CN117278498A

CN117278498A - Dual redundancy Ethernet switching system based on SpaceVPX architecture

Info

Publication number: CN117278498A
Application number: CN202311076925.XA
Authority: CN
Inventors: 吴侃侃; 李林伟; 汪少林; 王驰; 侯蕾; 陈议
Original assignee: Shanghai Institute of Satellite Engineering
Current assignee: Shanghai Institute of Satellite Engineering
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2023-12-22

Abstract

The utility model provides a dual-redundancy Ethernet switching system based on a SpaceVPX framework, which comprises a switching unit formed by two main and standby redundancy switching modules with the same function, and a switching system formed by a plurality of switching units; the exchange modules are divided into two types, namely a backboard exchange module and a regional exchange module, wherein the external Ethernet interface of the backboard exchange module is mainly led out through a backboard connector, and the external Ethernet interface of the regional exchange module is mainly led out through an external connector; the switching unit formed by the back board switching modules is usually inserted into a stand-alone unit of the spaceVPX architecture, and the Ethernet interface led out through the back board connector is connected with the back board Ethernet interface of each functional module in the stand-alone unit. The utility model realizes unified design of backboard interconnection exchange and local area network interconnection exchange by adopting the SpaceVPX architecture based on the integration transmission of backboard interconnection and local area network interconnection of Ethernet technology, improves the functional density and reduces the resource expense.

Description

Dual redundancy Ethernet switching system based on SpaceVPX architecture

Technical Field

The utility model relates to the technical field of satellite-borne electronic equipment, in particular to a dual-redundancy Ethernet switching system based on a SpaceVPX architecture.

Background

From the Internet, to the sensing network, the Internet of vehicles and the Internet of things, to the ubiquitous network, a ubiquitous network architecture for constructing direct communication among people, things and things becomes a future technical social form. The basic network technology is one of key technologies for constructing ubiquitous interconnection, and Ethernet is the most common communication protocol standard in the existing local area network nowadays, 12 months in 1982, and IEEE802.3 releases. The transmission rate is from ten megabytes, hundred megabytes and gigabytes, the Ethernet technology is developed, the rate is increased in order of magnitude, and the application field is widened continuously. The Ethernet transmission rate is high, the topology structure is flexible, the technical support is rich and the upgrading is easy, so that the Ethernet transmission rate is not approximate, and the Ethernet technology is based on the transformation applicable to the application environment of the Ethernet transmission rate, namely the industrial field bus, the new energy automobile electric control system and the avionic system. At present, the spacecraft developed in China does not adopt the Ethernet technology on a large scale, and particularly, the traditional control bus is still adopted as a backbone network in safety critical occasions. Application verification of ethernet technology has been developed in some systems by the aerospace united states represented by NASA and ESA.

The SpaceVPX VITA78 specification (American National Standards Inst itute ANSI/VITA 78.00-2015) is the first open standard specially developed for space application, and is widely applied to embedded systems with high-performance computing power, excellent interoperability and expandability based on the OpenVPX standard. The management plane, control plane, data plane, expansion plane implement the interconnection of the spaceVPX modules. The Ethernet communication technology can be used for controlling plane communication, providing higher-rate data transmission, assisting with an RS422 interface for managing the plane communication, and realizing module configuration management, health state management and the like. The Ethernet switch developed based on the SpaceVPX architecture can be used as a control plane to realize data exchange between modules in a single machine, and can also realize data exchange between different single machines.

From the cross-domain development of interconnection technology, the interconnection technology in different fields such as industrial field buses, device internal interconnection, on-board interconnection and the like is continuously upgraded and optimized in the respective fields, and meanwhile, the application field is expanded. The electronic system is used as an important information processing and service system of the satellite, and each functional module in each stand-alone machine is used for completing communication interface service, processing service, storage service, signal acquisition service, driving service and the like, and data transmission is carried out through a backboard interconnection technology. Different subsystems and different single machines complete specific functions, and data transmission is performed through a local area network interconnection technology. The application scene and the use requirement are different, the backboard interconnection technology and the local area network interconnection technology have the difference, but with the development of the communication technology and the enhancement of compatibility, the interconnection technology has the development trend across fields so as to realize one-network fusion transmission of module-level resources.

