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Computer System Reliability

Probability that a computer system will be operable throughout its mission duration (only takes into account the effects of failure of the system)

Computer System Availability

Probability that a computer system will be operable at a future time (takes into account the effects of failure and repair/maintenance of the system)

Computer Room Air Conditioning (CRAC)

A modular packaged environmental control unit designed specifically to maintain the ambient air temperature and/or humidity of spaces that typically contain data communcations equipment. These products can typically perform all (or a subset) of the following functions: cool, reheat, humidify, dehumidify. They may have multiple steps for some of these functions.

Compute-intensive

Term that applies to any computer application that demands a lot of computation, such as meteorology programs and other scientific applications. A similar but distinct term, computer-intensive, refers to applications that require a lot of computers, such as grid computing. The two types of applications are not necessarily mutually exclusive. Some applications are both compute- and computer-intensive

Compute Server

Servers dedicated for computation or processing that are typically required to have greater processing power (and, hence, dissipate more heat) than servers dedicated solely for storage (also see server)

Compiler

A program that translates (presumably) human-readable source code into a form that is native for a particular machine

Communication Equipment

Equipment used for information transfer. The information can be in the form of digital data for data communications or analog signals for traditional wireline voice communication

Commissioning Plan

A document that defines the verification and testing process to ensure the project delivers what is expected, including training, documentation, and project close-out

Commissioning Levels

* Factory acceptance tests (Level 1 commissioning): Testing of products prior to leaving their place of manufacture
* Field component verification (Level 2 commissioning): Inspection and verification of products upon receipt
* System construction verification (Level 3 commissioning): Field inspections and certifications that components are assembled and properly integrated into systems as required by plans and specifications

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