In telecommunication, the term open systems architecture means the layered hierarchical structure, configuration, or model of a communications or distributed data processingsystem that (a) enables system description, design, development, installation, operation, improvement, and maintenance to be performed at a given layer or layers in the hierarchical structure, (b) allows each layer to provide a set of accessible functions that can be controlled and used by the functions in the layer above it, (c) enables each layer to be implemented without affecting the implementation of other layers, and (d) 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.
Examples of independent alterations include (a) converting from wire to optical fibers at a physical layer without affecting the data-link layer or the network layer except to provide more traffic capacity, and (b) altering the operational protocols at the network level without altering the physical layer.
Open systems architecture may be implemented using the Open Systems Interconnection--Reference Model (OSI--RM) as a guide while designing the system to meet performance requirements.
OpenArchitecture means that there needs to be plenty of space in mechanical electrical equipment rooms, riser shafts and floor ceiling plenums for upgrade, replacement, maintenance or repair.
OpenArchitecture means that especially the larger and heavier pieces of HVAC and plumbing equipment should be located for easy removal and replacement with equipment that is often larger and more sophisticated.
OpenArchitecture means that access to existing piping and room for new piping and holding tanks on walls and under floors is thought out in advance.
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