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Q.140-Q.180 : Specifications of Signalling System No. 5

Recommendation Q.140-Q.180 (11/88)

Approved in 1988-11

Status : In force

 

Table of Contents

Initially published in Blue Book Fascicle VI.2 (1988). Available now in electronic format only. This set includes the amendments introduced on 12 March 1993 on Q.141 and Q.144


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