This International Standard specifies the 34- pole connector and the assignment of contact numbers at the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) where ITU-T Recommendation V.36 or Recommendation X.21bis together with Recommendation V.10 and V.11 are applicable. NOTE 1 An interoperation between interfaces designed according to electrical characteristics specified in ITU-T Recommendation V.36 and those specified in ITU-T Recommendation V.11 is, at least to a limited degree, possible. This can be achieved, for example, by using a passive adaptor which joins the interface connectors in accordance with ISO/IEC 2593 and ISO 4902, or ISO 4903, respectively. This International Standard specifies the dimensions of the connector housing and gives recommendations for the type of locking device (jack-screw system) and connector shielding.