The invention provides a hybrid arrangement, which allows an existing circuit switched telephony network to be deployed on a packet switched network. In one embodiment, an apparatus, such as a medical device, includes an elongate member and a tissue disrupter. The waveguide is adjacent the source, receives electromagnetic radiation from the source, and delivers the electromagnetic radiation to the biological tissue. The second side of the IDC connector may have multiple covers to minimize the effort required by a field technician to terminate the field-wiring. A cooling liquid is made to flow in the cooling pipe.