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Page 146 / 154 Scroll up to view Page 141 - 145
Reference Manual for the 54 Mbps Wireless Router WGR614 v6
-6
Glossary
202-10099-01, April 2005
Gateway
In the wireless world, a gateway is an access point with additional software capabilities such as providing
NAT and DHCP. Gateways may also provide VPN support, roaming, firewalls, various levels of security,
etc.
Hot Spot (also referred to as Public Access Location)
A place where you can access Wi-Fi service. This can be for free or for a fee. HotSpots can be inside a coffee
shop, airport lounge, train station, convention center, hotel or any other public meeting area. Corporations
and campuses are also implementing HotSpots to provide wireless Internet access to their visitors and
guests. In some parts of the world, HotSpots are known as CoolSpots.
Hub
A multiport device used to connect PCs to a network via Ethernet cabling or via Wi-Fi. Wired hubs can have
numerous ports and can transmit data at speeds ranging from 10 Mbps to multigigabyte speeds per second.
A hub transmits packets it receives to all the connected ports. A small wired hub may only connect 4
computers; a large hub can connect 48 or more. Wireless hubs can connect hundreds.
Hz (‘hertz”)
The international unit for measuring frequency, equivalent to the older unit of cycles per second. One
megahertz (MHz) is one million hertz. One gigahertz (GHz) is one billion hertz. The standard US electrical
power frequency is 60 Hz, the AM broadcast radio frequency band is 535—1605 kHz, the FM broadcast
radio frequency band is 88—108 MHz, and wireless 802.11b LANs operate at 2.4 GHz.
IEEE (Institute of Electrical and Electronics Engineers)
A membership organization (
www.ieee.org
) that includes engineers, scientists and students in electronics
and allied fields. It has more than 300,000 members and is involved with setting standards for computers and
communications.
IEEE 802.11
A set of specifications for LANs from The Institute of Electrical and Electronics Engineers (IEEE). Most
wired networks conform to 802.3, the specification for CSMA/CD based Ethernet networks or 802.5, the
specification for token ring networks. 802.11 defines the standard for wireless LANs encompassing three
incompatible (non-interoperable) technologies: Frequency Hopping Spread Spectrum (FHSS), Direct
Sequence Spread Spectrum (DSSS) and Infrared. WECA’s (Wireless Ethernet Compatibility Alliance – now
Wi-Fi Alliance) focus is on 802.11b, an 11 Mbps high-rate DSSS standard for wireless networks.
Infrastructure mode
A client setting providing connectivity to an access point (AP). As compared to Ad-Hoc mode, whereby PCs
communicate directly with each other, clients set in Infrastructure Mode all pass data through a central AP.
The AP not only mediates wireless network traffic in the immediate neighborhood, but also provides
communication with the wired network. See Ad-Hoc and AP.
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Reference Manual for the 54 Mbps Wireless Router WGR614 v6
Glossary
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202-10099-01, April 2005
IP (Internet Protocol) address
A 32-bit number that identifies each sender or receiver of information that is sent across the Internet. An IP
address has two parts: an identifier of a particular network on the Internet and an identifier of the particular
device (which can be a server or a workstation) within that network.
ISO Network Model
A network model developed by the International Standards Organization (ISO) that consists of seven
different levels, or layers. By standardizing these layers, and the interfaces in between, different portions of
a given protocol can be modified or changed as technologies advance or systems requirements are altered.
The seven layers are:
•
Physical
•
Data Link
•
Network
•
Transport
•
Session
•
Presentation
•
Application
The IEEE 802.11 Standard encompasses the physical layer (PHY) and the lower portion of the data link
layer. The lower portion of the data link layer is often referred to as the Medium Access Controller (MAC)
sublayer.
MAC (Media Access Control)
Every wireless 802.11 device has its own specific MAC address hard-coded into it. This unique identifier
can be used to provide security for wireless networks. When a network uses a MAC table, only the 802.11
radios that have had their MAC addresses added to that network's MAC table will be able to get onto the
network.
Mesh Networks
Also called mesh topology, mesh is a network topology in which devices are connected with many
redundant interconnections between network nodes. In a full mesh topology every node has a connection to
every other node in the network. Mesh networks may be wired or wireless.
Page 148 / 154
Reference Manual for the 54 Mbps Wireless Router WGR614 v6
-8
Glossary
202-10099-01, April 2005
In a wireless mesh example, each of the spheres below represent a mesh router. Corporate servers and
printers may be shared by attaching to each mesh router. For wireless access to the mesh, an access point
must be attached to any one of the mesh routers.
Multiple Input Multiple Output (MIMO)
MIMO refers to radio links with multiple antennas at the transmitter and the receiver side to improve the
performance of the wireless link.
NAT (Network Address Translation)
A network capability that enables a houseful of computers to dynamically share a single incoming IP
address from a dial-up, cable or xDSL connection. NAT takes the single incoming IP address and creates
new IP address for each client computer on the network.
Network name
Identifies the wireless network for all the shared components. During the installation process for most
wireless networks, you need to enter the network name or SSID. Different network names are used when
setting up your individual computer, wired network or workgroup.
NIC (Network Interface Card)
A type of PC adapter card that either works without wires (Wi-Fi) or attaches to a network cable to provide
two-way communication between the computer and network devices such as a hub or switch. Most office
wired NICs operate at 10 Mbps (Ethernet), 100 Mbps (Fast Ethernet) or 10/100 Mbps dual speed.
High-speed Gigabit and 10 Gigabit NIC cards are also available. See PC Card.
