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: E.550 |
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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) |
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Superseded and Withdrawn components |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) |
Grade-of-service and new performance criteria under failure conditions in international telephone exchanges
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Superseded
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