Through literature search discovery of the prior art, technology and product research based on ethernet switching have been carried out, but less involves ethernet switching system construction of the SpaceVPX architecture. The utility model patent with the application number of CN111083070 'time trigger mechanism industrial Ethernet switch equipment' discloses switch equipment consisting of an Ethernet switch processing unit, a storage unit, an auxiliary unit, an interface unit and a central processing unit. The utility model discloses a square shell switch consisting of TTE bus boards, wherein the TTE bus boards are provided with programmable system units on a chip, a plurality of gigabit network ports and a power module. The utility model patent with the application number of CN110166334 space information system based on SpaceVPX standard discloses a space information system composed of an information plane, a system management module, a main control module, an exchange module and a functional module which are mutually connected in a communication mode, wherein the exchange module is used for limiting the interaction relation among the modules. The utility model patent with the application number of CN113985763 'unmanned war vehicle control system time triggering Ethernet network architecture' discloses a comprehensive safety key control and management system with a distributed architecture, which takes the Ethernet network architecture based on a time triggering technology as a main communication platform, is configured into a star-shaped switching network topology structure, a dual-redundancy time triggering network bus communication switch is communicated with each node, and data transmission is carried out among the nodes through the forwarding of switch equipment. The utility model patent with the application number of CN113422741 'a time-triggered Ethernet switch structure' discloses a time-triggered Ethernet switch structure supporting efficient data storage and forwarding of mixed service, the parallel processing capacity of data forwarding is improved by a way of separate storage and processing, and the mixed service processing is realized by a way of separate queues of time triggering, AFDX and event triggering messages.

Searching and analyzing the prior art can find that the following problems exist:

1) The existing switch is mainly oriented to the interconnection between different single machines/devices, lacks a cross-domain unified design for realizing the interconnection of a back plate and the interconnection of a local area network, and is not beneficial to reducing the network level and the high-efficiency comprehensive utilization of network node resources;

2) Aiming at high-performance, high-bandwidth and high-reliability network transmission under the limitation of satellite-borne resources, double redundancy transmission needs to be realized, and meanwhile, the functional density is improved as much as possible, and the resource overhead is reduced.

In order to further promote the application of the SpaceVPX standard product and the Ethernet technology, a technical scheme is provided to improve the technical problems.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide a dual-redundancy Ethernet switching system based on a SpaceVPX architecture.

The utility model provides a dual redundancy Ethernet switching system based on a SpaceVPX architecture, which comprises: the system comprises a plurality of switching units, wherein one switching unit consists of two main and standby redundant switching modules with the same function;

the exchange module comprises a back plate exchange module and a region exchange module, wherein the back plate exchange module is a single-board double-machine redundancy backup mode, and the region exchange module is a single-board single-machine redundancy backup mode; the external Ethernet interface of the back plate exchange module is led out through a back plate connector, and the external Ethernet interface of the area exchange module is led out through an external connector; the back plate exchange module is connected with the area exchange module through an Ethernet interface led out by the external plug-in unit to carry out multi-hop network;

the exchange unit is composed of a back board exchange module which is inserted into a single machine of the SpaceVPX framework, and the back board exchange module is connected with the back board Ethernet interfaces of all the functional modules in the single machine through the Ethernet interfaces led out by the back board connectors to exchange data among all the functional modules in the single machine; one or more exchange units formed by the regional exchange modules form an Ethernet switch of a SpaceVPX framework, and Ethernet interfaces led out through external connectors are connected with Ethernet interfaces of each functional single machine in the region, the regional back plate exchange modules and other Ethernet switches in the region to exchange Ethernet data among different single machines.

Preferably, a double star connection mode is adopted among the plurality of switching units, the switching unit formed by one regional switching module is a central switching unit in the system, and the switching units formed by other regional switching modules and the switching unit formed by the back plate switching module are used as edge switching units to be directly connected to the central switching unit.

