OSI definition of OSI in the Free Online Encyclopedia.

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 e-mail 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.

1.	(networking)	OSI - Open Systems Interconnection.
2.		OSI - Open Source Initiative.

Mentioned in	?		References in periodicals archive	?		Encyclopedia browser	?		Full browser	?
No references found	OSI's leadership said they would continue to add other complementary businesses both in the United States and abroad under the OSI umbrella. OSI raises $4.8 million in series a funding by Orthopedic Design & Technology Hawthorne, CA 12/23/02 -- OSI Systems has filed a complaint against L-3 Communications alleging that L-3 defrauded and breached fiduciary duties related to OSI and L-3's joint bid for the Detection Systems business L-3 purchased earlier this year from PerkinElmer (see IBO 1/15/02). OSI takes L-3 to court. (Executive briefing: news, trends & market ... by Instrument Business Outlook The corrected release reads: OSI SYSTEMS TO PRESENT AT THE 2009 UBS GLOBAL LIFE SCIENCES CONFERENCE OSI Systems, Inc. OSI Systems to Present at the 2009 UBS Global Life Sciences Conference by Business Wire	Osh Osh Oblast Osh-Pando Osha Oshanin, Lev Oshanin, Lev Ivanovich Oshanin, Lev Vasilevich Oshanin, Vasilii Oshanin, Vasilii Fedorovich Oshanina, Mariia Oshanina, Mariia Nikolaevna Oshawa Oshea Osher Markovich Shvartsman Osher Shvartsman Oshima Oshio Heihachiro Oshkaln, Otomar Oshkaln, Otomar Petrovich Oshki Oshkosh Oshmiany Oshmiany Upland Oshogatsu Oshogbo OSI OSI model OSI Reference Model OSI seven layer model OSI stack OSI-RM Osiander, Andreas osier Osijek Osinki Osinniki Osinovka Osinskii Osinskii, Valerian Osinskii, Valerian Andreevich OSINT Osintorf OSIP Osip Abdulov Osip Afanasevich Petrov Osip Antonovich Kozlovskii Osip Aptekman Osip Bodianskii Osip Bove Osip Deribas Osip Emilevich Mandelshtam	OSHN OSHNA OSHNET Osho Osho Osho International Foundation Oshogatsu Oshogatsu Oshogbo Oshogbo Oshogbo OSHP OSHPD OSHPP OSHPR OSHR OSHRC OSHRKS OSHRP OSHS OSHSB OSHT OSHTC Oshun OSHW Oshwal Elderly Welfare Association OSHWM OSHWPP OSI Osi 7 layer model OSI 7-layer model OSI 95 OSI Implementers Workshop OSI Internet Management OSI layer OSI layer 1 OSI layer 2 OSI layer 3 OSI layer 4 OSI layer 5 OSI layer 6 OSI layer 7 Osi layers OSI Library Interface OSI model OSI Network Address OSI Presentation Address OSI reference model OSI RM OSI seven layer model OSI seven-layer model OSI stack OSI System Management Function

Mentioned in

References in periodicals archive

Encyclopedia browser

Full browser

No references found

OSI's leadership said they would continue to add other complementary businesses both in the United States and abroad under the OSI umbrella.

OSI raises $4.8 million in series a funding by Orthopedic Design & Technology

Hawthorne, CA 12/23/02 -- OSI Systems has filed a complaint against L-3 Communications alleging that L-3 defrauded and breached fiduciary duties related to OSI and L-3's joint bid for the Detection Systems business L-3 purchased earlier this year from PerkinElmer (see IBO 1/15/02).

OSI takes L-3 to court. (Executive briefing: news, trends & market ... by Instrument Business Outlook

The corrected release reads: OSI SYSTEMS TO PRESENT AT THE 2009 UBS GLOBAL LIFE SCIENCES CONFERENCE OSI Systems, Inc.

OSI Systems to Present at the 2009 UBS Global Life Sciences Conference by Business Wire