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T1
T1 lines, also referred to as DS1 lines, are dedicated phone connections supporting data rates of 1.544 Mbps. A T1 line actually consists of 24 individual channels, each of which supports 64 Kbits per second. Each of these channels can be configured to carry voice or data traffic. Most telephone companies allow you to buy just some of these individual channels, known as fractional T1 access. T1 lines are a popular leased line option for businesses connecting to the Internet.

T3
T3 lines, also referred to as DS3 lines, are dedicated phone connections supporting data rates of about 44 Mbps. A T3 line actually consists of 672 individual channels, each of which supports 64 Kbps.

Time-division multiplexing (TDM)
TDM combines many digital bit streams with relatively low-bit frequencies into a single bit stream with a relatively high-bit frequency. It is, in essence, a way for many slow communications channels to "time share" a very fast channel.

Token Ring
Token Ring is a LAN protocol used in computer networks. Token Ring operates at 4 and 16 Mbps.

Topology
Topology refers to the specific physical configuration of a network or a portion of a network. Ring and star are examples of different network topologies.

Traffic
Traffic refers to the combination of information flow going to and from devices attached to a network.

Transmission Control Protocol (TCP)
TCP is normally used in conjunction with IP in a TCP/IP-based network. The two protocols working together provide for connectivity between applications of networked computers.

Twisted Pair-physical Medium Dependent (TP-PMD)
A FDDI physical layer protocol that provides for the use of twisted-pair cable.