Open Transport

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What Does Open Transport Mean?

Open Transport is a communications protocol for networks and Macintosh operating systems.

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In 1995, Open Transport replaced MacTCP, which was Mac’s TCP/IP standard implementation through OS version 7.5.1.

Techopedia Explains Open Transport

Open Transport supports AppleTalk and launched with the Peripheral Component Interconnect (PCI)-based Power Mac 9500 (version 7.5.2). Open Transport is built on Mentat Portable Streams (MPS), which is a Unix-originated System V STREAMS platform that supports Transmission Control Protocol/Internet Protocol (TCP/IP).

Open Transport was eventually replaced by Mac OS X, but Open Transport application programming interfaces (API) are available as compatibility layers for older applications.

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Margaret Rouse
Technology Expert
Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.