Preferably, the back board exchange module and the area exchange module are composed of an FPGA circuit, an Ethernet interface circuit, an RS422 interface circuit and a power supply conversion circuit;

the FPGA circuit: the back board exchange module host and the standby are respectively configured with independent FPGA circuits; the area exchange module is configured with an FPGA circuit; the FPGA logic code performs two-layer exchange processing of the Ethernet data frame;

the ethernet interface circuit: the back board exchange module host and the standby machine respectively provide at least 4 paths of full duplex Ethernet interfaces through the external plug-in units, respectively provide at least 8 paths of full duplex Ethernet interfaces through the back board plug-in units, wherein the host machine is led out through the back board plug-in unit slot P3/J3, and the standby machine is led out through the back board plug-in unit slot P4/J4; the area exchange module provides at least 12 paths of full duplex Ethernet interfaces through the external plug-in unit, and provides 2 paths of full duplex Ethernet interfaces through the backboard plug-in unit.

Preferably, the RS422 interface circuit: the back board exchange module host and the standby machine respectively provide 2 paths of RS422 receiving and transmitting interfaces through the back board connector; the regional exchange module provides 2 paths of RS422 transceiving interfaces through an external plug-in; the exchange module receives a module remote control command through the RS422 interface circuit, sends telemetry state data and reconstructs an FPGA circuit logic code on line;

the power conversion circuit: the back panel exchange module host and the standby machine respectively take secondary power supplies needed by the modules through back panel connectors; the regional exchange module takes the secondary power supply needed by the module through the backboard connector; the secondary power supply taken from the backboard is converted into the power supply voltage of the components required by the FPGA circuit, the Ethernet interface circuit and the RS422 interface circuit in the module by the power supply conversion circuit.

Preferably, the Ethernet interface circuit led out by the external plug-in adopts a transformer direct connection mode, and the Ethernet interface circuit led out by the backboard connector adopts a PHY direct connection mode or a MAC direct connection mode;

the transformer direct connection mode comprises the following steps: the Ethernet interface circuit comprises a PHY chip and a network transformer chip, and the differential signals are transmitted in an Ethernet long distance through the network transformer chip 4.

Preferably, the PHY direct connection mode: the Ethernet interface circuit comprises a PHY chip, and the differential signals are transmitted on the Ethernet backboard in a short distance through the PHY chip 4;

the MAC direct connection mode comprises the following steps: and carrying out MAC logic by an FPGA circuit, carrying out short-distance transmission on a backboard by adopting 2 pairs of differential signals of SGMII protocol, and adopting the front 2 pairs of differential signals of 4 pairs of differential signals in PHY direct connection, wherein definition of backboard network nodes in two connection modes of PHY direct connection and MAC direct connection is consistent.

Preferably, the RS422 transceiver interfaces of the back board exchange module and the area exchange module adopt an asynchronous communication mode, and the application layer adopts a spatial data packet protocol; the Ethernet communication of the back plate exchange module and the area exchange module adopts a TCP/IP protocol model, the physical layer follows the specification of an Ethernet IEEE802.3 protocol physical layer, the data link layer adopts an MAC frame format in IEEE Std802.3-2005, and the application layer adopts a space data packet protocol; and the RS422 performs bidirectional data fusion transmission based on a space data packet protocol between asynchronous communication and Ethernet communication.

Preferably, the ethernet switch of the SpaceVPX architecture is composed of a plurality of switching units, a secondary power module, a single-machine backboard and a chassis; the secondary power supply module provides multiple paths of secondary power supplies for the exchange units through the backboard, the exchange module host and the standby machine in each exchange unit are respectively and independently powered by the secondary power supply module, and the exchange module host or the exchange module standby machine in different exchange units share a group of secondary power supplies; the secondary power supply module consists of a plurality of mutually independent conversion circuit units, and the combination of the independent secondary power supply modules meets the power supply requirement of the Ethernet switch; each path of conversion circuit unit has the functions of input protection, filtering, voltage conversion, switch control and voltage acquisition.

Preferably, in the 2-path full duplex ethernet interface provided by the area switching module through the backplane connector, 1 path is used as an ethernet end system node of the area switching module, and 1 path is used as an ethernet switching interface of the area switching module; the 2-path full duplex Ethernet interfaces of the host and the standby of the regional exchange modules are interconnected, wherein the Ethernet end system node of 1 regional exchange module is connected with the Ethernet exchange interface of the other 1 regional exchange module.

The back board exchange module provides no less than 8 paths of full duplex Ethernet interfaces and supports the Ethernet interconnection of no less than 8 functional modules.

