CN202602694U - Physical-isolation Ethernet switch - Google Patents

Abstract

A physically isolated Ethernet switch of the present utility model comprises two groups of communication ports with the same component type and connection mode, a wavelength division multiplexing multiplexing module, a wavelength division multiplexing demultiplexing module and an optical fiber interface, and each group of communication ports is composed of The processor is connected with flash memory and static memory to form a central processing module, which is used to manage and configure the switching chip. The Ethernet interface chip is connected to the twisted-pair network interface through the network port transformer, and the Gigabit Ethernet interface chip is connected to the optical module through the switching switch. The utility model realizes complete physical isolation of business data in different groups during exchange and transmission without increasing network equipment, which greatly reduces equipment cost, simplifies network wiring, and facilitates management and maintenance .

Description

Physically isolated Ethernet switch

technical field

The utility model relates to a physically isolated Ethernet switch.

Background technique

The distribution grid is an important channel for the distribution and use of electric energy, and it is an important part of the grid. The distribution grid communication network is an information channel to ensure the normal operation of the distribution grid, fast response to faults, efficient use of resources, real-time business realization, and sustainable power production. With the progress of smart grid construction, the communication system of the distribution grid needs to solve the access problems of more business information, including advanced distribution automation, power consumption information collection, distributed power access, intelligent interactive power consumption, three networks services such as fusion and video/environmental monitoring. The communication network of the traditional power distribution grid is generally built independently according to the business division, and a large amount of money has been invested in the communication system, especially the investment in the optical fiber communication system is even greater. The communication networks of so many different services bring a huge amount of operation and maintenance and management problems.

Service network integration is the development trend of smart distribution grids, which can avoid redundant construction of communication networks, realize effective data utilization, and improve network efficiency. According to the safety protection regulations of the electric power secondary system, these businesses of the smart distribution grid belong to the production control area and the management information area, and the integration of physical isolation between these areas must be achieved. Due to its own characteristics, the huge distribution grid cannot build a dispatching data network and an integrated data network to meet different types of services to bear the same as the main network. At the same time, the environment of the communication equipment for the distribution grid is different from that of the substation. Some are in the ring main unit, some are on the side of the switch on the pole, and some are in the power distribution room. In these open environments, it is necessary to consider external malicious attacks on the communication network, data interception and other intrusion behaviors.

In order to realize the physical isolation between various services at the communication level, the current practice is to place two communication devices at the distribution network site, and the two types of services are connected separately. Although this method achieves physical isolation, it requires dual-network and dual-device wiring, which not only increases a lot of costs, but is also not conducive to installation, maintenance and management.

Contents of the invention

The purpose of the utility model is to provide a physically isolated Ethernet switch with low equipment cost, simple network wiring, and convenient management and maintenance.

The physically isolated Ethernet switch of the utility model includes two groups of communication ports with the same component type and connection mode, a wavelength division multiplexing multiplexing module, a wavelength division multiplexing demultiplexing module and an optical fiber interface, and each group of communication ports includes a processor , flash memory, static memory, switch chip, 100M Ethernet interface chip, Gigabit Ethernet interface chip, switch, optical module, network port transformer, twisted pair interface, processor, flash memory, and static memory are connected to form a central processing module , used to manage and configure the switching chip, process data information, the switching chip is connected to the processor, and is connected with the 100M Ethernet interface chip and the Gigabit Ethernet interface chip to form a switching module, which is used for the exchange of data within the group, 100M The Ethernet interface chip is connected to the twisted pair network interface through the network port transformer to form a local port module, which is used to connect the terminal or the lower layer equipment. The Gigabit Ethernet interface chip is connected to the optical module through a switch to connect to the uplink port; WDM The multiplexing and multiplexing module will combine the optical carrier signals of different wavelengths sent from the optical module through the multiplexer, and couple them into one optical fiber, and transmit them through the optical fiber interface. The wavelength division multiplexing and demultiplexing module will The light wave signal received from the optical fiber interface is separated into light wave signals of different wavelengths by a wave splitter, and then converted into an electrical signal by an optical module and transmitted to the Gigabit Ethernet interface chip, and the Gigabit Ethernet interface chip then sends the electrical signal to the switch The chip is forwarded to the local end device.

In the physically isolated Ethernet switch of the utility model, the optical module and the Gigabit Ethernet interface chip are connected through a switch, and the switch is operated through a control button, so as to quickly realize the connection between two groups of ports without changing the connection of the terminal equipment. Interchange, which realizes the complete physical isolation of business data in different groups in exchange and transmission without adding network equipment or changing the wiring topology. Only one device is required for a site, and only one network topology is required for outreach to achieve physical isolation, which greatly reduces device costs, simplifies network wiring, and facilitates management and maintenance.

Description of drawings

Fig. 1 is the functional block diagram of the utility model;

Figure 2 is a signal connection diagram of the wavelength division multiplexing module.

