User's Manual

TL-WN620G 108M Wireless USB Adapter User Guide
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Appendix B: Glossary
¾ 108M Super G
TM
WLAN Transmission Technology - 108M Super G
TM
WLAN
Transmission Technology employs multiple performance-enhancing techniques
including packet bursting, fast frames, data compression, and dynamic turbo mode
that combine to improve the throughput and range of wireless networking products.
Users can experience link rates of up to 108Mbps, twice the industry-standard
maximum data link rate of 54Mbps, while preserving full compatibility with traditional
802.11g or 802.11b networks. 108M Super G
TM
products offer the highest throughput
performance available on the market today. In dynamic 108M mode, the device can
attach 802.11b, 802.11g and 108Mbps Super G
TM
devices at the same time in an
integrated environment.
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 for
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