Asus WL-320gE User Manual download pdf (Page 51)

5. Appendix

ASUS 802.11g Access Point 51

Chapter 5 - Appendix

Glossary

Access Point (AP)

An networking device that seamlessly connects wired and wireless networks.

Access Points combined with a distributed system support the creation of multiple

radio cells that enable roaming throughout a facility.

Ad Hoc

A wireless network composed solely of stations within mutual communication

range of each other (no Access Point).

AES(Advance Encryption Standard)

AES is the U.S. government’s next-generation cryptography algorithm, which will

replace DES and 3DES. This encryption key protocol is applied in 802.1i standard

to improve WLAN security. AES will require new hardware, in contrast with TKIP

that can be used on existing wireless devices.

Basic Service Area (BSS)

A set of stations controlled by a single coordination function.

Broadband

A type of data transmission in which a single medium (such as cable) carries

several channels of data at once.

Channel

An instance of medium use for the purpose of passing protocol data units that

may be used simultaneously, in the same volume of space, with other instances

of medium use (on other channels) by other instances of the same physical layer,

with an acceptably low frame error ratio due to mutual interference.

Client

A client is the desktop or mobile PC that is connected to your network.

COFDM (for 802.11a or 802.11g)

Signal power alone is not enough to maintain 802.11b-like distances in an

802.11a/g environment. To compensate, a new physical-layer encoding technology

was designed that departs from the traditional direct-sequence technology being

deployed today. This technology is called COFDM (coded OFDM). COFDM was

developed specically for indoor wireless use and offers performance much

superior to that of spread-spectrum solutions. COFDM works by breaking one

high-speed data carrier into several lower-speed subcarriers, which are then

transmitted in parallel. Each high-speed carrier is 20 MHz wide and is broken

up into 52 subchannels, each approximately 300 KHz wide. COFDM uses 48 of

these subchannels for data, while the remaining four are used for error correction.

COFDM delivers higher data rates and a high degree of multipath reection

recovery, thanks to its encoding scheme and error correction.

Each subchannel in the COFDM implementation is about 300 KHz wide. At the low

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Asus WL-320gE User Manual Page 51