Compared with the prior art, the utility model has the following beneficial effects:

1. the dual-redundancy Ethernet switching system based on the SpaceVPX framework provided by the utility model realizes the Ethernet interconnection between modules in a single machine by the back board switching module, realizes the Ethernet interconnection between the single machines by the area switching module, and realizes the unified design of back board interconnection switching and local area network interconnection switching;

2. according to the dual-redundancy Ethernet switching system based on the SpaceVPX framework, the back board switching module and the area switching module both adopt the SpaceVPX framework, so that an integrated high-performance, high-bandwidth and high-reliability network system is constructed, the generalized and standardized design of the switching module is realized, the network switching function density is improved, and the resource cost is reduced;

3. the dual-redundancy Ethernet switching system based on the SpaceVPX architecture provided by the utility model has the advantages that the back board switching module and the area switching module support dual-redundancy reliable transmission and support the expansion of the switching path number of the module level;

4. the dual-redundancy Ethernet switching system based on the SpaceVPX architecture provided by the utility model realizes bidirectional data fusion transmission based on a space data packet protocol between RS422 asynchronous communication and Ethernet communication.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of the configuration and hierarchy of a dual redundant Ethernet switching system based on the SpaceVPX architecture of the present utility model;

FIG. 2 is a schematic diagram of a stand-alone implementation of Ethernet connections through a backplane switching unit based on a SpaceVPX architecture;

FIG. 3 is a schematic diagram of a SpaceVPX fabric-based Ethernet switch;

FIG. 4 is a functional block diagram of a secondary power module of the Ethernet switch;

FIG. 5 is a schematic diagram of a dual star dual redundancy switching network topology;

FIG. 6 is a schematic diagram of the switch module composition;

FIG. 7 is a schematic diagram of an RS422 interface circuit;

FIG. 8 is a schematic diagram of an Ethernet network interface;

FIG. 9 is a schematic diagram of a PHY direct connection mode of an Ethernet network interface;

FIG. 10 is a schematic diagram of an Ethernet network interface MAC direct connection scheme;

fig. 11 is a schematic diagram of a communication protocol model of the RS422 and ethernet interface.

Detailed Description

The present utility model will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present utility model.

Example 1:

the utility model provides a dual redundancy Ethernet switching system based on a SpaceVPX architecture, which comprises: and the switching units are composed of two main and standby redundant switching modules with the same function.

The exchange module comprises a back plate exchange module and a region exchange module, wherein the back plate exchange module is a single-board double-machine redundancy backup mode, and the region exchange module is a single-board single-machine redundancy backup mode; the external Ethernet interface of the back plate exchange module is led out through a back plate connector, and the external Ethernet interface of the regional exchange module is led out through an external connector; the back plate exchange module is connected with the area exchange module through an Ethernet interface led out by the external plug-in unit to carry out multi-hop network.

The multiple exchange units adopt a double star connection mode, the exchange unit formed by one regional exchange module is a central exchange unit in the system, and the exchange units formed by other regional exchange modules and the exchange unit formed by the back plate exchange module are used as edge exchange units to be directly connected into the central exchange unit.

The back plate exchange module and the area exchange module are composed of an FPGA circuit, an Ethernet interface circuit, an RS422 interface circuit and a power supply conversion circuit.

FPGA circuit: the back board exchange module host and the standby are respectively configured with independent FPGA circuits; the area exchange module is configured with an FPGA circuit; and the FPGA logic code performs Ethernet data frame two-layer exchange processing.

Ethernet interface circuitry: the back board exchange module host and the standby machine respectively provide at least 4 paths of full duplex Ethernet interfaces through the external plug-in units, respectively provide at least 8 paths of full duplex Ethernet interfaces through the back board plug-in units, wherein the host machine is led out through the back board plug-in unit slot P3/J3, and the standby machine is led out through the back board plug-in unit slot P4/J4; the area exchange module provides at least 12 paths of full duplex Ethernet interfaces through the external plug-in unit, and provides 2 paths of full duplex Ethernet interfaces through the backboard plug-in unit.

