IBM 802.11g Wireless Broadband Router WRT-410 - Manual (Page 64)

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This new products use the ACX100 chip from Texas Instruments. In addition to meeting the existing
standard, the chip also supports a new modulation scheme developed by TI, called Packet Binary
Convolution Code (PBCC). It's this scheme that gives the products the extra kick: Even at lower
speeds, PBCC provides better performance at greater distances, and it can also work at 22 Mbps.
What is Ad-hoc?
An Ad-hoc integrated wireless LAN is a group of computers, each with a WLAN adapter, connected
as an independent wireless LAN. Ad hoc wireless LAN is applicable at a departmental scale for a
branch or SOHO operation.
What is 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.
What is Roaming?
Roaming is the ability of a portable computer user to communicate continuously while moving
freely throughout an area greater than that covered by a single Wireless Network Access Point.
Before using the roaming function, the workstation must make sure that it is the same channel
number with the Wireless Network Access Point of dedicated coverage area.
5.2 Glossary
ACCESS POINT
Access points are way stations in a wireless LAN that are connected to an Ethernet hub or server. Users
can roam within the range of access points and their wireless device connections are passed from one
access point to the next.
AUTHENTICATION
Authentication refers to the verification of a transmitted message's integrity.
DMZ
DMZ (DeMilitarized Zone) is a part of an network that is located between a secure LAN and an insecure
WAN. DMZs provide a way for some clients to have unrestricted access to the Internet.
BEACON INTERVAL
Refers to the interval between packets sent sent by access points for the purposes of synchronizing
wireless LANs.
DHCP
DHCP (Dynamic Host Configuration Protocol) software automatically assigns IP addresses to client
stations logging onto a TCP/IP network, which eliminates the need to manually assign permanent IP
addresses.