Stateless deterministic network address translation within a service provider network is described. The apparatus obtains an effective time-series signal by removing, from an output time-series signal of the vital sign sensor, a first time-series signal and a second time-series signal, the first time-series signal corresponding to a time period of a non-contact state and a second time-series signal corresponding to a time period of an unstable state. Removable fasteners corresponding to pre-drilled holes in the main compartment of the switch are used to secure the door and hood to the main compartment of the switch, permitting a user to easily remove them if the switch is to be mounted on the interior of a structure. The receiving channel is configured to receive the seat frame.