Asus WL-103g User Manual page 64

Chapter 5 - Glossary
Wireless mobile clients receiving a direct-sequence transmission use the
spreading code to map the chips within the chipping sequence back into bits to
recreate the original data transmitted by the wireless device. Intercepting and
decoding a direct-sequence transmission requires a predefined algorithm to
associate the spreading code used by the transmitting wireless device to the
receiving wireless mobile client.
This algorithm is established by IEEE 802.11b specifications. The bit
redundancy within the chipping sequence enables the receiving wireless mobile
client to recreate the original data pattern, even if bits in the chipping sequence
are corrupted by interference. The ratio of chips per bit is called the spreading
ratio. A high spreading ratio increases the resistance of the signal to interference.
A low spreading ratio increases the bandwidth available to the user. The wireless
device uses a constant chip rate of 11Mchips/s for all data rates, but uses different
modulation schemes to encode more bits per chip at the higher data rates. The
wireless device is capable of an 11 Mbps data transmission rate, but the coverage
area is less than a 1 or 2 Mbps wireless device since coverage area decreases as
bandwidth increases.
Encryption
This provides wireless data transmissions with a level of security.
Extended Service Set (ESS)
A set of one or more interconnected basic service set (BSSs) and integrated
local area networks (LANs) can be configured as an Extended Service Set.
ESSID (Extended Service Set Identifier)
You must have the same ESSID entered into the gateway and each of its wireless
clients. The ESSID is a unique identifier for your wireless network.
Ethernet
The most widely used LAN access method, which is defined by the IEEE
802.3 standard. Ethernet is normally a shared media LAN meaning all devices
on the network segment share total bandwidth. Ethernet networks operate at
10Mbps using CSMA/CD to run over 10-BaseT cables.
Firewall
A firewall determines which information passes in and out of a network. NAT
can create a natural firewall by hiding a local network's IP addresses from the
Internet. A Firewall prevents anyone outside of your network from accessing
your computer and possibly damaging or viewing your files.
Gateway
A network point that manages all the data traffic of your network, as well as to
the Internet and connects one network to another.
64 ASUS WLAN Card