TCP/IP (Transmission Control Protocol/Internet Protocol):
TCP/IP is a set of protocols for Layers three and four of the seven-layer OSI network model. These are respectively, the network and the transport layers.

TDCC (Transportation Data Coordinating Committee):
Sets standards for motor, rail, ocean and air industry, administered by EDIA.

Telecommunications:
A term encompassing both voice and data communications in the form of coded signals over via public or private telecommunications media.

TP(:Trading Partner -- see definition)

TPA (Trading Partner Agreement):
Contractual arrangement between the parties involved in electronic trading covering the EDI specific parts of the exchange of trading information. Also called Interchange Agreement.

TRADACOMS (Trading Data Communications Standard):
An EDI standard used primarily in England and Western Europe.

Trading Partner:
A user with whom another user has agreed to exchange electronic business data -- typically, trading partners are direct customers, suppliers, or intra-company divisions.

Transaction Set:
The term used in electronic data interchange to describe a single document (purchase order, invoices, etc.). The data included in a transaction set will convey the same information as a conventional printed document.

Transmission:
All the data to be transmitted between one user and another, or one user and the VAN.