P-873HNUP-51B Support Notes
All contents copyright (c) 2011 ZyXEL Communications Corporation.
How fast is 802.11b?
The IEEE 802.11b standard has a nominal speed of 11 megabits per second (Mbps).
However, depending on signal quality and how many other people are using the
wireless ethernet through a particular Access Point, usable speed will be much less
(on the order of 4 or 5 Mbps, which is still substantially faster than most dialup, cable
and DSL modems).
What is 802.11g?
802.11g is an extension to 802.11b. 802.11g increases 802.11b's data rates to 54
Mbps and still utilize 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.
What is 802.11n?
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.
Is it possible to use products from a variety of vendors?
Yes. As long as the products comply with 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.
