Cable Company 10/100/1000 Express PCMCIA Card TCARDEXP015LC Manual Do Utilizador

Códigos do produto

TCARDEXP015LC

INTERNET

Indoor

Outdoor

INFRASTRuCTuRE AND AD HOC MODES

An 802.11 system works in two modes. In "infrastructure" mode, wireless

devices communicate to a wired LAN via Base stations known as "access

points." Each access point and its wireless devices are known as a Basic

Service Set (BSS). An Extended Service Set (ESS) is two or more BSSs in the

same subnet.
In "ad hoc" mode, also known as "peer-to-peer" mode, wireless devices

communicate with each other directly without an access point. This is an

Independent BSS (IBSS).

THROuGHPuT VARIES

The speed of 802.11 systems is distance dependent. The farther away the

remote device from the Base station, the lower the speed.
Also, the actual data throughput is generally no more than half of the rated

speed because 802.11 uses a collision "avoidance" technology (CSMA/CA)

rather than the collision "detection" method (CSMA/CD) in wired Ethernet. Wired

systems can detect a collision, but wireless cannot, thus, the CSMA/CA method

waits for an acknowledgment from the other end to determine if the packet was

transmitted properly. A 54Mbps rated speed yields only about 27 Mbps in real

throughput.

MIMO (multiple input, multiple output) is an antenna

technology for wireless communications in which

multiple antennas are used at both the source

(transmitter) and the destination (receiver). The

antennas at each end of the communications circuit

are combined to minimize errors and optimize

data speed. MIMO is one of several forms of smart

antenna technology

108Mbps Super G® and Super AG®

employ smart Adaptive Radio Technology

that automatically detects application

requirements and network conditions, and

responds to provide users with the highest

actual throughput for each usage situation.

WIRElESS -- Radio transmission through the air. Wireless is a very generic term that refers to numerous forms

of transmission that do not use metal wires or optical fibers. The two most common types of wireless capabilities

computers are Wi-Fi and Bluetooth.
Wi-Fi connect your computer, PDA or other devices to each other and provide secure, reliable, fast wireless

connectivity. A Wi-Fi network can be used to connect computers to each other, to the Internet and to wired networks

(which use IEEE 802.3 or Ethernet)
Of course, you need a Wi-Fi radio in your computing device. This can be a wireless Adapter, PCI Card, an

embedded Wi-Fi USB key or a PCMCIA Card in your laptop computer or PDA.

Elementary Concepts on WIRELESS

MIM

t e c h n o l o g y

802.11 and 802.11x refers to a FAMIly OF SPECIFICATIONS

developed by the IEEE for Wireless lAN technology.

802.11

specifies an over-the-air interface between a wireless client and a

Base station or between two wireless clients
802.11 -- 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 -- provides up to 54Mbps in the 5GHz band. 802.11a uses

an orthogonal FDM (OFDM) transmission method, two higher-speed

standards followed 802.11b.
802.11b (also referred to as 802.11 High Rate or Wi-Fi standard)

-- provides 11Mbps transmission in the 2.4 GHz band. 802.11b uses

only DSSS.
802.11g -- provides 54Mbps in the same 2.4 GHz band. Compatible

with 802.11b. (If 11b and 11g devices are communicating, it is done at

the slower 802.11b speed.)
802.11n -- is intended to increase network speed and reliability and

to extend the operating distance of wireless networks. Raw data

throughput is expected to reach as much as 600Mbps, or more than

10 times the throughput of 802.11g.

TP-lINK EXtended Range™ WlAN allows

users to enjoy reliable, broader signal

coverage, usually 2-3 times further than

traditional 11b/g products, and stronger signal

penetration making it much more efficient at

reaching hard to reach areas such as through

walls and floors.
Wireless Range : Indoors up to 200m,

Outdoors up to 830m.

elemenTaRY concepTs

/ Wireless lan

Giving Ethernet-enabled devices wireless connection capabilities.

The 802.11g Wireless Client Adapter allows your laptop, desktop, stereo,

printer, projector, game console, workstation, audio or other consumer

electronics to connect wirelessly to the internet through their Ethernet

port.

128bit WEP, WPA and WPA2 Encryption

▪

wireless smart Ethernet client adapter - 54Mbps

reference

description

Wireless Smart Ethernet Client Adapter, 54Mbps

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