Rev. 1 - YML669
www.netcomm.com.au
NP5430 11g Wireless PC Card User Guide
Page 21
OFDM
Developed for wireless applications, Orthogonal Frequency
Division Multiplexing (OFDM) technology offers superior
performance-increased data rates and more reliable
transmissions-than previous technologies, such as DSSS. OFDM
is a scheme in which numerous signals of different frequencies
are combined to form a single signal for transmission on the
medium. OFDM works by breaking one high-speed data stream
into a number of lower-speed data streams, which are then
transmitted in parallel. Each lower speed stream is used to
modulate a subcarrier. Essentially, this creates a multi-carrier
transmission by dividing a wide frequency band or channel into a
number of narrower frequency bands or sub-channels. OFDM is
also used for other applications, including powerline networking.
Plug-and-Play
The ability of a computer system to configure expansion boards
and other devices automatically without requiring the user to
turn off the system during installation.
Roaming
In an infrastructure mode wireless network, this refers to the
ability to move out of one access point's range and into another
and transparently reassociate and reauthenticate to the new
access point. This reassociation and reauthentication should
occur without user intervention and ideally without interruption
to network connectivity. A typical scenario would be a location
with multiple access points, where users can physically relocate
from one area to another and easily maintain connectivity.
SSID
(Service Set Identifier) - An identification name that wireless
devices use to make connections. In order for wireless devices to
communicate, they must all be set to the same channel and they
all must use the same SSID. For instance, if you are using an
access point to connect two computers using wireless devices,
the access point and each of the wireless devices must use the
same SSID. Even if they are set to the same channel, they cannot
communicate unless the SSID is the same.
Static IP Address
A permanent IP address that is assigned to a node in a TCP/IP
network.
Subnet Mask
The method used for splitting IP networks into a series of
subgroups, or subnets. The mask is a binary pattern that is
matched up with the IP address to turn part of the host ID
address field into a field for subnets.
