OSI


Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Wikipedia.

OSI

(networking)

OSI

(2)

OSI

(1) (Open System Interconnection) An ISO standard for worldwide communications that defines a framework for implementing protocols in seven layers. Control is passed from one layer to the next, starting at the application layer in one station, proceeding to the bottom layer, over the channel to the next station and back up the hierarchy.

Never Completely Defined
At one time, most vendors agreed to support OSI in one form or another, but OSI was too loosely defined and proprietary standards were too entrenched. Except for the OSI-compliant X.400 and X.500 email and directory standards, which are widely used, what was once thought to become the universal communications standard now serves as the teaching model for all other protocols.

A Reference Model
The OSI serves as a reference model for all network protocols because its functionality exists in all communications systems, although two or three OSI layers may be incorporated into one. For details of the layers, see OSI model. For comparisons between the OSI model and other protocol stacks, see TCP/IP, NetWare, ATM, SNA and SS7.

(2) (Open Source Initiative) A non-profit corporation dedicated to promoting open source software. The OSI logo on software certifies that it is distributed under one of several approved licenses. For more information, visit www.opensource.org. See open source.


An Approved License
This logo can be used if software is distributed under one of several licenses approved by the Open Source Initiative.
References in periodicals archive ?
Yes, OSI will charge you $12 per trip and you won't need that $26.
At a May 1991 meeting with Hadley and several others at NIH, Healy expressed strong reservations about the way OSI operates, referring to OSI staff as "the keystone cops" and characterizing OSI as "out of control," according to Hadley's testimony.
Manoocher Mansouri, President of OSI Optoelectronics, stated, "We are pleased to receive this contract from such a respected customer.
OSI Pharmaceuticals is committed to "shaping medicine and changing lives" by discovering, developing and commercializing high-quality and novel pharmaceutical products that extend life or improve the quality of life for patients with cancer, eye diseases, and diabetes.