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Q.521 : Digital exchange functions

Recommendation Q.521

In force components
Number
Title Status
Q.521 (03/93)
 
Digital exchange functions   In force
 
 
Superseded and Withdrawn components
Number
Title Status
Q.521 (11/88)
 
Exchange functions  
Replaces Q.503 (1984) and Q.513 (1984)
Superseded

 

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Updated : 2008/04/24