According to one or more embodiments of the disclosure, a particular networking device joins a ring network of networking devices that has a ring topology. The particular networking device monitors the ring network for a multicast frame used within the ring network to detect link failures. The particular networking device determines that a link in the ring network has failed, based on the particular networking device not receiving the multicast frame within a threshold amount of time. The particular networking device initiates repair of the ring network, when the particular networking device determines that the link in the ring network has failed.

According to one or more embodiments of the disclosure, a particular networking device joins a ring network of networking devices that has a ring topology. The particular networking device monitors the ring network for a multicast frame used within the ring network to detect link failures. The particular networking device determines that a link in the ring network has failed, based on the particular networking device not receiving the multicast frame within a threshold amount of time. The particular networking device initiates repair of the ring network, when the particular networking device determines that the link in the ring network has failed.

A flexible test arrangement for performing measurements on a test object. A plurality of safety components, each having a safety module which can be set to active or inactive, and having a ready status which can be set to active or inactive, is provided in a circular test arrangement. Each of the safety components carries out a number of function tests cyclically. As one of the function tests, a cyclical, error-free reception of a data packet is tested. One of the safety components is selected as a bus master which cyclically transmits a bus verification signal in a data packet to the safety component which is adjacent in the direction of transmission, wherein the bus verification signal is relayed by each of the safety components in a data packet, and, when said bus verification signal is received in a data packet, the bus master determines that the circular test arrangement is closed.

An apparatus and method for operating a ring interconnect are disclosed. The ring interconnect has a plurality of nodes that are used to connect to associated components, and is arranged to transport a plurality of slots around the ring interconnect between the nodes in order to transfer items of traffic allocated into those slots between components connected to the nodes. For each item of traffic, one of the components acts as a source to allocate that item of traffic into a slot, and another components acts as destination to seek to remove that item of traffic from the slot. In a default mode of operation, the ring interconnect is arranged to allow all of the slots to be available for transfer of any items of traffic. Special slot management circuitry is provided that is responsive to a throughput alert trigger indicating a potential for occurrence of a throughput inhibiting condition, to cause a slot amongst the plurality of slots to be reserved as a special slot that is constrained for use only when one or more determined conditions are met. Further, the one or more determined conditions are arranged to cause the special slot to be used in a manner that seeks to avoid the throughput inhibiting condition arising.

A plurality of slaves include a first slave constituting the start and end points of a ring wiring and a plurality of second slaves connected between the start and end points, the ring wiring being capable of configuring a first path via which the second slaves cause data accepted from the start point side to be cyclically transferred to the end point side, and a second path for each slave to loop back the data from the device itself when the path between the slave and an adjacent slave is cut off disconnected. When the path is recovered from the disconnection, a master transmits a command for switching the second path to the first path to the slave that carries out the loopback, and sends out data after the elapse of a time based on a propagation delay time from the time of this transmission.

A plurality of slaves include a first slave constituting the start and end points of a ring wiring and a plurality of second slaves connected between the start and end points, the ring wiring being capable of configuring a first path via which the second slaves cause data accepted from the start point side to be cyclically transferred to the end point side, and a second path for each slave to loop back the data from the device itself when the path between the slave and an adjacent slave is cut off disconnected. When the path is recovered from the disconnection, a master transmits a command for switching the second path to the first path to the slave that carries out the loopback, and sends out data after the elapse of a time based on a propagation delay time from the time of this transmission.

A computing device for managing a security system is disclosed. The computing device includes one or more processors. In some embodiments, the one or more processors can receive a number of events occurring in one or more of a number of polling loop networks. The events are monitored by a control device. The one or more processors can determine whether an occurrence frequency of the events exceeds a first threshold, where the occurrence frequency is defined as a number of the events divided by a period of time during which the events occurred. The one or more processors can in response to determining that the occurrence frequency exceeds the first threshold, automatically notify a user of the security system via a web application.

A computing device for managing a security system is disclosed. The computing device includes one or more processors. In some embodiments, the one or more processors can receive a number of events occurring in one or more of a number of polling loop networks. The events are monitored by a control device. The one or more processors can determine whether an occurrence frequency of the events exceeds a first threshold, where the occurrence frequency is defined as a number of the events divided by a period of time during which the events occurred. The one or more processors can in response to determining that the occurrence frequency exceeds the first threshold, automatically notify a user of the security system via a web application.

A communication device with an activated ring controller provided in both first and second subnetworks for data transmission in a redundantly operable communications network, which includes at least one first and one second subnetwork, which each include communication devices interconnected within a ring topology, wherein the subnetworks are interconnected via coupling line sections to which coupling communication devices are connected, where the coupling line section to which a selected coupling communication device is connected is operated as an inactive reserve coupling line section until a disruption occurs, whilst another coupling line section is operated as an active main coupling line section, where coupling communication devices connected to the main coupling line section transmit status datagrams to the selected coupling communication device which additionally include configuration information about whether the particular coupling communication device connected to the main coupling line section is an activatable ring controller.

A communication device with an activated ring controller provided in both first and second subnetworks for data transmission in a redundantly operable communications network, which includes at least one first and one second subnetwork, which each include communication devices interconnected within a ring topology, wherein the subnetworks are interconnected via coupling line sections to which coupling communication devices are connected, where the coupling line section to which a selected coupling communication device is connected is operated as an inactive reserve coupling line section until a disruption occurs, whilst another coupling line section is operated as an active main coupling line section, where coupling communication devices connected to the main coupling line section transmit status datagrams to the selected coupling communication device which additionally include configuration information about whether the particular coupling communication device connected to the main coupling line section is an activatable ring controller.