E.550�:�Grade-of-service and new performance criteria under failure conditions in international telephone exchanges

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E.550�:�Grade-of-service and new performance criteria under failure conditions in international telephone exchanges �

Recommendation E.550 (11/88)

Approved in 1988-11-25

Status : Superseded

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2008-02-12

E�32205�

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2008-02-12

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2008-02-12

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2008-02-12

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