Bidirectional communication method and device for point-to-multipoint network

Abstract

The invention is suitable for the bidirectional communication of a point-to-multipoint network, and provides a bidirectional communication method and device for the point-to-multipoint network. The method comprises the steps: dividing the widths, safety interval and the number of time windows in a meter collecting and reading network or monitoring network; selecting a downlink broadcast window and an uplink broadcast window according to the widths, safety interval and the number of time windows; enabling the selected downlink broadcast window as the time window of SPEAKER, and enabling the selected uplink unicast window to serve as the time window of a terminal LISTENER; transmitting data according to the time window of the SPEAKER and the time window of the LISTENER, and completing the bidirectional communication of the meter collecting and reading network or monitoring network, wherein the meter collecting and reading network or monitoring network employs a network topology structure in the EPON / GPON communication technology. The method employs a mode of time division multiplexing for achieving bidirectional communication, provides higher communication efficiency and large bandwidth, can quickly locate a fault point, isolates a single-point fault, and reduces the maintenance workload.

Description

technical field [0001] The invention belongs to the field of two-way communication of point-to-multipoint network, in particular to a method and device of two-way communication of point-to-multipoint network. Background technique [0002] In applications such as industrial monitoring, power monitoring, and remote centralized reading of smart meters, a large number of RS485 bus technologies are used. This technology uses copper wires for communication, and there are many problems, such as being susceptible to interference, low communication speed, and single point failures that will lead to The entire network communication is interrupted, and it is difficult to locate after a fault. [0003] The traditional RS485 bus technology can no longer meet the application requirements, and the point-to-multipoint network topology of EPON technology and GPON technology has many advantages, especially suitable for the above-mentioned business applications. However, under such applicatio...

AI Technical Summary

Problems solved by technology

[0005] 1. The technology is complex, the performance requirements are high, and expensive special chips are required to realize

[0006] Second, complex dedicated chips lead to high network costs and high power consumption, which is completely impractical for industrial / power monitoring and centralized copying services, and the economy is too poor

[0007] 3. Huge bandwidth is very uneconomical for small traffic applications

[0008] 4. Complicated technology leads to complex operation and maintenance, high requirements for operation and maintenance skills, and high maintenance costs

[0009] To sum up, the current network topology of EPON / GPON communication technology cannot be directly applied to the above-mentioned monitoring and centralized copying network

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