the embodiment 150 of provides power to the local transceiver loads when mains 60 power fails and the power supply 120 and or the optional battery 130 provide no or insufficient power if the internal transceiver loads are different from or require conditioning or regulation the power received from the connectors 112 a 112 d via the isolators 116 a 116 d are accordingly converted or processed by the poe receptor 152 and or power supply 120 the ac power receptacles 140 a 140 d are shown connected via optional lpfs 142 a 142 d to the mains power outlet 80 a via connector 102 although shown without some of the feature e g the connection to the ups 62 directly or via the controlled switch 124 of the embodiment 100 of fig2 such features may be added entirely or in part according to the teaching of the present invention by one of ordinary skill in the art alternate embodiments foresee the application of the features of the present invention to systems including a power line conditioner not shown and or other devices in place of or in addition to serially inserted the connection between the cord 122 and the outlet 80 b moreover the outlets 140 a 140 d may be co.