Tp-Link TL-WN721N [46/47] Appendix b glossary

TL-WN721N 150Mbps Wireless N USB Adapter

Appendix B: Glossary

¾ 802.11b - The 802.11b standard specifies a wireless product networking at 11 Mbps using

direct-sequence spread-spectrum (DSSS) technology and operating in the unlicensed radio

spectrum at 2.4GHz, and WEP encryption for security. 802.11b networks are also referred to

as Wi-Fi networks.

¾ 802.11g - specification for wireless networking at 54 Mbps using direct-sequence

spread-spectrum (DSSS) technology, using OFDM modulation and operating in the

unlicensed radio spectrum at 2.4GHz, and backward compatibility with IEEE 802.11b devices,

and WEP encryption for security.

¾ Ad-hoc Network - An ad-hoc network is a group of computers, each with a Wireless Adapter,

connected as an independent 802.11 wireless LAN. Ad-hoc wireless computers operate on a

peer-to-peer basis, communicating directly with each other without the use of an access point.

Ad-hoc mode is also referred to as an Independent Basic Service Set (IBSS) or as

peer-to-peer mode, and is useful at a departmental scale or SOHO operation.

¾ DSSS - (Direct-Sequence Spread Spectrum) - DSSS generates a redundant bit pattern for all

data transmitted. This bit pattern is called a chip (or chipping code). Even if one or more bits

in the chip are damaged during transmission, statistical techniques embedded in the receiver

can recover the original data without the need of retransmission. To an unintended receiver,

DSSS appears as low power wideband noise and is rejected (ignored) by most narrowband

receivers. However, to an intended receiver (i.e. another wireless LAN endpoint), the DSSS

signal is recognized as the only valid signal, and interference is inherently rejected (ignored).

¾ FHSS - (Frequency Hopping Spread Spectrum) - FHSS continuously changes (hops) the

carrier frequency of a conventional carrier several times per second according to a

pseudo-random set of channels. Because a fixed frequency is not used, and only the

transmitter and receiver know the hop patterns, interception of FHSS is extremely difficult.

¾ Infrastructure Network - An infrastructure network is a group of computers or other devices,

each with a Wireless Adapter, connected as an 802.11 wireless LAN. In infrastructure mode,

the wireless devices communicate with each other and to a wired network by first going

through an access point. An infrastructure wireless network connected to a wired network is

referred to as a Basic Service Set (BSS). A set of two or more BSS in a single network is

referred to as an Extended Service Set (ESS). Infrastructure mode is useful at a corporation

scale, or when it is necessary to connect the wired and wireless networks.

¾ Spread Spectrum - Spread Spectrum technology is a wideband radio frequency technique

developed by the military for use in reliable, secure, mission-critical communications systems.

It is designed to trade off bandwidth efficiency for reliability, integrity, and security. In other

words, more bandwidth is consumed than in the case of narrowband transmission, but the

trade off produces a signal that is, in effect, louder and thus easier to detect, provided that the

receiver knows the parameters of the spread-spectrum signal being broadcast. If a receiver is

not tuned to the right frequency, a spread-spectrum signal looks like background noise.

There are two main alternatives, Direct Sequence Spread Spectrum (DSSS) and Frequency

Hopping Spread Spectrum (FHSS).