Bus network

About: Bus network is a research topic. Over the lifetime, 7017 publications have been published within this topic receiving 97556 citations.

Digital data communication system

Abstract: A digital data communication system including a data source and a source interface, a digital data bus, for transferring encoded information from the data source to one or more receivers, each having a receiver interface. The source interface is adaptable for controlling the rise and fall times of the signals on the bus at a plurality of frequencies. It is directly coupled to the bus and terminates the bus in its characteristic impedance. The receiver interface operates at a plurality of frequencies and is directly coupled to the bus.

Optimization of feeder bus routes and bus-stop spacing

Abstract: Existing studies of transit network design deal separately with the problems of determining the optimal route spacing and operating headway, and that of determining the optimal stop spacing. This paper presents an analytic model for the design of an optimal feeder bus network for accessing an existing rail line, which avoids the sequential approach and combines these three basic variables. Our results with regard to bus‐route spacing and headway are similar to those obtained previously, indicating that route spacing and operating headway are not highly sensitive to changes in the relevant system parameters. With regard to bus‐stop spacing, three different cases are considered, reflecting three different stop‐spacing policies. In the first case, bus‐stop spacing is specified as uniform over the entire area. In the second case, stop spacing is constant along any given route. In the third case, stop spacing may vary both between and along routes. Closed‐form solutions are presented for the first two cases. T...

Port adapter for high-bandwidth bus

Abstract: A port adapter for connecting zero or more network interfaces to a host system having a SPI-4 bus is disclosed. The port adapter comprises zero or more network interfaces; a SPI-4 bus coupled to a host system to provide a communication channel between the host and the network interfaces; a control bus coupled to the host system for controlling and monitoring the port adapter; and interface logic that interfaces the SPI-4 bus and the control bus to the network interfaces. Methods are provided for selecting and using one of a small plurality of different packet formats for various networking technologies, so that the port adapter can hide details of the technology that it handles from the host system, and for operating the host system's SPI-4 bus at one of several speeds based on bandwidth requirements of the port adapter.

Cordless accessed high-speed high-capacity local area networks

Abstract: The present invention relates to a high-speed high-capacity Local Area Network (LAN) wherein each user, of a separate group of one or more of the network users, communicates cordlessly, using radio frequencies or infrared, with an assigned Regional Bus Interface Unit (RBIU) located in the proximity of the group. Each RBIU of the network interfaces with a high-speed serial or lower speed parallel bus of an open-ring network for purposes of transmitting information signals while receiving information signals via the high-speed serial network bus (es), Various communications protocols such as, for example, CSMA/CD, slotted ALOHA, etc. can be employed by the users in communicating with the associated RBIUs with high efficiency due to the short paths involved relative to the transmission frame durations used on the bus.

A Parallel Ant Colony Algorithm for Bus Network Optimization

Abstract: This paper presents an optimization model for a bus network design based on the coarse-grain parallel ant colony algorithm (CPACA). It aims to maximize the number of direct travelers/unit length; that is, direct traveler density, subject to route length and nonlinear rate constraints (ratio of the length of a route to the shortest road distance between origin and destination). CPACA is a new optimal algorithm that 1) develops a new strategy to update the increased pheromone, called Ant-Weight, by which the path-searching activities of ants are adjusted based on the objective function, and 2) uses parallelization strategies of an ant colony algorithm (ACA) to improve the calculation time and the quality of the optimization. Data collected in Dalian City, China, is used to test the model and the algorithm. Results show that the optimized bus network has significantly reduced transfers and travel time. The data also reveals that the proposed CPACA is effective and efficient compared to some existing ant algorithms.