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  Home : ITU-T : Publications : Recommendations : X Series : X.21 : X.21 (11/88)
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X.21 : Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for synchronous operation on public data networks

Recommendation X.21 (11/88)

Approved in 1988-11-25

Status : Superseded

 

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Updated : 2009/11/13