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Chapter 5 - appendix, Device name, Dhcp (dynamic host configuration protocol) – Asus WL-320gE User Manual

Page 52: Dns server address (domain name system), Dsl modem (digital subscriber line)

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5.

Appendix

52

ASUS 802.11g Access Point

Chapter 5 - Appendix

end of the speed gradient, BPSK (binary phase shift keying) is used to encode 125

Kbps of data per channel, resulting in a 6,000-Kbps, or 6 Mbps, data rate. Using

quadrature phase shift keying, you can double the amount of data encoded to 250

Kbps per channel, yielding a 12-Mbps data rate. And by using 16-level quadrature

amplitude modulation encoding 4 bits per hertz, you can achieve a data rate of

24 Mbps. The 802.11a/g standard specifies that all 802.11a/g-compliant products

must support these basic data rates. The standard also lets the vendor extend the

modulation scheme beyond 24 Mbps. Remember, the more bits per cycle (hertz)

that are encoded, the more susceptible the signal will be to interference and

fading, and ultimately, the shorter the range, unless power output is increased.

Device Name

Also known as DHCP client ID or network name. Sometimes provided by an ISP

when using DHCP to assign addresses.

DHCP (Dynamic Host Configuration Protocol)

This protocol allows a computer (or many computers on your network) to be

automatically assigned a single IP address from a DHCP server.

DNS Server Address (Domain Name System)

DNS allows Internet host computers to have a domain name and one or more IP

addresses. A DNS server keeps a database of host computers and their respective

domain names and IP addresses, so that when a user enters a domain name into

the Internet browser, the user is sent to the proper IP address. The DNS server

address used by the computers on your home network is the location of the DNS

server your ISP has assigned.

DSL Modem (Digital Subscriber Line)

A DSL modem uses your existing phone lines to transmit data at high speeds.

Direct-Sequence Spread Spectrum (for 802.11b)

Spread spectrum (broadband) uses a narrowband signal to spread the

transmission over a segment of the radio frequency band or spectrum. 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.