Method and device for processing network and storage related traffic is provided. The method and apparatus provide a nearly constant power supply current load on the test power supply, and a nearly constant thermal load on the cooling system. A first cylindrical lens is disposed to collimate light from the fast planes of the diodes. A mechanical displaceable element co-operates with the torsion bar arrangement such that, when the element is in a parked position, the element engages the torsion bar arrangement to cause the capping member to be displaced into abutment with the printhead to cap the printhead.