COTN1220_05_Wireless LANs PDF
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Universidad Interamericana de Puerto Rico
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Summary
This document provides a summary of different 802.11 wireless standards, including their frequencies, throughput, and range. It also details some potential pitfalls in using wireless networks such as access point/client configuration issues and SSID mismatches.
Full Transcript
802.11b 2.4-GHz band Separated into 22-MHz channels Throughput 11-Mbps theoretical 5-Mbps actual 100 meters node limit Oldest, least expensive Replaced by 802.11g 802.11a Released after 802.11b 5-GHz band Not congested like 2.4-GHz band Lower interference, requires...
802.11b 2.4-GHz band Separated into 22-MHz channels Throughput 11-Mbps theoretical 5-Mbps actual 100 meters node limit Oldest, least expensive Replaced by 802.11g 802.11a Released after 802.11b 5-GHz band Not congested like 2.4-GHz band Lower interference, requires more transmit power (wireless telephones, microwaves) Throughput 54 Mbps theoretical 11 and 18 Mbps effective Attributable to higher frequencies, unique modulating data method, more available bandwidth 20-meter node limit More expensive, least popular (Compared to 802.11b) 802.11g Affordable as 802.11b Throughput 54 Mbps theoretical 20 to 25 Mbps effective 100-meter node range 2.4-GHz frequency band Compatible with 802.11b networks 802.11n Primary goal Wireless standard providing much higher effective throughput Maximum throughput: 600 Mbps Multiple-Input and Multiple-Output (MIMO) technology – utilization of multiple wireless signals and antennas 400-meter node range* 802.11n (cont.) 2.4-GHz or 5-GHz frequency range Backward compatible Not all 802.11n features work 802.11ac 2.4 & 5-GHz bands Dual band wireless technology Capability to transmit on the 5 GHz band of 802.11a and also the 2.4 GHz band used by 802.11b, 802.11g, and 802.11n. Throughput 1300-Mbps (5-GHz) theoretical 450-Mbps (2.4-GHz) theoretical 802.11ax Between 1 GHz and 6 GHz 3.5 Gbps per data stream (MIMO capable) Capacity for 4x more devices Reduce power consumption Target Wake Time (TWT) allows devices to negotiate when and how often they will wake up to send or receive data BSS Color, marks frames from neighboring networks so that your router can ignore them. Wireless Summary Standard Frequency Theoretical Range Maximum Throughput 802.11b 2.4 GHz 11-Mbps 46m 802.11a 5 GHz 54-Mbps 20m 802.11g 2.4 GHz 54-Mbps 46m 802.11n 2.4 GHz or 5 GHz 65-Mbps 600-Mbps (MIMO) 46m 802.11ac 5 GHz 1.3-Gbps 70m 802.11ax 2.4 GHz or 5 GHz 3.5 Gbps TBD 14 Gbps (MIMO) Avoiding Pitfalls Access point versus client configurations SSID mismatch Incorrect encryption Incorrect channel, frequency Standard mismatch (802.11 a/b/g/n/ac) Incorrect antenna placement Verify client within 330 feet* Interference Check for EMI sources Avoiding Pitfalls
