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  Home : ITU-T : Publications : Recommendations : Q Series : Q.521 : Q.521 (03/93)
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Q.521 : Digital exchange functions

Recommendation Q.521 (03/93)

Approved in 1993-03-01

Status : In force

 

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PDF Document PDF (acrobat)

76827 bytes 1994-05-16 E 4425 
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PDF Document PDF (acrobat)

86017 bytes 1994-05-16 S 4426 
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PDF Document PDF (acrobat)

89385 bytes 1994-05-16 F 4424 

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54161 bytes 1994-05-16 E 4425  Download
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Word Document Word

68490 bytes 1994-05-16 F 4424  Download

 

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Updated : 2003/07/21