mvb bus repeater

Abstract

The invention provides an MVB repeater. The MVB repeater comprises a shell and a circuit board card fixed in the shell; the circuit board card comprises two channel circuits, which are redundant with each other and independent; each channel circuit comprises a first MVB signal driving and receiving circuit, a second MVB signal driving and receiving circuit, a power supply conversion module and an FPGA module; the first MVB signal driving and receiving circuit, the second MVB signal driving and receiving circuit and the FPGA module are respectively connected to the power supply conversion module; one end of the first MVB signal driving and receiving circuit is connected with a first segment MVB; the other end of the first MVB signal driving and receiving circuit is connected with one end of the FPGA module; one end of the second MVB signal driving and receiving circuit is connected with the other end of the FPGA module; the other end of the second MVB signal driving and receiving circuit is connected with a second segment MVB; the FPGA module receives an MVB signal from one of the first segment MVB and the second segment MVB; and, after being conditioned, the MVB signal is forwarded to the other one of the first segment MVB and the second segment MVB. The MVB repeater disclosed by the invention has high reliability.

Description

technical field [0001] The invention relates to the technical field of train communication, in particular to an MVB (Multifunction Vehicle Bus, multifunctional vehicle bus) bus repeater. Background technique [0002] In the train communication network standard based on IEC61375, the vehicle-level bus mostly uses the multifunctional vehicle bus MVB to connect the same vehicle or the bus equipment in the same formation. The transmission medium of the MVB bus is divided into three types: electrical short-distance ESD, electrical middle-distance EMD, and optical fiber. In practical applications, electrical middle-distance medium EMD is mostly used. The physical layer of medium-distance EMD is driven by RS-485, and the cable is a shielded twisted pair. Due to the attenuation of the signal as the length of the cable increases and the limitation of RS-485 receiving capacity, the MVB cable under the medium-distance EMD medium The length cannot exceed 200 meters, which seriously aff...

AI Technical Summary

Problems solved by technology

The physical layer of medium-distance EMD is driven by RS-485, and the cable is a shielded twisted pair. Due to the attenuation of the signal as the length of the cable increases and the limitation of RS-485 receiving capability, the MVB cable under the medium-distance EMD medium The length cannot exceed 200 meters, which seriously affects the communication application of MVB bus

In order to break this transmission limitation, the standard recommends the use of MVB repeaters to increase the transmission distance of signals, and stipulates that MVB repeaters belong to category 0 equipment, that is, only realize signal regeneration and amplification, and do not have data communication capabilities

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