RS422 interface circuit: the back board exchange module host and the standby machine respectively provide 2 paths of RS422 receiving and transmitting interfaces through the back board connector; the regional exchange module provides 2 paths of RS422 transceiving interfaces through an external plug-in; the exchange module receives the module remote control command and sends the telemetry state data through the RS422 interface circuit, and reconstructs the FPGA circuit logic code on line.

A power conversion circuit: the back panel exchange module host and the standby machine respectively take secondary power supplies needed by the modules through back panel connectors; the regional exchange module takes the secondary power supply needed by the module through the backboard connector; the secondary power supply taken from the backboard is converted into the power supply voltage of the components required by the FPGA circuit, the Ethernet interface circuit and the RS422 interface circuit in the module by the power supply conversion circuit.

The Ethernet interface circuit led out by the external plug-in adopts a transformer direct connection mode, and the Ethernet interface circuit led out by the backboard connector adopts a PHY direct connection mode or a MAC direct connection mode.

The direct connection mode of the transformer is as follows: the Ethernet interface circuit comprises a PHY chip and a network transformer chip, and the differential signals are transmitted in an Ethernet long distance through the network transformer chip 4.

PHY direct connection mode: the ethernet interface circuit comprises a PHY chip, and the differential signals are transmitted over short distances on the ethernet backplane via the PHY chip 4.

MAC direct connection mode: and carrying out MAC logic by an FPGA circuit, carrying out short-distance transmission on a backboard by adopting 2 pairs of differential signals of SGMII protocol, and adopting the front 2 pairs of differential signals of 4 pairs of differential signals in PHY direct connection, wherein definition of backboard network nodes in two connection modes of PHY direct connection and MAC direct connection is consistent.

The RS422 transceiver interfaces of the back plate exchange module and the area exchange module adopt an asynchronous communication mode, and the application layer adopts a space data packet protocol; the Ethernet communication of the back plate exchange module and the area exchange module adopts a TCP/IP protocol model, the physical layer follows the specification of an Ethernet IEEE802.3 protocol physical layer, the data link layer adopts an MAC frame format in IEEE Std802.3-2005, and the application layer adopts a space data packet protocol; and the RS422 performs bidirectional data fusion transmission based on a space data packet protocol between asynchronous communication and Ethernet communication.

The Ethernet switch of the SpaceVPX framework consists of a plurality of switching units, a secondary power module, a single-machine backboard and a case; the secondary power supply module provides multiple paths of secondary power supplies for the exchange units through the backboard, the exchange module host and the standby machine in each exchange unit are respectively and independently powered by the secondary power supply module, and the exchange module host or the exchange module standby machine in different exchange units share a group of secondary power supplies; the secondary power supply module consists of a plurality of mutually independent conversion circuit units, and the combination of the independent secondary power supply modules meets the power supply requirement of the Ethernet switch; each path of conversion circuit unit has the functions of input protection, filtering, voltage conversion, switch control and voltage acquisition.

In the 2-path full duplex Ethernet interface provided by the regional exchange module through the backboard connector, 1 path is used as an Ethernet end system node of the regional exchange module, and 1 path is used as an Ethernet exchange interface of the regional exchange module; the 2-path full duplex Ethernet interfaces of the host and the standby of the regional exchange modules are interconnected, wherein the Ethernet end system node of 1 regional exchange module is connected with the Ethernet exchange interface of the other 1 regional exchange module.

The backplane switching module provides no less than 8 full duplex ethernet interfaces supporting ethernet interconnection of no less than 8 functional modules.

The utility model relates to a dual-redundancy Ethernet switching system based on a SpaceVPX framework, which comprises a switching unit formed by two main and standby redundancy switching modules with the same function, and a switching system formed by a plurality of switching units; the exchange modules are divided into two types, namely a backboard exchange module and a regional exchange module, wherein the external Ethernet interface of the backboard exchange module is mainly led out through a backboard connector, and the external Ethernet interface of the regional exchange module is mainly led out through an external connector; the exchange unit formed by the back board exchange modules is usually inserted into a single machine of a space VPX framework, and an Ethernet interface led out through a back board connector is connected with the back board Ethernet interface of each functional module in the single machine; one or more exchange units formed by the regional exchange modules can form an Ethernet switch of a SpaceVPX framework, and an Ethernet interface led out through an external plug-in unit is connected with each functional single machine in the region, the regional back plate exchange module and the Ethernet interfaces of other Ethernet switches in the region; the back board exchange module and the area exchange module mainly comprise an FPGA circuit, an Ethernet interface circuit, an RS422 interface circuit and a power supply conversion circuit; the Ethernet interface circuit led out by the external plug-in adopts a transformer direct connection mode, and the Ethernet interface circuit led out by the backboard connector adopts a PHY direct connection mode or a MAC direct connection mode. The utility model realizes unified design of backboard interconnection exchange and local area network interconnection exchange by adopting the SpaceVPX architecture based on the integration transmission of backboard interconnection and local area network interconnection of Ethernet technology, improves the functional density and reduces the resource expense.

