User's Manual Part 5

Access / One

Network

200 Glossary of Terms

Tunneling

A technology that enables one network to send its data via another network's

connections. Tunneling works by encapsulating a network protocol within

packets carried by the second network. For example, Microsoft's PPTP

technology enables organizations to use the Internet to transmit data across a

Virtual Private Network (VPN). It does this by embedding its own network

protocol within the TCP/IP packets carried by the Internet. See also, PPTP and

VPN.

twisted-pair wire

Type of medium using metallic type conductors twisted together to provide a

path for current flow. The wire in this medium is twisted in pairs to minimize the

electromagnetic interference between one pair and another.

UDP

(User Data Protocol) A connectionless protocol that works at the OSI transport

layer. UDP provides datagram transport but does not acknowledge their receipt.

URL

(Uniform Resource Locator) The standard method used for identifying the

location of information available to the Internet.

VLAN

(Virtual LAN) A group of devices that communicate as a single network, even

though they are physically located on different LAN segments. Because VLANs

are based on logical rather than physical connections, they are extremely

flexible. A device that is moved to another location can remain on the same

VLAN without any hardware reconfiguration.

VoIP

(Voice over IP) The ability of an IP network to carry telephone voice signals as IP

packets in compliance with International Telecommunications Union

Telecommunication Standardization Sector (ITU-T) specification H.323. VoIP

enables a router to transmit telephone calls and faxes over the Internet with no

loss in functionality, reliability, or voice quality.