Digisol DG-WN3430AC Manuale d'uso - Pagina 19

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3.3 Glossary

IEEE 802.11g standard: 802.11g is the new IEEE standard for high-speed wireless

LAN communications that provides for up to 54 Mbps data rate in the 2.4 GHz band.

802.11g is quickly becoming the next mainstream wireless LAN technology for

home, office and public networks.

802.11g defines the use of the same OFDM modulation technique specified in IEEE

802.11a for the 5 GHz frequency band and applies it in the same 2.4 GHz frequency

band as IEEE 802.11b. The 802.11g standard requires backward compatibility with

802.11b.

The standard specifically calls for:

A. A new physical layer for the 802.11 Medium Access Control (MAC) in the

2.4 GHz frequency band, known as the extended rate PHY (ERP). The ERP

adds OFDM as a mandatory new coding scheme for 6, 12 and 24 Mbps

(mandatory speeds) and 18, 36, 48 and 54 Mbps (optional speeds). The ERP

includes the modulation schemes found in 802.11b including CCK for 11 and

5.5 Mbps and Barker code modulation for 2 and 1 Mbps.

B. A protection mechanism called RTS/CTS that governs how 802.11g devices

and 802.11b devices interoperate.

IEEE 802.11b standard: The IEEE 802.11b Wireless LAN standard subcommittee,

which formulates the standard for the industry. The objective is to enable wireless

LAN hardware from different manufactures to communicate.

IEEE 802.11n standard: 802.11n is a wireless networking standard that uses

multiple antennas to increase data rates. It is an amendment to the IEEE 802.11-2007

wireless networking standard. Its purpose is to improve network throughput over the

two previous standards 802.11a and 802.11g with a significant increase in the

maximum net data rate from 54 Mbit/s to 600 Mbit/s.

IEEE 802.11ac standard: 802.11ac is a wireless computer networking standard in

the 802.11 family, developed in the IEEE Standards Association process, providing

high-throughput wireless local area networks (WLANs) on the 5 GHz band.

Ad-hoc: An Ad-hoc integrated wireless LAN is a group of computers, each has a

Wireless LAN card, connected as an independent wireless LAN. Ad hoc wireless

LAN is applicable at a departmental scale for a branch or SOHO operation.

Infrastructure: An integrated wireless and wired LAN is called an Infrastructure

configuration. Infrastructure is applicable to enterprise scale for wireless access to

central database, or wireless application for mobile workers.

DG-WN3430AC User Manual