Abstract: A network device includes a memory, a memory access circuit, and a processor. The memory is configured to store a hash table for accessing a database of network addresses, the hash table including multiple buckets, each bucket dimensioned to store entries for up to a maximal permitted number of the network addresses. The memory access circuit is configured to receive a network address, to calculate a hash value over at least the network address by applying a hashing scheme selected from among a plurality of hashing schemes, to choose a bucket of the hash table based on the hash value, and to access information in the database pertaining to the network address by accessing the selected bucket. The processor is configured to select the hashing scheme to ensure that none of the buckets will be mapped to more than the maximal permitted number of the network addresses.

Abstract: An apparatus for data communication includes a sensor-transceiver and control logic. The sensor-transceiver is coupled to a sensor and connects by an Ethernet link of a communication network in a vehicle to a processor-transceiver that is coupled to a processor. In an upstream direction from the sensor-transceiver to the processor-transceiver, the sensor-transceiver transmits data to the processor-transceiver over the Ethernet link at an upstream data rate, and in a downstream direction from the processor-transceiver to the sensor-transceiver, receives data from the processor-transceiver over the Ethernet link at a downstream data rate. The control logic is configured to select the upstream data rate for communication in the upstream direction to be higher than the downstream data rate for communication in the downstream direction when operating in a first mode, and to select the upstream data rate to be lower than the downstream data rate when operating in a second mode.

Abstract: The present disclosure relates to an improved vehicle data communications network comprising controllers configured in accordance with a Service-Oriented Architecture, arranged to offer available services as subscription service on the vehicle data communications network. In particular, a controller for an automotive data communications network in a vehicle is disclosed. The controller may be operatively connected in use to a data bus and to a high-speed data communications channel. The data bus may comprise at least one first electronic device connected to it. The controller may comprise a first input, a processor, a second input and an output. The first input may be configured in use to receive a first data message from the data bus, the first data message comprising data associated with at least one first electronic device. The processor may be configured in use to identify at least one service associated with the received first data message.

Abstract: A method of configuring an automotive data communications network and a controller for the automotive data communications network are disclosed. The automotive data communications network comprises first and second controllers, each controller being operatively connected in use to a data bus and to a high-speed data communications channel. Each data bus is operatively connected to one or more electronic devices. The method comprises receiving a first data message over the high-speed data communications channel at the first controller; determining a network address associated with the second controller in dependence on the received first data message; and outputting a second data message from the first controller over the high-speed data communications channel, the second data message enabling the second controller to determine a network address associated with the first controller.

Abstract: A data communication method for a data communications network within a vehicle, the data communications network comprising a service-oriented architecture, can include initiating a timer at a first controller located within the data communications network upon receipt of a first data message, the first data message comprising a request for a service from a second controller. The method can also include determining if a second data message from the second controller is received at the first controller within a first period of time that is less than or equal to a first predetermined threshold time period. The method can also include outputting a control signal enabling the requested service to be performed based on the first period of time being less than or equal to the first predetermined threshold time period.

Abstract: A method of configuring an automotive data communications network and a controller for the automotive data communications network are disclosed. The automotive data communications network comprises first and second controllers, each controller being operatively connected in use to a data bus and to a high-speed data communications channel. Each data bus is operatively connected to one or more electronic devices. The method comprises receiving a first data message over the high-speed data communications channel at the first controller; determining a network address associated with the second controller in dependence on the received first data message; and outputting a second data message from the first controller over the high-speed data communications channel, the second data message enabling the second controller to determine a network address associated with the first controller.

Abstract: The present disclosure relates to an improved vehicle data communications network comprising controllers configured in accordance with a Service-Oriented Architecture, arranged to offer available services as subscription service on the vehicle data communications network. In particular, a controller for an automotive data communications network in a vehicle is disclosed. The controller may be operatively connected in use to a data bus and to a high-speed data communications channel. The data bus may comprise at least one first electronic device connected to it. The controller may comprise a first input, a processor, a second input and an output. The first input may be configured in use to receive a first data message from the data bus, the first data message comprising data associated with at least one first electronic device. The processor may be configured in use to identify at least one service associated with the received first data message.

Abstract: Examples of local communication systems are disclosed, based on a ring of point-to-point links, providing for transport of fixed rate synchronous, fixed rate asynchronous data and variable rate data in a flexible format. Different segments of the ring network can carry data at different bit rates, while remaining synchronised to a common frame rate and having a common control channel structure, for compatibility with earlier systems. Parallel channels are provided, either permanently or when required, for signalling errors of source data, data validity/padding, flow control. Parallel variable width channels are defined with free content (stream or packet). Null data symbols are defined for padding on a byte-by-byte basis. The allocation of capacity among variable width channels is revised block by block, and a transition period is defined to allow for ring latency.

Abstract: Examples of local communication systems are disclosed, based on a ring of point-to-point links, providing for transport of fixed rate synchronous, fixed rate asynchronous data and variable rate data in a flexible format. Different segments of the ring network can carry data at different bit rates, while remaining synchronized to a common frame rate and having a common control channel structure, for compatibility with earlier systems. Parallel channels are provided, either permanently or when required, for signalling errors of source data, data validity/padding, flow control. Parallel variable width channels are defined with free content (stream or packet). Null data symbols are defined for padding on a byte-by-byte basis. The allocation of capacity among variable width channels is revised block by block, and a transition period is defined to allow for ring latency.

Abstract: In a connector, an optical fibre cable is passed through a sub-assembly comprising a crimp body and collet. Then a sub-assembly comprising a threaded shell and ferrule is screwed onto the collet so that its tines are compressed in the ferrule onto the buffer coating of the cable at a location behind an end portion from which the buffer coating has been removed. Thus, the optical fibre passes through a precision hole for its projecting end to be removed by a cleaving blade passed across a slot. Two connectors are fixed to opposite ends of a rigid coupler by coupling nuts to bring opposed fibres into register.