annel is 4,000Hz. telephony A generic term for voice telecommunications Telnet The TCP/IP site protocol that supports a remote login capability. tera One trillion. terabit switch router A class of backbone platform that supports Tbps capacity. This type of router is agnostic, and it involves short and predictable delay, robust QoS features, multicast sup- port, and carrier-class availability. terminal (1) A point at which information can enter or leave a communication network. (2) Any device capable of sending and/or receiving information over a communications channel. (3) A workstation. terminal multiplexer A device that permits two or more terminals to share one cable as a data transmission path. terminal server A device that connects terminals to a network that is typically running Ethernet. thicknet (thick Ethernet cable) thicknet (thick Ethernet cable) Coaxial cable with electrical characteristics that meet the 10BASE5 specification for Ethernet networks. Thicknet enables a signal to be carried as far as 1,640 feet (500 m) before requiring a repeater. Also called 10BASE5 cable. thinnet (thin Ethernet cable) Coaxial cable with electrical characteristics that meet the 10BASE2 specification for Ethernet networks. Thinnet enables a signal to be carried as far as 607 feet (185 m) before requiring a repeater. Also called 10BASE2 cable or cheapernet. throughput The useful information processed or communicated during a specific time period, expressed in bits per second or packets per second. TIA (Telecommunications Industry Association) An organization that recommends standards for telecommunications time division switching A switching method for a TDM channel that requires the shifting of data from one slot to another in the TDM frame. The slot in question can carry a bit, a byte, or, in principle, any other unit of data. timeout A set time period for waiting before a terminal system performs some action. Typical uses include a poll release (when a terminal is disconnected if the time-out period elapses before keyi