PC card (also called PCMCIA)
A removable, credit-card-sized memory or I/O (input/output) device that fits into a Type 2 PCMCIA
standard slot, PC Cards are used primarily in PCs, portable computers, PDAs and laptops. PC Card
peripherals include Wi-Fi cards, memory cards, modems, NICs, hard drives, etc.
PCI adapter
A high-performance I/O computer bus used internally on most computers. Other bus types include ISA and
AGP. PCIs and other computer buses enable the addition of internal cards that provide services and features
not supported by the motherboard or other connectors.
Peer-to-peer network (also called Ad-Hoc in WLANs)
A wireless or wired computer network that has no server or central hub or router. All the networked PCs are
equally able to act as a network server or client, and each client computer can talk to all the other wireless
computers without having to go through an access point or hub. However, since there is no central base
station to monitor traffic or provide Internet access, the various signals can collide with each other, reducing
overall performance.
PHY
The lowest layer within the OSI Network Model. It deals primarily with transmission of the raw bit stream
over the PHYsical transport medium. In the case of wireless LANs, the transport medium is free space. The
Page 149 / 154
Reference Manual for the 54 Mbps Wireless Router WGR614 v6
Glossary
-9
202-10099-01, April 2005
PHY defines parameters such as data rates, modulation method, signaling parameters, transmitter/receiver
synchronization, etc. Within an actual radio implementation, the PHY corresponds to the radio front end and
baseband signal processing sections.
Plug and Play
A computer system feature that provides for automatic configuration of add-ons and peripheral devices such
as wireless PC Cards, printers, scanners and multimedia devices.
Proxy server
Used in larger companies and organizations to improve network operations and security, a proxy server is
able to prevent direct communication between two or more networks. The proxy server forwards allowable
data requests to remote servers and/or responds to data requests directly from stored remote server data
Range
The distance away from your access point that your wireless network can reach. Most Wi-Fi systems will
provide a range of a hundred feet or more. Depending on the environment and the type of antenna used,
Wi-Fi signals can have a range of up to mile
Residential gateway
A wireless device that connects multiple PCs, peripherals and the Internet on a home network. Most Wi-Fi
residential gateways provide DHCP and NAT as well.
RJ-45
Standard connectors used in Ethernet networks. Even though they look very similar to standard RJ-11
telephone connectors, RJ-45 connectors can have up to eight wires, whereas telephone connectors have only
four.
Roaming
Moving seamlessly from one AP coverage area to another with your laptop or desktop with no loss in
connectivity.
Rogue Access Point
"Rogue AP" is a term used to describe an unauthorized access point that is connected on the main home or
corporate network or operating in a stand-alone mode (in a parking lot or in a neighbor's building). Rogue
APs, by definition, are not under the management of network administrators and do not conform to network
security policies and may present a severe security risk. Ideally, it is best to have some type of WLAN
system that does not allow rogue access points to easily be added to an existing WLAN.
Router
A device that forwards data packets from one local area network (LAN) or wide area network (WAN) to
another. Based on routing tables and routing protocols, routers can read the network address in each
transmitted frame and make a decision on how to send it via the most efficient route based on traffic load,
line costs, speed, bad connections, etc.
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Reference Manual for the 54 Mbps Wireless Router WGR614 v6
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Glossary
202-10099-01, April 2005
Satellite broadband
A wireless high-speed Internet connection provided by satellites. Some satellite broadband connections are
two-way—up and down. Others are one-way, with the satellite providing a high-speed downlink and then
using a dial-up telephone connection or other land-based system for the uplink to the Internet.
Server
A computer that provides its resources to other computers and devices on a network. These include print
servers, Internet servers and data servers. A server can also be combined with a hub or router.
Site survey
The process whereby a wireless network installer inspects a location prior to putting in a wireless network.
Site surveys are used to identify the radio- and client-use properties of a facility so that access points can be
optimally placed.
SSID (also called ESSID)
A 32-character unique identifier attached to the header of packets sent over a WLAN that acts as a password
when a mobile device tries to connect to the BSS. (Also called ESSID.) The SSID differentiates one WLAN
from another, so all access points and all devices attempting to connect to a specific WLAN must use the
same SSID.
A device will not be permitted to join the BSS unless it can provide the unique SSID. Because an SSID can
be sniffed in plain text from a packet, it does not supply any security to the network. An SSID is also
referred to as a Network Name because essentially it is a name that identifies a wireless network.
SSL (Secure Sockets Layer)
Commonly used encryption scheme used by many online retail and banking sites to protect the financial
integrity of transactions. When an SSL session begins, the server sends its public key to the browser. The
browser then sends a randomly generated secret key back to the server in order to have a secret key
exchange for that session.
Subnetwork or Subnet
Found in larger networks, these smaller networks are used to simplify addressing between numerous
computers. Subnets connect to the central network through a router, hub or gateway. Each individual
wireless LAN will probably use the same subnet for all the local computers it talks to.
Switch
A type of hub that efficiently controls the way multiple devices use the same network so that each can
operate at optimal performance. A switch acts as a networks traffic cop: rather than transmitting all the
packets it receives to all ports as a hub does, a switch transmits packets to only the receiving port.
TCP (Transmission Control Protocol)
A protocol used along with the Internet Protocol (IP) to send data in the form of individual units (called
packets) between computers over the Internet. While IP takes care of handling the actual delivery of the
data, TCP takes care of keeping track of the packets that a message is divided into for efficient routing
through the Internet.

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