2Wire 3801HGV manual Channel Frequency

HomePortal 3801HGV Gateway User Guide Glossary

Term	Description
SYN Flood	A method that the user of a hostile client program can use to conduct a denial-of-
	service (DOS) attack on a computer server. The hostile client repeatedly sends SYN
	(synchronization) packets to every port on the server, using fake IP addresses.
TCP/IP (Transmission Control	A method of packet-switched data transmission used on the Internet. The protocol
Protocol/Internet Protocol)	specifies the manner in which a signal is divided into parts, as well as the manner in
	which “address” information is added to each packet to ensure that it reaches its
	destination and can be reassembled into the original message.
UDP (User Datagram Protocol)	A TCP/IP protocol describing how data packets reach application programs within a
	destination computer.
VPI (Virtual Path Identifier)	Identifier contained in the ATM cell header to designate the virtual path on the
	physical ATM link.
VCI (Virtual Channel Identifier)	Identifier contained in the ATM cell header to designate the virtual channel on the
	physical ATM link.
Wireless	Transmission of data over radio waves rather than wiring.
Wireless Channel	The 2Wire gateway supports up to 13 wireless channels (based on country
	restrictions).
	For example, the United States and Canada support channels 1 to 11; Europe and
	Australia support channels 1 to 13.
	In an 802.1b or 802.11g wireless network, data is transmitted at 2.5GHz. Wireless
	nodes communicate with each other using radio frequency signals in the band
	between 2.4GHz and 2.5GHz. Neighboring channels are 5 MHz apart; however, due
	to the spread spectrum effect of the signals, a node sending signals using a particular
	channel will use frequency spectrum 12.5HHz above and below the center channel
	frequency. As a result, two separate wireless networks using neighboring channels
	(for example, channels 1 and 2) in the same general vicinity will interfere with each
	other. Applying two channels that allow the maximum channel separation (such as
	channels 1 and 6, or channels 6 and 11) will provide a noticeable performance
	increase over networks with minimal channel separation.
	The radio frequency channels used in 802.11b/g networks are shown in the following
	table:

Channel	Frequency
Channel 1	2399.5	MHz-2424.5 MHz
Channel 2	2404.5	MHz-2429.5 MHz
Channel 3	2409.5	MHz - 2434.5 MHz
Channel 4	2414.5	MHz - 2439.5 MHz
Channel 5	2419.5	MHz - 2444.5 MHz
Channel 6	2424.5	MHz - 2449.5 MHz
Channel 7	2429.5	MHz - 2454.5 MHz
Channel 8	2434.5	MHz - 2459.5 MHz
Channel 9	2439.5	MHz - 2464.5 MHz
Channel 10	2444.5	MHz - 2469.5 MHz
Channel 11	2449.5	MHz - 2474.5 MHz
Channel 12	2454.5	MHz - 2479.5 MHz
Channel 13	2459.5	MHz - 2484.5 MHz

The preferred channel separation between the channels in neighboring wireless networks is 25 MHz (5 channels). This means that you can apply up to three different channels within your wireless network. There are only 11 usable wireless channels in the United States. It is recommended that you start using channel 1 and expand to channel 6 (and 11 when necessary), as these three channels do not overlap.

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