Detailed ways

Referring to Figure 1, a group A processor of a physically isolated Ethernet switch is connected to flash memory and static memory to form a central processing module, which is used to manage and configure the switching chip, and process some data information; the switching chip is connected to the processor and connected to hundreds of The Gigabit Ethernet interface chip and the Gigabit Ethernet interface chip are connected to form a switch module for data exchange within the group; the 100M Ethernet interface chip is connected to a twisted pair interface (RJ45 port) through a network port transformer to form a local port module. It is used to connect terminals or lower-layer equipment; the Gigabit Ethernet interface chip is connected to the optical module through a switch, and is used to connect to the uplink port. The component types and connection methods of Group B of the physically isolated Ethernet switches are the same as those of Group A.

Ports in group A are used to connect network devices such as terminal equipment or downlink switches that implement a certain service, and ports in group B are used to connect other types of terminal equipment or network devices such as downlink switches that need to be isolated from the services of group A. The uplink port is a fiber optic interface, which is used to interconnect with a remote physically isolated Ethernet switch. The data of the terminal devices in each group can be exchanged and forwarded through the switching chips in the group, but the data between different groups cannot be exchanged, and can only communicate with the remote physical isolation switch through the uplink port.

The data of the terminal equipment connected to each group port is sent to the switch chip in the group through the 100M Ethernet interface chip, and the switch chip forwards the data to the Gigabit Ethernet interface chip, and the Gigabit Ethernet interface chip converts the data into The differential output signal is defined as Group A Signal_out+/- and Group B Signal_out+/-, and the two groups of Signal_out+/- are sent to the optical module through the switch, and then the differential signal is converted into a light wave signal through the optical module, and the group A optical module is converted into The wavelength of the light wave is 1550nm (λ1), and the wavelength of the light wave converted by the group B optical module is 1310nm (λ3). The light wave signals (λ1, λ3) of two wavelengths are merged together through the wavelength division multiplexing module, coupled into an optical fiber, and finally sent out through the optical fiber interface.

When the remote device sends data to the local terminal device, the wavelength division multiplexing and demultiplexing module demultiplexes the light wave signal in the optical fiber, separates the light wave signal of 1550nm (λ2) and 1310nm (λ4) wavelength, and sends the 1550nm light wave signal For group A optical module, the 1310nm light wave signal is sent to group B optical module, and the optical module converts the optical signal into a differential electrical signal, which is defined as Group A Signal_in+/- and Group B Signal_in+/-, and the two groups of Signal_in+/- pass After the switch is switched, it is sent to the Gigabit Ethernet interface chip, and then the interface chip is sent to the switching chip, and then the switching chip forwards the data to the local terminal equipment.

Refer to Figure 2 for the connection mode of the wavelength division multiplexing module and the transmission direction of the light wave signal. The local port A group can only communicate with the remote A group port device, and the local B group port device can only communicate with the remote Group B port device communication, if the local B group port device needs to communicate with the remote A group port device, it can be realized by controlling the switching switch. The utility model uses two four-way high-speed electronic analog switches as The switch is controlled by a lock button. The A terminal of the analog switch is connected to the optical module. The output differential electrical signal of the optical module is defined as RX+/-, and the input differential electrical signal is defined as TX+/-. The B1 and B2 terminals of the analog switch Connect with the signal_out+/- and signal_in+/- signals of the Gigabit Ethernet interface chip respectively. When the button is released, the switch connects the optical module of Group A with the Gigabit Ethernet interface chip of Group A, and connects the optical module of Group B with the Gigabit Ethernet interface chip of Group B; when the button is pressed, the switch connects the optical module of Group B The optical module is connected with the Gigabit Ethernet interface chip of Group A, and the optical module of Group A is connected with the Gigabit Ethernet interface chip of Group B. At this time, the local port device of Group A can only communicate with the remote B port device, and the local Group B port devices can only communicate with remote A port devices.

Claims (1)

1. A physically isolated Ethernet switch, comprising two groups of component types and identical communication ports of connection mode, wavelength division multiplexing multiplexing module, wavelength division multiplexing demultiplexing module and optical fiber interface, characterized in that: each group of communication Ports include processor, flash memory, static memory, switch chip, 100M Ethernet interface chip, Gigabit Ethernet interface chip, switch, optical module, network port transformer, twisted pair interface, processor and flash memory, static memory connection It forms a central processing module, which is used to manage and configure switching chips, and process data information. Switching, the 100M Ethernet interface chip is connected to the twisted pair network interface through the network port transformer to form a local port module, which is used to connect the terminal or the lower layer equipment, and the Gigabit Ethernet interface chip is connected to the optical module through the switch to connect the uplink Port; the wavelength division multiplexing multiplexing module combines the optical carrier signals of different wavelengths sent from the optical module through the multiplexer, and couples them into one optical fiber, and transmits them through the optical fiber interface. The module separates the light wave signal received from the optical fiber interface into light wave signals of different wavelengths through the wave splitter, and then converts the light wave signal into an electrical signal through the optical module and transmits it to the Gigabit Ethernet interface chip. The Gigabit Ethernet interface chip then transmits the electrical signal Send it to the switch chip and forward it to the local terminal device.

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