TELECOMMUNICATIONS SYSTEMS
COMMUNICATION WIRELESS COMPUTING DEVICES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Bluetooth
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802.11b
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802.11a
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Infrared
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Detailed explanation-1: -In practice, 802.11b typically has a higher range at low speeds (802.11b will reduce speed to 5.5 Mbit/s or even 1 Mbit/s at low signal strengths). 802.11a also suffers from interference, but locally there may be fewer signals to interfere with, resulting in less interference and better throughput.
Detailed explanation-2: -Also called Wi-Fi, 802.11b operates at 2.4 GHz with a maximum transmission rate of 11M bit/sec. at the access point (AP). Meanwhile, 802.11a operates on the less-crowded 5-GHz band and runs at up to 54M bit/sec.
Detailed explanation-3: -802.11b and 802.11g both work under the 2.4GHz frequency range. This means that they are inter-operable with each other. All 802.11g devices can communicate with 802.11b devices. The advantage of 802.11g is that you will be able to transfer files between computers or networks at much faster speeds.
Detailed explanation-4: -Frequency Ranges of the 802.11 network-types: 802.11n: 2.4GHz & 5GHz bands: 802.11n equipment is made for either 2.4GHz or 5.8 frequency band: 5.8 is typically much less cluttered with signal-traffic. 802.11a: 5GHz band. 802.11b and 802.11g: 2.4GHz only: Operate only in the 2.4GHz frequency band.