The connected system where it does not allot IP address to the WAN side port of the rooter which is connected to other network, happens to see 2 rooters and like upper 1 rooters it handles. The rooter which is used with unnumbered has IP address on only LAN side.

When unnumbered connection is done, when the other computer is in the network where 2 rooters have been connected because destination of the packet stops deciding, it is necessary for the rooter to be directly connected. But, with the network which has satisfied the condition 2 units being directly connected, the person who connects with amount and unnumbered where a quantity which allots IP address decreases management becomes simple.

By the way, with PPP (PPPoE) connection as for the rooter of ISP side and the rooter of member side because it is directly connected, the connection with unnumbered has become possible. Making use of this specification, with the regular connection service which utilizes NTT east Japanese west Japanese [huretsutsushirizu], unnumbered connection is adopted when plural it allots IP address.

UPnP

Reading: U tweet n tweet
Full spelling: Universal Plug and Play
Alias:
Universal plug and play
Field:
Windows > UPnP
LAN > Foam/home network > UPnP

To connect equipment such as personal computer and peripheral device, AV equipment, telephone and home appliance product inside home via network, technical specification in order to offer function mutually. It is lectured in 1999 by the Microsoft corporation, 20 corporations or more such as Intel corporation, 3Com corporation, AT&T corporation and Dell Computer corporation has supported. The technology which becomes standard with Internet is designated as the basis, toward the fact that functioning it does has aimed it just connects to network without accompanying complicated operation and setting job. Other than Ethernet which is most widely used for personal computer LAN as network below, also standard inside LAN home such as HomePNA and HomeRF is supported.

UPnP AV

Reading: U tweet n tweet a buoy
Full spelling: Universal Plug and Play Audio Visual
Field:
Multimedia > home appliance /AV equipment > UPnP AV

Standard in order with respect to foam/home network inside LAN and the like home, it searches the contents of image music, and the like transfers to the other equipment and to play back. It was decided by UPnP Forum where Microsoft, Intel, IBM and SONY etc participate in 2002 June. It is the standard which makes UPnP standard in order to connect the personal computer and the digital AV equipment and the home appliance product etc inside foam/home network mutually, for the AV contents specialize.

Discovering the image contents which for example were videotaped to the HDD video recorder by utilizing UPnP AV, dynamically from the personal computer, it plays back with the personal computer, transferring the music contents which are downloaded in the personal computer to the stereo equipment, it plays back and/or it becomes possible to say.

UPS <Uninterruptible power supply>

Reading: U tweet the s
Full spelling: Uninterruptible POWER Supply
Field:
Personal computer > UPS

The device which builds in the electric battery and the generator, supplies electricity to the computer in for a while between even at when having a power failure. As for the user it is possible at this time to end the system safely.