Plug connection part of a plug connection for a data transmission cable with a plurality of electrical conductors, comprising a connection housing made of an electrically insulating material and for each electrical conductor of the data transmission cable a connection contact element held by the connection housing, with respectively one insulation displacement contact (31.1) or a piercing contact for contacting the electrical conductor by way of the electrical conductor being moved in a radial wiring direction relative to the plug connection part and with respectively one contact (13.1) for contacting corresponding contacts of a corresponding counterpiece of the plug connection part , wherein each insulation displacement contact (31.1), respectively each piercing contact, is electrically connectable with one of the contacts, wherein the wiring direction of the contact elements of a first group of connection contact elements is opposite to the wiring direction of a second group of contact elements, wherein axially extending connection sections (31.3) of the contact elements of the first group run in a first plane and axially extending connection sections (31.3) of the contact elements of the second group run in a second plane differing therefrom and wherein the connection housing is formed in such a way that the connection contact elements cannot be inserted into the connection housing from an outside, characterised in that the connection housing is composed of at least two housing parts , a first housing part as well as a second housing part of the connection housing supports a plurality of connection contact elements and the connection contact elements have a section (31.3, 31.4) extending between the first and the second housing parts . comprising a connection housing made of an electrically insulating material and for each electrical conductor of the data transmission cable a connection contact element held by the connection housing, with respectively one insulation displacement contact (31.1) or a piercing contact for contacting the electrical conductor by way of the electrical conductor being moved in a radial wiring direction relative to the plug connection part and with respectively one contact (13.1) for contacting corresponding contacts of a corresponding counterpiece of the plug connection part , wherein each insulation displacement contact (31.1), respectively each piercing contact, is electrically connectable with one of the contacts, wherein the wiring direction of the contact elements of a first group of connection contact elements is opposite to the wiring direction of a second group of contact elements, wherein axially extending connection sections (31.3) of the contact elements of the first group run in a first plane and axially extending connection sections (31.3) of the contact elements of the second group run in a second plane differing therefrom and wherein the connection housing is formed in such a way that the connection contact elements cannot be inserted into the connection housing from an outside, characterised in that the connection housing is composed of at least two housing parts , a first housing part as well as a second housing part of the connection housing supports a plurality of connection contact elements and the connection contact elements have a section (31.3, 31.4) extending between the first and the second housing parts . <EOS>