TALI - Transport Adapter Layer Interface

TCAP - Transaction Capabilities Application Part, enables the deployment of advanced intelligent network services by supporting non-circuit related information exchange between signalling points using the SCCP connectionless service (SS7).

TCP - Transmission Control Protocol, provides a reliable stream delivery and virtual connection service to applications through the use of sequenced acknowledgement with retransmission of packets when necessary (TCP/IP).

TDP - Tag Distribution Protocol, a two party protocol that runs over a connection oriented transport layer with guaranteed sequential delivery.

TELNET - Terminal emulation protocol of TCP/IP.

TFTP - Trivial File Transfer Protocol, supports file writing and reading (TCP/IP).

THDR - Transport Layer Header, used by RTP endpoints to provide correct processing of the packet (SNA).

Timeplex (BRE2) - Bridge Relay Encapsulation, proprietary Ascom Timeplex protocol that extends bridging across WAN links by means of encapsulation (Frame Relay).

Token Ring - LAN protocol where all stations are connected in a ring and each station can directly hear transmissions only from its immediate neighbor.