Methods, apparatuses, and systems for improving utilization of a communications system are provided through techniques referred to herein as \u201cdeltacasting. The pig has a front leading cup and a rear trailing cup adapted to seal with the conduit for propelling the device through the conduit. As the combustion gases expand, the piston’s momentum propels it past the point where the pressure is equal on both sides of the piston. The ash by-product can be disposed of at much less cost or can be incorporated in a variety of applications such as an aggregate substitute. The broken-wire-failure detection circuit also includes the third resistance device connected between the power line and the ground line, and a signal output circuit connected to the second power line, the second signal line and the second ground line. The system is capable to automate unitregression test case preparation, remote execution, provide XML based assert mechanism to evaluate test results, maintenance and versioning.