An exemplary heat exchanger includes evaporator channels and condenser channels, connecting parts for providing fluid paths between evaporator channels and the condenser channels, a first heat transfer element for transferring a heat load to a fluid in said evaporator channels, and a second heat transfer element for transferring a heat load from a fluid in the condenser channels. The polycyclic fluoroalkanes are useful as solvents, cleaning agents, heat transfer fluids, refrigerants, lubricants, and, in a preferred embodiment, by virtue of high refractive index and high transparency to UV wavelengths, optical applications in the vacuum ultraviolet. With this, the optical fiber can be accommodated in the groove. A processing chip is provided on the side of the control circuit board that faces the bottom of the chamber. The system provides a way of allowing participants of a conference call to experience the call according to the highest quality codec that their endpoint supports.