A+ Essentials Tutorial

2.0 Laptop and Portable Devices

2.1 Identify the fundamental principles of using laptops and portable devices

  • Communication connections (e.g. Bluetooth, infrared, cellular WAN, Ethernet)

Bluetooth: Bluetooth is an alternative wireless network technology that followed a different development path than the 802.11 family of standards. Its bandwidth is up to 2.1Mbps for version 2.0, and its range is only 10 meters (30 feet). Devices with a Bluetooth radio and an antenna can speak to each other with little or no preparation. For example, conference attendees can readily transfer files across a table using their Bluetooth-enabled notebooks. You can also send a file to a Bluetooth-enabled printer without downloading drivers. Bluetooth may soon be a standard interface on many cell phones, handheld computers, and even home appliances. However, it is going to take sometime before the hardware and software issues are resolved completely. Bluetooth operates at 2.4GHz.

Infrared: Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of microwave radiation. It is a line of sight communication, and any obstruction to line of sight is going to disrupt communication.

Cellular WAN: A Cellular WAN provides wireless connectivity over long distances using cellular towers. Cellular WAN provides communication for distances as long as 10 KM.

Eithernet: Ethernet is a consist of diverse family of computer networking technologies that operates over local area networks (LANs). It defines a number of wiring and signaling standards for the physical layer, and network access at the Media Access Control (MAC)/Data Link Layer, and a common addressing format. Ethernet has been standardized as IEEE 802.3.

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