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Archer T4U

AC1200 Wireless Dual Band USB Adapter User Guide

Appendix B: Glossary

 802.11ac - IEEE 802.11ac is a wireless computer networking standard of 802.11.This

specification will enable multi-station WLAN throughput of at least 1 gigabit per

second .This is accomplished by extending the air interface concepts embraced by

802.11n: wider RF bandwidth, more MIMO spatial streams, multi-user MIMO, and

high-density modulation (up to 256 QAM).

 802.11n - 802.11n builds upon previous 802.11 standards by adding MIMO (multiple-input

multiple-output). MIMO uses multiple transmitter and receiver antennas to allow for increased

data throughput via spatial multiplexing and increased range by exploiting the spatial diversity,

perhaps through coding schemes like Alamouti coding. The Enhanced Wireless Consortium

(EWC) was formed to help accelerate the IEEE 802.11n development process and promote a

technology specification for interoperability of next-generation wireless local area networking

(WLAN) products.

 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.

 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.

 802.11a - specification for wireless networking at 54 Mbps using OFDM modulation and

operating in radio band at 5GHz.

 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.

 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).

 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.

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