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Redirect [[OSI model#Open systems architecture]]
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{{R from merge}} {{R to [[OSI model#Open systems architecture|Open systems architecture]]}}
{{unreferenced|date=March 2009}}
{{notability|date=March 2009}}
{{context|date=June 2018}}}}
'''Open systems architecture''', in [[telecommunication]], is a standard that describes the layered hierarchical structure, [[computer configuration|configuration]], or model of a [[information transfer|communications]] or distributed [[data processing]] [[system]] that:
* Enables system description, design, development, installation, operation, improvement, and [[repair and maintenance|maintenance]] to be performed at a given [[Abstraction layer|layer]] or layers in the hierarchical structure
* Allows each layer to provide a set<!--non-technical use, don't link--> of accessible functions that can be controlled and used by the functions in the layer above it
* Enables each layer to be implemented without affecting the implementation of other layers
* Allows the alteration of system performance by the modification of one or more layers without altering the existing equipment, procedures, and protocols at the remaining layers
Open systems architecture may be implemented using the [[OSI Model]] as a guide while designing the [[system]] to meet performance requirements.
== Examples of independent alterations ==
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