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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.
IEEE
The Institute of Electrical and Electronics Engineers. The IEEE sets standards for
networking, including Ethernet LANs. IEEE standards ensure interoperability between
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ASUS WLAN Card
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