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1813 VoIP Gateway User’s Guide
VDSL: Very-high-speed DSL. A DSL protocol running at up to 52 Mbps, that is restricted to
short distances.
virtual circuit: A logical circuit established between two devices at the start of transmission
VOD: Video On Demand. A service that provides video to subscribers upon request.
VPI: Virtual Path Identifier
VPI: Virtual Path Identifier. The 8-bit field in an ATM cell header that specifies the routing path
for a cell.
VPN: Virtual Private Network. A network implemented over a public network that is made
“private” by use of encryption.
VT100: A terminal used for asynchronous communications.
WAN: Wide area network. A communications network that connects geographically separated
areas (Compare with LAN).
xDSL: A generic term for all varieties of DSL.
XOFF: A character that notifies a device to stop transmitting data.
XON: A character that notifies a device to start or resume transmitting data.
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