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Q.522 : Digital exchange connections, signalling and ancillary functions

Recommendation Q.522 (11/88)

Approved in 1988-11

Status : In force

Replaces Q.503 (1984) and Q.513 (1984)


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PDF Document PDF (acrobat)

143683 bytes 1990-01-04 E 12131 
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PDF Document PDF (acrobat)

188526 bytes 1990-01-04 S 12131 
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PDF Document PDF (acrobat)

195189 bytes 1990-01-04 F 12131 

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