What Is 802.11A; What Is 802.11G; What Is 802.11N; Is It Possible To Use Products From A Variety Of Vendors - ZyXEL Communications P-2812HNU-51c Support Notes

Dual wan vdsl2 iad with 802.11n wireless

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P-2812HNU-51C Support Notes

and DSL modems).

What is 802.11a?

802.11a the second revision of 802.11 that operates in the unlicensed 5 GHz band

and allows transmission rates of up to 54Mbps. 802.11a uses OFDM (orthogonal

frequency division multiplexing) as opposed to FHSS or DSSS. Higher data rates are

possible by combining channels. Due to higher frequency, range is less than lower

frequency systems (i.e., 802.11b and 802.11g) and can increase the cost of the

overall solution because a greater number of access points may be required. 802.11a

is not directly compatible with 802.11b or 802.11g networks. In other words, a user

equipped with an 802.11b or 802.11g radio card will not be able to interface directly

to an 802.11a access point. Multi-mode NICs will solve this problem.

802.11g is an extension to 802.11b. 802.11g increases 802.11b's data rates to 54

Mbps and still utilise the the 2.4 GHz ISM. Modulation is based upon OFDM

(orthogonal frequency division multiplexing) technology. An 802.11b radio card will

interface directly with an 802.11g access point (and vice versa) at 11 Mbps or lower

depending on range. The range at 54 Mbps is less than for 802.11b operating at 11

Mbps.

802.11n supports frequency in both 2.4GHz and 5 GHz and its data rate from 54

Mbit/s up to 600 Mbit/s in theory; in the 802.11n Channel Doubling technology witch

can double the bandwidth from 20 MHz to 40 MHz and effectively doubles data rates

and throughput. It adds MIMO feature, which using multiple transmission and

reception antennas to allow higher raw rate, and resolve more information using a

single antenna possibility. It also uses the "Alamouti coding" coding schemes to

increase transmission range.

Yes. As long as the products comply to the same IEEE 802.11 standard. The Wi-Fi logo

is used to define 802.11b compatible products. Wi-Fi5 is a compatibility standard for

802.11a products running in the 5GHz band.

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