Asus WL-320gE - Manual (Page 57)

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Appendix
ASUS 802.11g Access Point 7
Chapter - Appendix
Direct-sequence is a spread spectrum technique where the transmitted signal
is spread over a particular frequency range.
Direct-sequence systems communicate by continuously transmitting a
redundant pattern of bits called a chipping sequence. Each bit of transmitted
data is mapped into chips and rearranged into a pseudorandom spreading
code to form the chipping sequence. The chipping sequence is combined
with a transmitted data stream to produce the output signal.
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