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| E.550�:�Grade-of-service and new performance criteria under failure conditions in international telephone exchanges
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| In force components |
Number
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Title |
Status |
E.550 (03/93)
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Grade-of-service and new performance criteria under failure conditions in international telephone exchanges
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In force
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| Superseded and Withdrawn components |
Number
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Title |
Status |
E.550 (11/88)
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Grade-of-service and new performance criteria under failure conditions in international telephone exchanges
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Superseded
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