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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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Table of Contents

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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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Word Document Word

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

66847 bytes 1994-05-16 S�4426� Download
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Word Document Word

68490 bytes 1994-05-16 F�4424� Download

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