Example 2:

aiming at the defects of the prior art, the utility model aims to provide a dual-redundancy Ethernet switching system based on a SpaceVPX architecture, which realizes the fusion transmission of backboard interconnection and local area network interconnection based on the Ethernet technology.

In this embodiment, the dual redundancy ethernet switching system based on the SpaceVPX architecture of the present utility model is a switching unit formed by two active-standby redundancy switching modules with the same function, and a switching system is formed by a plurality of switching units. The exchange modules are divided into two types, namely a backboard exchange module and a regional exchange module. The back plate exchange module is a single-plate double-machine redundancy backup mode, and the single module comprises two independent circuits of a host machine and a standby machine. The regional exchange module is a single-board single-machine redundancy backup mode, a single module only comprises one set of circuit, and the main redundancy and the standby redundancy are realized by adopting two identical modules. The external Ethernet interface of the back plate exchange module is mainly led out through a back plate connector, and the external Ethernet interface of the area exchange module is mainly led out through an external connector; the back plate exchange module is connected with the area exchange module through an Ethernet interface led out by the external plug-in unit to realize a multi-hop network. The dual redundant ethernet switching system is configured and layered as shown in fig. 1.

The exchange unit formed by the back board exchange module is usually inserted into a single machine of the SpaceVPX framework, and the back board exchange module is connected with the back board Ethernet interface of each functional module in the single machine through the Ethernet interface led out by the back board connector, so that the data exchange among the functional modules in the single machine is realized. The Ethernet links of the main and standby units of the switching unit and the functional modules adopt a cross redundancy backup mode. As shown in fig. 2.

One or more exchange units formed by the regional exchange modules can form an Ethernet switch of a SpaceVPX framework, and Ethernet interfaces led out through external connectors are connected with each functional single machine in the region, the regional back plate exchange modules and the Ethernet interfaces of other Ethernet switches in the region, so that Ethernet data exchange among different single machines is realized. The main and standby machine links among different exchange units adopt a cross redundancy backup mode. The Ethernet switch consists of a plurality of switching units, a secondary power module, a single-machine backboard and a case, as shown in fig. 3.

The secondary power supply module provides multiple paths of secondary power supplies for the exchange units through the backboard, the exchange module host and the standby machine in each exchange unit are independently powered by the secondary power supply module respectively, and the exchange module host or the exchange module standby machine in different exchange units can share one group of secondary power supplies or can adopt different secondary power supplies. In order to adapt to different demands of different Ethernet exchange mechanisms on the number of secondary power supply paths, the secondary power supply module is subjected to generalized design. The secondary power module is composed of multiple mutually independent conversion circuit units, as shown in fig. 4, and the multiple independent secondary power modules meet the power supply requirement of the Ethernet switch. The fault isolation capability is provided between different conversion circuit units and between the secondary power supply modules, and the secondary power supply output fault of one conversion circuit unit does not influence the functions of other conversion circuit units. Each path of conversion circuit unit has the functions of input protection, filtering, voltage conversion, switch control, voltage acquisition and the like.

And a double star type connection mode is adopted among the plurality of exchange units. In order to reduce the number of switching hops in the data transmission process as much as possible, the switching unit formed by one area switching module is a central switching unit in the system, and the switching units formed by other area switching modules and the switching unit formed by the back board switching module are used as edge switching units to be directly connected to the central switching unit as much as possible, as shown in fig. 5. The central switching unit is a bottleneck of network data transmission, so that when the connection configuration of the network and the Ethernet end system is planned, the data transmission load of the switching unit is balanced as much as possible, and the data transmission through the central switching unit is reduced.

