Abstract: A broadband optical fiber network for conveying signals between subscriber locations and a head end. A coherent light source is used at the head end to generate signals for transmission to the subscriber locations. Successive groups of downstream optical transmission segments followed by optical separators or splitters carry the coherent light from the head end to the subscriber locations. Non-coherent light sources providing broadband optical signals are situated at the subscriber locations. Successive groups of upstream optical transmissions segments followed by optical combiners carry the broadband optical light signals to the head end.

Abstract: A cutover or reconnection LRD device capable of being remotely controlled has been developed. The cutover or reconnection device consists of a switch under control of a control circuit which can receive tone or other special signals sent remotely, such as via the network from the central office, or via portable devices. In response to those signals, the control circuit changes the state of the switch, thus connecting the subscriber to either the old electric telephone circuit, or the new network circuit. In the below-described preferred embodiments, the latter circuit may be a fiber optic circuit or a broadband or CATV circuit, for example.

Abstract: A fault detection system for a broadband network having a central switch for switched telecommunications connections among subscribers each provided with subscriber interface equipment. The subscriber interface equipment has a received voice path and generates baseband signals for voice telephony which are carried at a carrier frequency on the broadband network. The fault detection system is provided with a tone generator for providing a constant, continuous pilot throughout the network. A pilot tone detector at the subscriber interface equipment detects the absence of pilot tone. The central switch is responsive to each pilot tone detection to recognize the absence of pilot tone at the corresponding subscriber location.