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156 Glossary
Glossary
switch
A device that filters and forwards packets between LAN segments.
Switches operate at the data link layer (layer 2) and sometimes the
network layer (layer 3) of the OSI Reference Model and therefore support
any packet protocol. LANs that use switches to join segments are called
switched LANs or, in the case of Ethernet networks, switched Ethernet
LANs. A hub connects all the devices on its “ports” together.
A switch is a bit smarter, as it understands when two devices (out of four,
five, eight, sixteen, or even more) want to talk to each other and gives
them a switched connection.
symbolic name
A name corresponding to a single interface. This name uniquely
identifies the interface on a controller or gateway. If there is more than
one interface on the controller or gateway, each interface must have a
unique symbolic name.
U Universal Plug and Play
Universal Plug and Play (UPnP) is an open industry standard that uses
Internet and Web protocols to enable devices such as PCs, peripherals,
intelligent appliances, and wireless devices to be plugged into a network
and automatically know about each other.
UPnP is an architecture for pervasive peer-to-peer network connectivity
of PCs and intelligent devices or appliances. UPnP builds on Internet
standards and technologies, such as TCP/IP, HTTP, and XML, to enable
LAN devices to automatically connect with one another and work
together.
With UPnP, when a user plugs a device into the network, the device will
configure itself, acquire a TCP/IP address, and use a discovery protocol
based on the Internet's Hypertext Transfer Protocol (HTTP) to announce
its presence on the network to other devices. UPnP devices use
Extensible Markup Language (XML) to establish a common language, or
“protocol negotiation”, to talk to each other and determine capabilities.
The E5810 has two options for Universal Plug and Play (UPnP):
Option ON: The E5810 is configured as a UPnP device and provides
information to the network about itself via an XML description when
mounted to the network.