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Upgrade - To replace existing software or firmware with a newer version.
Upload - To transmit a file over a network. In a communications session,
upload means transmit, download means receive.
UTP - Unshielded twisted pair is the most common kind of copper telephone
wiring. Twisted pair is the ordinary copper wire that connects home and many
business computers to the telephone company. To reduce crosstalk or electro-
magnetic induction between pairs of wires, two insulated copper wires are
twisted around each other. Each signal on twisted pair requires both wires.
Since some telephone sets or desktop locations require multiple connections,
twisted pair is sometimes installed in two or more pairs, all within a single
cable.
VLAN (Virtual LAN) - A logical association that allows users to communi-
cate as if they were physically connected to a single LAN, independent of the
actual physical configuration of the network.
127
Layer 2 Management 4-Port Gigabit Ethernet Switch
ProConnect II
®
Series
126
TCP (Transmission Control Protocol) - A method (protocol) used along with
the IP (Internet Protocol) to send data in the form of message units (data-
gram) between network devices over a LAN or WAN. While IP takes care of
handling the actual delivery of the data (routing), TCP takes care of keeping
track of the individual units of data (called packets) that a message is divided
into for efficient delivery over the network. TCP is known as a "connection
oriented" protocol due to requiring the receiver of a packet to return an
acknowledgment of receipt to the sender of the packet resulting in transmis-
sion control.
TCP/IP (Transmission Control Protocol/Internet Protocol) - The basic com-
munication language or set of protocols for communications over a network
(developed specifically for the Internet). TCP/IP defines a suite or group of
protocols and not only TCP and IP.
Telnet - A terminal emulation protocol commonly used on the Internet and
TCP/IP-based networks. It allows a user at a terminal or computer to log onto
a remote device and run a program.
Throughput - The amount of data moved successfully from one place to
another in a given time period.
Topology - A network's topology is a logical characterization of how the
devices on the network are connected and the distances between them. The
most common network devices include hubs, switches, routers, and gateways.
Most large networks contain several levels of interconnection, the most
important of which include edge connections, backbone connections, and
wide-area connections.
TX Rate - Transmission Rate.
UDP (User Datagram Protocol) - A method (protocol) used along with the IP
(Internet Protocol) to send data in the form of message units (datagram)
between network devices over a LAN or WAN. While IP takes care of han-
dling the actual delivery of the data (routing), UDP takes care of keeping
track of the individual units of data (called packets) that a message is divided
into for efficient delivery over the network. UDP is known as a "connection-
less" protocol due to NOT requiring the receiver of a packet to return an
acknowledgment of receipt to the sender of the packet (as opposed to TCP).