摘要:
The one-to-plural communication system for realizing the time slot allocation control method of the invention comprises the terminal-side apparatus 800˜830 provided with the buffer 801, the Queue length report function 802, and the output control function 803, and the network-side apparatus 840 provided with the necessary buffer capacity reduction type time slot allocation control function 141. The necessary buffer capacity reduction type time slot allocation control function 141, by using the Queue length information reported from the Queue report function 802, allocates time slots so that Queue lengths in the buffer 801 may become constant as nearly as possible among the terminal-side apparatus 800˜830, and reports the results to the output control circuit 803 which controls the output of cells from the buffer 801. Thus, this invention provides, in dynamic time slot allocation control, a time slot allocation control method for reducing the necessary buffer capacity of each terminal-side apparatus, and also a one-to-plural media shared type communication system for realizing it.
摘要:
A desired speed stage is preselected and at a time when a car speed reaches a speed commensurate with the preselected speed stage, a present speed stage is changed to the preselected speed stage.
摘要:
To provide a steel fuel conveying pipe which has high resistance to corrosive fuel and maintains reliability without damaging a direct-injection engine, and connects a high-pressure pump and a direct-injection rail with each other in a gasoline direct-injection engine system, and a fuel conveying pipe suitable as a bypass pipe for coupling direct-injection rails with each other in a V-type gasoline engine. A steel fuel conveying pipe for conveying gasoline is characterized in that a Ni-plated layer is provided on the whole inner circumferential face of the fuel conveying pipe, and an anti-rust film layer composed of a Zn-plated layer and a Zn-based alloy-plated layer is further provided on the Ni-plated layer at at least one end of the fuel conveying pipe.
摘要:
Provided in the EoE technique are the node, the network, the correspondence relationship generating method and the frame transfer program to avoid traffic concentration on a specific link to improve throughput of the network as a whole by realizing optimum path transfer. The frame switching unit includes the frame analysis unit for analyzing an input frame kind and the like, the table search unit for obtaining frame rewriting information and output port information, the forwarding table storage unit for managing an output port of a frame, the MAC learning unit for executing MAC address learning, the EoE-MAC learning unit for learning a relationship between a MAC address and an EoE-MAC address, the STP control unit for executing processing of a spanning tree, and the like.
摘要:
In a multi-ring network with a plurality of rings to which RPR is applied connected, high-speed failure recovery is enabled when a failure occurs between the rings. The contact nodes 700-1 and 700-3 connected to the living inter-link 505 periodically transmit and receive a KeepAlive signal to/from each other. Then, when a KeepAlive signal fails to arrive for a fixed time period, determination is made that the inter-link 505 develops a fault to broadcast-transmit an inter-link failure notification RPR-MAC frame indicative of failure occurrence on the inter-link to each node. A contact node as a transmission source of the inter-link failure notification RPR-MAC frame and each node having received the inter-link failure notification RPR-MAC frame immediately flush learning contents of their own learning data bases. A contact node connected to the spare inter-link 506 switches the spare inter-link 506 to a forwarding state.
摘要:
An exemplary object of the present invention lies in a point of providing a technology capable of measuring a transmission quality of an Ethernet network in order to utilize Ethernet as carrier-grade communication. The present invention includes an error bit number measurer for measuring the number of error bits that have occurred for a frame of Ethernet, being a target of monitoring, within a monitoring period, a transmitted bit number measurer for measuring the number of total transmitted bits of Ethernet frames that a device facing it has transmitted within the foregoing monitoring period, and a bit error rate operator for obtaining a bit error rate of a transmission path by employing a measurement result by the foregoing error bit number measurer and the foregoing transmitted bit number measurer.
摘要:
In a communication system in which a plurality of communication terminals sequentially transfer data to a server during the respective transmission permissible periods assigned to the respective communication terminals, the communication terminal transfers a preamble for synchronization to the server at a time of starting the transmission permissible period, converts a data frame for every 8 bits into every 10 bit-code, and transmits to the server, the signal string with a code indicating the head added there, during the transmission permissible period, and turns a communication to the server into a zero signal state, during a period other than the transmission permissible period, while the server establishes a synchronization by reading the preamble for synchronization inserted into the signal string received from each of the communication terminals, converts a portion of the zero signal state of the signal string into a predetermined special code string, and inversely transforms the received signal string into the data frame before the coding.
摘要:
A mobile terminal includes a mobile phone function unit, a storing unit, a communication control unit, and a store-and-forward multihop communication function unit. The mobile phone function unit confirms status of connection with a mobile base station and exchanges information with the mobile base station when the status of connection is a connection state. The storing unit stores information received and generated by the mobile phone function unit. The communication control unit receives connection information including the status of connection from the mobile phone function unit and generates a control signal when the connection information indicates a disconnection state. The store-and-forward multihop communication function unit builds a first session with a first mobile terminal after starting in response to the control signal, stores information received from the first mobile terminal and generated information in the storing unit, transmits information stored in the storing unit after building a second session with a second mobile terminal, and stores information received from the second mobile terminal in the storing unit.
摘要:
In a multi-ring network with a plurality of rings to which RPR is applied connected, high-speed failure recovery is enabled when a failure occurs between the rings. The contact nodes 700-1 and 700-3 connected to the living inter-link 505 periodically transmit and receive a KeepAlive signal to/from each other. Then, when a KeepAlive signal fails to arrive for a fixed time period, determination is made that the inter-link 505 develops a fault to broadcast-transmit an inter-link failure notification RPR-MAC frame indicative of failure occurrence on the inter-link to each node. A contact node as a transmission source of the inter-link failure notification RPR-MAC frame and each node having received the inter-link failure notification RPR-MAC frame immediately flush learning contents of their own learning data bases. A contact node connected to the spare inter-link 506 switches the spare inter-link 506 to a forwarding state.
摘要:
An object of the present invention is to provide a technology capable of estimating header conversion applied in a network by collecting information required in the estimation, without introducing a special-purpose server directed to estimate header conversion applied in the network. The present invention provides a system for estimating information about apparatuses on a network using an error message or control message sent in response to a transmitted packet as stipulated by a communication protocol to estimate information about apparatuses on the network.