth® Modem?

Bluetooth is a radio technology that supports short-range communication of devices (usually within 10m). Wireless information can be exchanged between many devices including mobile phones, PDAs, wireless headsets, laptops, related peripherals, and more. The standard of Bluetooth is IEEE802.15, which works in the 2.4GHz band and has a bandwidth of 1Mb / s.

Bluetooth function

Bluetooth is a radio technology that supports short-range communication of devices (usually within 10m). Can include mobile phones, PDAs,

The founder of Bluetooth is

Bluetooth is made up of

Support voice and data transmission; use radio technology, large transmission range, can penetrate different materials and spread between materials; use frequency hopping and spread spectrum technology, strong anti-interference, not easy to eavesdrop; use unrestricted spectrum in all countries, In theory, there is no interference problem; low power consumption; low cost. Disadvantages of Bluetooth: Slow transmission speed. Bluetooth technical performance parameters: the effective transmission distance is 10cm ~ 10m, increasing the transmission power can reach 100 meters, or even longer. The working frequency of the transceiver is 2.45GHz, and the coverage range is 79 channels (from 2.402GHz to 2.480GHz) separated by 1MHz. The data transmission technology uses short packets, frequency hopping and spread spectrum technology, 1600 times / second, to prevent eavesdropping and interference; each time a packet is transmitted, the size of the packet is from 126 to 287 bits; the content of the packet can include data or voice, etc Service information. The data transmission bandwidth is 32.6Kbps in each direction, which is close to 10 times the typical 56kb / s Modem analog connection rate. The asynchronous connection allows the data transmission rate in one direction to reach 721kb / s for uploading or downloading. The rate in the opposite direction is 57.6kb / s; the data transmission channel is reserved for 3 concurrent synchronous voice channels, each with a bandwidth of 64kb / s; voice and data can also be mixed in one channel to provide a 64kb / s synchronous voice Connection and an asynchronous data connection. The network connection uses encryption technology and password authentication to connect the devices. It can form a Bluetooth micronet (Piconet) with 7 other devices at the same time. A Bluetooth device can join 8 different micronets at the same time. Each micronet has 1Mb / s transmission bandwidth. When two or more devices share a channel, a Bluetooth micronet can be formed, and one of the devices can control the transmission volume. When the device has not joined the Bluetooth micronet, it enters standby first. status.

Wireless communication between mobile phones and hands-free devices, which was also the first popular application

Wireless network between computers within a certain distance

Wireless connection between computer and peripherals, such as: mouse, headset, printer, etc.

File transfer between Bluetooth devices

Wireless of traditional wired devices, such as: medical equipment, GPS, barcode scanners, traffic management equipment

Wireless bridge between several Ethernet

7th generation game console handle, PS3, PSP go, Nitendo Wii ipega9017 ipega9017S Ipega9025 Bluetooth gamepad

Rely on Bluetooth support to enable a PC or PDA to dial-up to the Internet through the phone's modem

Real-time positioning system (RTLS), which uses "nodes" or "tags" embedded in tracked items. "Card readers" receive and process wireless signals from tags to determine the position of the item