Asus USB-N14 User Manual

11
COFDM (for 802.11a or 802.11g)
Signal power alone is not enough to maintain 802.11b-like distances in an
802.11a/g environment. To compensate, a new physical-layer encoding
technology was designed that departs from the traditional direct-sequence
technology being deployed today. This technology is called COFDM (coded
OFDM). COFDM was developed specically for indoor wireless use and oers
performance much superior to that of spread-spectrum solutions. COFDM
works by breaking one high-speed data carrier into several lowerspeed
subcarriers, which are then transmitted in parallel. Each high-speed carrier is
20MHzwideandisbrokenupinto52subchannels,eachapproximately300KHz
wide. COFDM uses 48 of these subchannels for data, while the remaining four
are used for error correction. COFDM delivers higher data rates and a high
degree of multipath reection recovery, thanks to its encoding scheme and
error correction.
EachsubchannelintheCOFDMimplementationisabout300KHzwide.At
thelowendofthespeedgradient,BPSK(binaryphaseshiftkeying)isused
toencode125Kbpsofdataperchannel,resultingina6,000Kbps,or6Mbps,
data rate. Using quadrature phase shift keying, you can double the amount of
dataencodedto250Kbpsperchannel,yieldinga12Mbpsdatarate.Andby
using16-levelquadratureamplitudemodulationencoding4bitsperhertz,
you can achieve a data rate of 24Mbps. The 802.11a/g standard species
that all 802.11a/g-compliant products must support these basic data rates.
The standard also lets the vendor extend the modulation scheme beyond
24Mbps. Remember, the more bits per cycle (hertz) that are encoded, the more
susceptible the signal will be to interference and fading, and ultimately, the
shorter the range, unless power output is increased.
Default Key
This option allows you to select the default WEP key. This option allows you to
use WEP keys without having to remember or write them down. The WEP keys
generated using the Pass Phrase is compatible with other WLAN products. The
Pass Phrase option is not as secure as manual assignment.
Device Name
Also known as DHCP client ID or network name. Sometimes provided by an ISP
when using DHCP to assign addresses.
DHCP (Dynamic Host Conguration Protocol)
This protocol allows a computer (or many computers on your network) to be
automatically assigned a single IP address from a DHCP server.

Asus USB-N14 Specifications

General

Interface	WLAN
USB ports quantity	1
Connectivity technology	Wireless
Chipset	-
Internal	No
Component for	PC/Laptop
Product color	Black
Antenna connector type	R-SMA
Modulation	16-QAM, 64-QAM, CCK, OFDM
Wi-Fi standards	802.11b, 802.11g, Wi-Fi 4 (802.11n)
Top Wi-Fi standard	Wi-Fi 4 (802.11n)
Security algorithms	128-bit WEP, 64-bit WEP, WPA-PSK, WPA2-PSK, WPS
Networking standards	IEEE 802.11b, IEEE 802.11g, IEEE 802.11n
Maximum data transfer rate	300 Mbit/s
Gain	5 dBi
Mac operating systems supported	Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks
Windows operating systems supported	Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, Windows 7 Ultimate x64, Windows 8, Windows 8 Enterprise, Windows 8 Enterprise x64, Windows 8 Pro, Windows 8 Pro x64, Windows 8 x64, Windows XP Home, Windows XP Home x64, Windows XP Professional, Windows XP Professional x64

Weight and Dimensions

Depth	90 mm
Width	55 mm
Height	11 mm