User's Manual

Suga Electronics Limited
Page 18 of 19
Appendix B: Glossary
* 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.
* 802.11g - 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.
* 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 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).
* 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.
* SSID - A Service Set Identification is a thirty-two character (maximum)
alphanumeric key identifying a wireless local area network. For the wireless devices
in a network to communicate with each other, all devices must be configured with the
same SSID. This is typically the configuration parameter for a wireless LAN card for
an embedded system. It corresponds to the ESSID in the wireless Access Point and to
the wireless network name.
* WEP (Wired Equivalent Privacy) - A data privacy mechanism based on a 64-bit or
128-bit or 152-bit shared key algorithm, as described in the IEEE 802.11 standard.
* Wi-Fi - A trade name for the 802.11b wireless networking standard, given by the