Described herein is a system for controlling access to a physical location. In some embodiments, a user device may provide user credentials to an input device of the access system. The input device may transmit the user credentials to a splitter, in some examples, permit access to the physical location via an access control board. In other examples, the input device may transmit the user credentials from a splitter to a network-connected gateway and then permit access to the physical location via the access control board. In either example, the power and signal wires may be reused for the splitter and/or network-connected gateway. The access control board may be coupled with an electrically-controlled device and configured to allow access to the physical location with one or more electronic signals to the electrically-controlled device. The electrically-controlled device may allow access when the user credentials are authenticated by the system.