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68     Microsoft Broadband Networking Wireless Base Station User’s Guide 
 
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network adapter 
A computer circuit board, card, or other device used to provide 
network access from a computer to other parts of the network – for 
example, to another computer, a printer, or a base station (gateway 
or router). Adapters can be installed inside a computer, inserted into 
a computer’s expansion slots, or connected to a computer’s ports. 
 
NIC 
Acronym for “Network Interface Card.” A circuit board, expansion 
card, or other device used to provide network access to a computer 
or other network component, such as a printer. Network interface 
cards do the actual sending and receiving of data. 
 
packet 
A unit of information transmitted as a whole from one device to 
another on a network. This is often a piece of a file that has been 
divided up for efficient transmission over the Internet. 
 
PC Card   A credit card-sized device that is inserted into a slot on a computer, 
usually a notebook computer. It was previously called a PCMCIA 
card. There is a newer card standard, the 32-bit Cardbus PC Card.  
 
PCI 
Acronym for “Peripheral Component Interconnect.” A specific local 
bus type that allows up to 10 PCI-compliant expansion cards to be 
installed in a computer. This architecture is designed to speed up 
system performance by allowing some expansion boards to 
communicate directly with the microprocessor. 
 
PCMCIA 
Acronym for “Personal Computer Memory Card International 
Association.” This group defined the standards for the PC Card, a 
type of expansion card designed for notebook computers.  
peer-to-peer network  A network of two or more computers that connect directly with one 
another. 
 
Plug and Play 
Sometimes abbreviated “PnP.” A set of specifications that allow a 
computer to automatically detect and configure various peripheral 
devices, such as monitors, modems, and printers. See “UPnP.” 
 
port 
This term has several meanings: (1) A physical connection through 
which data is transferred between a computer and another 
computer, a network, and other devices (such as a monitor, modem, 
or printer). (2) A software channel for network communications. 
When a client computer communicates through a network with a 
server, it sends its request over a certain numbered channel, called 
a “port.”  
 
port forwarding 
When a base station, gateway, or router passes information between 
your network and the Internet, it filters the information based on 
which software (virtual) ports are being used and how those ports 
are configured. For example, Internet (HTTP) communication, by 
default, travels over port 80. To help ensure security, all other ports 
are blocked from transferring data unless you specifically configure 
those ports to “forward” incoming data to other locations.  
 
PPP 
Acronym for “Point-to-Point Protocol.” A widely used data link 
protocol for transmitting data packets over dial-up telephone 
connections, such as between a computer and the Internet.