The back board exchange module and the area exchange module mainly comprise an FPGA circuit, an Ethernet interface circuit, an RS422 interface circuit and a power supply conversion circuit, as shown in fig. 6, wherein:

(1) The FPGA circuit realizes two-layer exchange processing of Ethernet data frames, the back plate exchange module host and the standby computer are respectively configured with independent FPGA circuits, and the regional exchange module is configured with the FPGA circuits.

(2) The Ethernet interface circuit is used for realizing the input and output of Ethernet data of the switching module. The back board exchange module host and the standby machine respectively provide at least 4 paths of full duplex Ethernet interfaces through the external plug-in units, and respectively provide at least 8 paths of full duplex Ethernet interfaces through the back board plug-in units, wherein the host machine is led out through the back board plug-in unit slot P3/J3 as shown in the table 1, and the standby machine is led out through the back board plug-in unit slot P4/J4 as shown in the table 2. The area exchange module provides at least 12 paths of full duplex Ethernet interfaces through the external plug-in unit, and provides 2 paths of full duplex Ethernet interfaces through the backboard plug-in unit.

Table 1 exchange Module socket contact Table-P3

Table 2 control Module socket contact Table-P4

(3) The exchange module receives the module remote control command and sends the telemetry state data through the RS422 interface circuit, and can reconstruct the FPGA circuit logic code on line. The back board exchange module host and the standby machine respectively provide 2 paths of RS422 transceiving interfaces through the back board connector, and the area exchange module provides 2 paths of RS422 transceiving interfaces through the external connector, as shown in fig. 7.

(4) The power conversion circuit converts the secondary power taken from the backboard into the power voltage of the components required by the FPGA circuit, the Ethernet interface circuit, the RS422 interface circuit and the like in the module. The back board exchange module host and the standby machine respectively take secondary power supplies needed by the modules through the back board connectors. The regional exchange module takes the secondary power supply needed by the module through the backboard connector. The secondary power is input through the back board connector slot P0/J0.

The ethernet interface circuit led out through the external connector adopts a transformer direct connection mode, and the ethernet interface circuit led out through the back board connector adopts a PHY direct connection mode or a MAC direct connection mode, as shown in fig. 8, specifically:

(1) The transformer direct connection mode, the Ethernet interface circuit comprises a PHY chip 88E1111, network transformer chips 1000B-5001X and corresponding crystal oscillator ZA715CB2, the network transformer realizes the impedance matching of Ethernet differential signal transmission, common mode interference filtering, DC isolation, signal coupling and the like, and the network transformer chip 4 is used for realizing the safe and reliable transmission of the Ethernet for long distance of differential signals.

(2) The PHY direct connection mode, the ethernet interface circuit includes a PHY chip 88E1111 and a corresponding crystal oscillator ZA715CB2. The PHY is a physical layer interface transceiver, which performs serial-parallel conversion, data encoding, link detection, and other functions, and provides a standard interface for a data link, and implements short-distance safe and reliable transmission on an ethernet backplane through the PHY chip 4 for differential signals, as shown in fig. 9. Attention is paid to the matching of the PHY chip driving scheme at both ends of communication.

(3) In the MAC direct connection mode, an FPGA circuit is used for realizing MAC logic, and 2 pairs of differential signals of SGMII protocol are used for realizing short-distance safe and reliable transmission on a backboard, as shown in figure 10.

The transformer connection, the PHY direct connection and the MAC direct connection all adopt differential signal pair full duplex transmission, and the definition of the back panel network nodes of the two connection modes of the PHY direct connection and the MAC direct connection is kept consistent by adopting the first 2 pairs of differential signals of 4 pairs of differential signals in the PHY direct connection. In the following table, phy0_mx0 and phy1_mx0 are data receiving ends in the direction from the switch module, and phy0_mx1 and phy1_mx1 are data transmitting ends in the direction from the switch module.

The PHY direct connection or MAC direct connection mode is adopted, so that the functional density of the module can be improved, the layout area of an interface device is reduced, and the transmission link is simplified.

