An alternative approach to connecting asset monitors to the control house is to use existing wires that were laid when the transformer was originally commissioned. Power line carrier is a technology that has been used in protective relaying and demand response applications for decades. It provides fast, secure, and reliable communications across overhead lines. It is a high frequency signal applied on wires that are already carrying DC or fundamental AC currents. Scaling down this technology to a low voltage control wire allows customers to provide broadband speeds across existing wires completely avoiding the cost of trenching. A power line carrier solution can be applied at a fraction of the cost of trenching thereby greatly reducing the cost and labor associated with condition-based monitoring.