Function module for data transmission for an elongated light strip luminaire, the function module comprising: - an active data coupling unit for transmitting user data via a data line; - fastening means for mounting the function module on or in an elongated supporting profile of a light strip luminaire, in particular on the underside of an access opening of the supporting profile and/or at least partially in the supporting profile; characterized in that the active data coupling unit has at least one first data interface for optical data transmission via a POF optical waveguide, in particular via a conductor pair of POF optical waveguides, and at least one further data interface, in particular a second data interface for optical data transmission via POF optical waveguides, in particular via a conductor pair of POF optical waveguides, and/or a second data interface for ETHERNET data transmission, that the function module comprises a device carrier to which the active data coupling unit is fastened, the device carrier having the fastening means and being designed for detachable fastening to a support profile of an elongated light strip luminaire of the light strip system, in particular on the underside of the support profile, and that the functional module comprises a contact device for connection to predetermined conductors of an electrical supply running in the support profile of the light strip luminaire, and the active data coupling unit can be connected to the supply by means of the contact device for the purpose of power supply, and that the fastening means and the contact device are designed in such a way that when mechanically fastened to the support profile, electrical contact is also made with the supply at the same time. - an active data coupling unit for transmitting user data via a data line; - fastening means for mounting the function module on or in an elongated supporting profile of a light strip luminaire, in particular on the underside of an access opening of the supporting profile and/or at least partially in the supporting profile; that the active data coupling unit has at least one first data interface for optical data transmission via a POF optical waveguide, in particular via a conductor pair of POF optical waveguides, and at least one further data interface, in particular a second data interface for optical data transmission via POF optical waveguides, in particular via a conductor pair of POF optical waveguides, and/or a second data interface for ETHERNET data transmission, that the function module comprises a device carrier to which the active data coupling unit is fastened, the device carrier having the fastening means and being designed for detachable fastening to a support profile of an elongated light strip luminaire of the light strip system, in particular on the underside of the support profile, and that the functional module comprises a contact device for connection to predetermined conductors of an electrical supply running in the support profile of the light strip luminaire, and the active data coupling unit can be connected to the supply by means of the contact device for the purpose of power supply, and that the fastening means and the contact device are designed in such a way that when mechanically fastened to the support profile, electrical contact is also made with the supply at the same time.