-----T-----

telnet. IP protocol that lets a user on one host establish and use a virtual terminal connection to a remote host.

TR-064.TR-064 is a LAN-side DSL Gateway configuration specification; an extension of UPnP. It defines more services to locally manage a Gateway.

TR-069.TR-069 is a WAN-side DSL Gateway Management specification; pro- vides services similar to UPnP and TR-064. The communication between a Gateway and management agent in UPnP and TR-064 is strictly over the LAN, whereas the communication in TR-069 is over the WAN link for some features and over the LAN for others. TR-069 allows a remote Auto-Config Server to provision and manage a Gateway.

twisted pair. Cable consisting of two copper strands twisted around each other. The twisting provides protection against electromagnetic interference.

-----U-----

UTP. Unshielded twisted pair cable.

-----V-----

VDSL. Very high rate Digital Subscriber Line. VDSL transmits high speed data over short reaches of twisted-pair copper telephone lines, with a range of speeds depending upon actual line length. Both data channels will be separated in frequency from bands used for POTS and ISDN, enabling ser- vice providers to overlay VDSL on existing services. At present the two high speed channels will also be separated in frequency.

VJ. Van Jacobson. Abbreviation for a compression standard documented in RFC 1144.

VLAN. Virtual Local Area Network. A network of computers that behave as if they are connected to the same wire even though they may be physically located on different segments of a LAN. VLANs are configured in software rather than hardware.

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