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Grade of service
In telecommunication, the quality of voice service is specified by two measures: The GOS (Grade of Service) and the QoS (Quality of Service).
Grade of service is the probability of a call in a circuit group being blocked or delayed for more than a specified interval, expressed as a fraction or decimal fraction. This is always with reference to the busy hour when the traffic intensity is the greatest. Grade of service may be viewed independently from the perspective of incoming versus outgoing calls, and is not necessarily equal in each direction or between different source-destination pairs.
On the other hand, the quality of service which a single circuit is designed or conditioned to provide, e.g. voice grade or program grade is called the quality of service. Criteria for different qualities of service may include equalization for amplitude over a specified band of frequencies, or in the case of digital data transported via analogue circuits, or include equalization for phase also.
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