Definition

Transport Services Access Point (TSAP)

Contributor(s): Meredith Page

A Transport Services Access Point (TSAP) is an end-point for communication between the Transport layer (layer 4) and the Session layer in the OSI (Open Systems Interconnection) reference model. Each TSAP is an address that uniquely identifies a specific instantiation of a service. TSAPs are created by concatenating the node's Network Service Access Point (NSAP) with a transport identifier, and sometimes a packet and/or protocol type.

This was last updated in September 2005

Dig Deeper on Network Infrastructure

logistics Logistics is the process of planning and executing the efficient transportation and storage of goods from the point of origin to the point of consumption.

Transport Layer Security (TLS) Transport Layer Security (TLS) is a protocol that provides authentication, privacy, and data integrity between two communicating computer applications.

SSL VPN (Secure Sockets Layer virtual private network) An SSL VPN is a type of virtual private network that uses the Secure Sockets Layer protocol -- or, more often, its successor, the Transport Layer Security (TLS) protocol -- in standard web browsers to provide secure, remote-access VPN capability.

physical layer Located at the lowest layer of the Open Systems Interconnection (OSI) communications model, the physical layer's function is to transport data using electrical, mechanical or procedural interfaces.

transport layer Positioned at Layer 4 of the Open Systems Interconnection (OSI) communications model, the transport layer ensures the reliable arrival of messages across a network and provides error-checking mechanisms and data flow controls.

PPP (Point-to-Point Protocol) PPP (Point-to-Point Protocol) is a standard used to establish a direct connection between two network nodes that enables the transport of multiprotocol data.

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