The invention relates to an instrument system for pedicle screws having a thread in their head which has a clamping screw in the direction of their screw axes, which can be actuated by a power screw driver, with holders for the absorbing of a torque contacting the head of the pedicle screw in a shape matched manner. A substrate having a pad oxide and a pad nitride is provided. The housing is provided with a second set of passages for fixing screws, whereby the axes thereof are perpendicular to those of the first set of passages for the screws which are provided for fixation of the housing in an upright position on the surface of the support. The ingress edge units receive the optical data packets from the data links and aggregate the optical data packets into super packets where each super packet is to be routed to a particular destination egress edge unit.