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.