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1813 VoIP Gateway User’s Guide
subnet: An independent network segment, that is, it has the same network address, but its
subnet address is different.
switch: A data switch connects computing devices to host computers, enabling multiple devices
to share a limited number of ports. An electrical switch is a device for making, breaking, or
changing the connections in an electrical circuit.
synchronous transmission: Transmission with the transmitter and receiver synchronized so
that data is transmitted at a fixed rate.
synchronous: Any operation that is controlled by a clock or timing mechanism. (Compare with
asynchronous).
TCP/IP: Transmission control protocol/Internet protocol, a set of protocols that govern peer-to-
peer connectivity functions for local and wide area networks.
TCP: Transmission Control Protocol.
Telnet: The TCP/IP virtual terminal protocol that allows a user at one site to access a remote
system at another site.
throughput: The number of bits, characters, or blocks that are able to pass through a data
communication system.
training: A process where two modems try to determine the correct protocols and transmission
speeds to establish a communication session.
trellis-coded modulation: Advanced error correction coding technique for forward error
correction to a modulation scheme by adding an additional bit to each baud.
UDP: User Datagram Protocol. A connectionless protocol that converts data messages generated
by an application into packets to be sent over IP.
UNIX: An operating system developed at AT&T Bell Laboratories.
upload: To receive a file transmitted over a network.
URL: Uniform Resource Locator. An Internet standard addressing protocol for describing the
location and access method of a resource on the Internet.
USB: Universal Serial Bus. A bi-directional, isochronous, serial interface for adding
dynamically connectable peripheral devices, without the need for a reboot.
UTP: Unshielded twisted pair is the most common kind of copper telephone wiring.
VC: Virtual Circuit. A logical connection or packet-switching mechanism established between
two devices at the start of transmission.
VCI: Virtual Channel Identifier. The 16-bit field in an ATM cell header that specifies the virtual
channel over which the cell is to be transmitted.
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