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  Home : ITU-T : Publications : Recommendations : E Series : E.550 : E.550 (11/88)
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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Status : Superseded

 

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261524 bytes 2008-02-12 E 32205 
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262654 bytes 2008-02-12 S 32205 
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260904 bytes 2008-02-12 F 32205 

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Updated : 2013-10-02