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  Home : ITU-T : Publications : Recommendations : X Series : X.21 : X.21 (09/92)
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X.21 : Interface between Data Terminal Equipment and Data Circuit-terminating Equipment for synchronous operation on public data networks

Recommendation X.21 (09/92)

Approved in 1992-09-10

Status : In force

 

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PDF Document PDF (acrobat)

486820 bytes 1993-03-10 E 3105 
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PDF Document PDF (acrobat)

527160 bytes 1993-03-10 S 3106 
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PDF Document PDF (acrobat)

530401 bytes 1993-03-10 F 3104 

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Word Document Word

606213 bytes 1993-03-10 E 3105  Download
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674854 bytes 1993-03-10 S 3106  Download
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Word Document Word

658584 bytes 1993-03-10 F 3104  Download

 

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