An apparatus at a weaving machine serves for the protection of persons in danger regions which extend about a beat-up edge along a weaving width and beyond the latter. In one embodiment, the first network device can estimate beamforming parameters to be used for transmitting the data signal to a first receive port of the second network device and for generating a null signal at a second receive port of the second network device, so that the second network device does not receive the data signal at the second receive port. The insertion device has an indicating mark for indicating quantity of the injected lubricant. The link between the clamp and actuator retracts the clamp permitting the elongate member to be detached from the assembly. This allows for expedited technology insertion into existing optical communications networks, including terrestrial and space-based optical networks.