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____ were formalized in Asynchronous Transfer Mode (ATM) networks.

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____ were formalized in Asynchronous Transfer Mode (ATM) networks.

(a) Quality of service metrics

(b) Quality of service contracts

(c) Grade of service metrics

(d) Grade of service contracts

The question was posed to me during a job interview.

Origin of the question is Radio Resource Analysis in portion Software Defined Radio Architecture of Cognitive Radio

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The correct option is (b) Quality of service contracts

Explanation: Quality of service contracts were formalized in asynchronous transfer mode networks. The ATM access protocols determine the quality of end to end connections to be offered by a network. These networks add bit errors and delay packets to accomplish their service.

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