An image processor includes a zoom lens for performing optical zooming by moving in a first range, an imaging unit for converting an object image obtained via a zoom lens into an image signal, and an electronic zooming unit for performing an electronic zooming operation on the image signal. As this cable plant was deployed in a tree and branch topology, data transmissions may be susceptible to noise, variable transmission loss and frequency dispersion, particularly in the upstream direction. A standby receiver receives, from the standby transmission system, a status signal indicating an operating state of the active transmission system detected by the remote network node. A second command is generated by the control circuitry on the received first command.