Systems and methods are provided for reducing outage scope in cable networks with ideal taps. An ideal tap may have a plurality of ports that include at least an input port configured for receiving downstream (DS) signals from and transmitting upstream (US) signals to upstream nodes, an output port configured for transmitting downstream (DS) signals to and receiving upstream (US) signals from downstream nodes, and one or more drop ports for receiving signal from and transmitting signals to customer premise equipment (CPE) in the coaxial network. The ideal tap may further include one or more mitigation components configured for reducing scope of outage in the ideal tap, with the one or more mitigation components configured to, when an outage occurs in the ideal tap, provide or maintain inter-port connectivity within the ideal tap, the inter-port connectivity including at least connectivity between the input port and the output port.

There are provided an optical fiber display system and an optical fiber changeover method each enabling an efficient optical fiber changeover work. The optical fiber display system according to the present invention includes a plurality of core wire identification terminals 101. Each of the core wire identification terminals 101 includes: bent part formation units 11 configured to form a bent part at an optional position of an optical fiber 50 and to leak optical signals propagating through the optical fiber 50 from the bent part; analysis units 12 configured to acquire identification numbers of communication apparatuses (51 and 52) included in the leaked optical signals, the communication apparatuses (51 and 52) being connected to respective ends of the optical fiber 50; a communication unit 13 configured to inquire of a database 201 storing relationship between the optical fiber and the communication apparatuses about the acquired identification numbers of the communication apparatuses, and to receive an identification number of the optical fiber 50 corresponding to the acquired identification numbers of the communication apparatuses, from the database 201; and a display unit 14 configured to display the acquired identification numbers of the communication

An optical network includes an arrangement of optical nodes. An optical node of the arrangement, and corresponding method, perform optical connectivity discovery and negotiation-less optical fiber continuity verification in the optical network. An overall topology of optical connectivity provisioned for the arrangement is discovered by the optical node based on messages received from a management network communicatively coupling the optical nodes to each other. The optical node synchronizes, temporally and sequentially, with the other optical nodes based on the messages received, assigns fiber of the overall topology, based on a verification sequencing method, to verification slots of a verification sequence, and verifies continuity of fiber according to the verification slots of the verification sequence. The discovery, synchronization, and assignment operations enable the optical node and peer node to perform the optical fiber continuity verification in a symmetric, decentralized, and negotiation-less manner.

An apparatus and a method for optically linking at least two AC and DC low voltage cascading power grids connecting at least two intelligent support boxes (ISB) each powered by two distinct AC standard power grid and separately powered by DC low voltage power grid with each grid is further linked by a cascading segments of optical cable grid, enabling two way control, operate and report electrical activity through plug in wiring devices (PWD) for supporting DC and AC plurality of connected/attached loads.

Methods, systems, and apparatuses, among other things, may integrate one or more first alarms reported by routers and Ethernet switches with one or more second alarms reported by reconfigurable optical add/drop multiplexers (ROADMs) and optical transport network (OTN) network elements. Moreover, one or more troubleshooting actions may be performed based on the integrated first alarms and second alarms.

A method of distance synchronization of a series of remote optical receiver points with an optical transmission point, the method including the steps of: (a) sending an optical timing pulse from the optical transmission point to each of the series of remote optical receiver points and back; (b) determining a round trip time of the timing pulse; and (c) storing an indicative measure of the roundtrip time of the timing pulse and utilising the indicative measure to adjust the timing of signals at the remote optical receiver points to determine the relative reception time of signals received by the series of remote optical receiver points.

An optical node device (1aA to 1cA) includes a transmission transponder (27), WSSs (22 to 25), a beam splitter (21), and a monitoring transponder (26). The transmission transponder (27) transmits an optical signal (B1) via an optical path (P3) set in an optical fiber (2). The WSSs (22 to 25) multiplex, on the transmitted optical signal (B1), a monitoring control signal (M1) for performing optical path tracing that is confirmation of conduction along the optical path (P3). The monitoring transponder (26) measures and monitors the optical power of the monitoring control signal (M1) multiplexed into the optical signal (B1) branched by the beam splitter (21), and further monitors whether the monitored optical power is equal to or higher than a predetermined level indicating normality of the optical path (P3).

A plurality of optical sensors (3) are each installed in an optical path control device (1) that controls a corresponding one of the plurality of optical paths (2) without using an electrical element. Each of the plurality of optical sensors (3) detects an optical signal passing through the corresponding one of the plurality of optical paths (2). A transmitter (4) determines a communication state of the corresponding one of the plurality of optical paths (2) based on detection of the optical signal by the corresponding one of the plurality of optical sensors (3), and transmits information on the determined communication state. A power supplying optical signal generation unit (11) generates a power supplying optical signal. An optical signal synthesizing device (12) synthesizes the power supplying optical signal with the optical signal and transmits a signal obtained by the synthesis to the optical path control device (1). A storage battery (13) supplies electric power to the transmitter (1). A photoelectric conversion unit (14) converts the power supplying optical signal branched from the optical signal in the optical path control device (1) into an electrical output and supplies the electrical output to the storage battery (13).

It is possible to allow a user to easily distinguish between an event at a place to be resolved and an event at a place having no problem on a path of a PON communication network to be measured. A light intensity distribution of return light is processed in a time-series order to detect an event at each position on a network. A parameter N1 relating to the total number of splitters present on a path of the network is specified, the number N2 of detections of the total number of splitters detected as an event is recognized, and in a case where “N1>N2”, a last detected event is associated with one optical splitter and is further displayed as an “uncertain splitter” in distinction from a normal splitter.

Disclosed are an apparatus and testing methods for performing testing operations over multiple types of links and through multiple potential points of failure to segment sources of problems, which may relate to reported or actual instances of service disruption in a network communication environment. The apparatus may perform service layer testing directly via an optical link, in addition to via Ethernet service layer testing. The apparatus may further conduct tests on other layers as well, including the physical layer, the network layer, and the link layer. To facilitate efficient testing, the apparatus may integrate programmable workflow profiles that specify tests to be conducted, and may interface with a cloud platform for sharing results of the tests, providing end-to-end testing of various components and types of links (whether optical or electrical, including wired and wireless links). Results of the tests may provide guidance to resolve detected problems.