The Sunshine Health Corporation would like you to provide an updated explanation

Question

The Sunshine Health Corporation would like you to provide an updated explanation and reference guide on 802.11 standards and specifications. Briefly explain the advantages and disadvantages of each. If you locate such a guide online, please make sure you give credit where credit is due.

Please provide a practical application on one of the 802.11 standards (a, b...) in use and how it is used including limitations if any. Critique or defend the use of the application as an in-house and outsourced solution. Include recommendations for future improvements.

Explanation / Answer

The 802.11 standard is defined through several specifications of WLANs. It defines an over-the-air interface between a wireless client and a base station or between two wireless clients.

802.11 This pertains to wireless LANs and provides 1 - or 2-Mbps transmission in the 2.4-GHz band using either frequency-hopping spread spectrum (FHSS) or direct-sequence spread spectrum (DSSS).

802.11a This is an extension to 802.11 that pertains to wireless LANs and goes as fast as 54 Mbps in the 5-GHz band. 802.11a employs the orthogonal frequency division multiplexing (OFDM) encoding scheme as opposed to either FHSS or DSSS.

802.11b The 802.11 high rate WiFi is an extension to 802.11 that pertains to wireless LANs and yields a connection as fast as 11 Mbps transmission (with a fallback to 5.5, 2, and 1 Mbps depending on strength of signal) in the 2.4-GHz band. The 802.11b specification uses only DSSS. Note that 802.11b was actually an amendment to the original 802.11 standard added in 1999 to permit wireless functionality to be analogous to hard-wired Ethernet connections.

802.11g This pertains to wireless LANs and provides 20+ Mbps in the 2.4-GHz band

Here is the technical comparison between the three major WiFi standards.

2.4 GHz ISM (g)

5 GHz U-NII (a)

Direct Sequence

Spread Spectrum

OFDM

(64-channels)

CSMA/CA

Feature WiFi (802.11b) WiFi (802.11a/g) PrimaryApplication Wireless LAN Wireless LAN Frequency Band 2.4 GHz ISM

2.4 GHz ISM (g)

5 GHz U-NII (a)

Channel Bandwidth 25 MHz 20 MHz Half/Full Duplex Half Half Radio Technology

Direct Sequence

Spread Spectrum

OFDM

(64-channels)

Bandwidth <=0.44 bps/Hz =2.7 bps/Hz Efficiency Modulation QPSK BPSK, QPSK, 16-, 64-QAM FEC None Convolutional Code Encryption Optional- RC4m (AES in 802.11i) Optional- RC4(AES in 802.11i) Mobility In development In development Mesh Vendor Proprietary Vendor Proprietary Access Protocol CSMA/CA

CSMA/CA

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.