The RS422 transceiver interfaces of the back plate exchange module and the area exchange module adopt an asynchronous communication mode, and the application layer adopts a space data packet protocol. The Ethernet communication of the back plate exchange module and the area exchange module adopts a TCP/IP protocol model, the physical layer conforms to the specification of an Ethernet IEEE802.3 protocol physical layer, the data link layer adopts a MAC frame format, and the application layer adopts a space data packet protocol. Two-way data fusion transmission based on a space data packet protocol is realized between RS422 asynchronous communication and Ethernet communication, and a communication protocol model is shown in fig. 11.

The back board exchange module provides at least 8 paths of full duplex Ethernet interfaces, can support Ethernet interconnection of at least 8 functional modules, and can be added if more functional modules are required to be configured by a single machine.

The present embodiment will be understood by those skilled in the art as a more specific description of embodiment 1.

Those skilled in the art will appreciate that the utility model provides a system and its individual devices, modules, units, etc. that can be implemented entirely by logic programming of method steps, in addition to being implemented as pure computer readable program code, in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Therefore, the system and various devices, modules and units thereof provided by the utility model can be regarded as a hardware component, and the devices, modules and units for realizing various functions included in the system can also be regarded as structures in the hardware component; means, modules, and units for implementing the various functions may also be considered as either software modules for implementing the methods or structures within hardware components.

The foregoing describes specific embodiments of the present utility model. It is to be understood that the utility model is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the utility model. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.

Claims

1. A dual redundant ethernet switching system based on a SpaceVPX architecture, comprising: the system comprises a plurality of switching units, wherein one switching unit consists of two main and standby redundant switching modules with the same function;

2. The dual redundant ethernet switching system based on SpaceVPX architecture according to claim 1, wherein a dual star connection mode is adopted between a plurality of the switching units, the switching unit formed by one area switching module is a central switching unit in the system, and the switching units formed by other area switching modules and the switching unit formed by the back board switching module are used as edge switching units to directly access the central switching unit.

3. The dual redundant ethernet switching system based on a SpaceVPX architecture according to claim 1, wherein the backplane switching module and the area switching module are composed of FPGA circuits, ethernet interface circuits, RS422 interface circuits, and power conversion circuits;

4. The dual redundant ethernet switching system based on the SpaceVPX architecture according to claim 3, wherein,

the RS422 interface circuit: the back board exchange module host and the standby machine respectively provide 2 paths of RS422 receiving and transmitting interfaces through the back board connector; the regional exchange module provides 2 paths of RS422 transceiving interfaces through an external plug-in; the exchange module receives a module remote control command through the RS422 interface circuit, sends telemetry state data and reconstructs an FPGA circuit logic code on line;

5. The dual redundant ethernet switching system based on SpaceVPX architecture according to claim 3, wherein the ethernet interface circuit led out through the external connector adopts a transformer direct connection mode, and the ethernet interface circuit led out through the back board connector adopts a PHY direct connection mode or a MAC direct connection mode;

6. The dual redundant ethernet switching system based on the SpaceVPX architecture of claim 5, wherein,

the PHY direct connection mode comprises the following steps: the Ethernet interface circuit comprises a PHY chip, and the differential signals are transmitted on the Ethernet backboard in a short distance through the PHY chip 4;

7. The dual redundant ethernet switching system based on SpaceVPX architecture according to claim 1, wherein RS422 transceiver interfaces of the backplane switching module and the area switching module adopt an asynchronous communication mode, and an application layer adopts a spatial data packet protocol; the Ethernet communication of the back plate exchange module and the area exchange module adopts a TCP/IP protocol model, the physical layer follows the specification of an Ethernet IEEE802.3 protocol physical layer, the data link layer adopts an MAC frame format in IEEE Std802.3-2005, and the application layer adopts a space data packet protocol; and the RS422 performs bidirectional data fusion transmission based on a space data packet protocol between asynchronous communication and Ethernet communication.

8. The dual redundant ethernet switching system based on a SpaceVPX architecture according to claim 1, wherein the ethernet switch of the SpaceVPX architecture is composed of a plurality of switching units, a secondary power module, a single-machine back plate and a chassis; the secondary power supply module provides multiple paths of secondary power supplies for the exchange units through the backboard, the exchange module host and the standby machine in each exchange unit are respectively and independently powered by the secondary power supply module, and the exchange module host or the exchange module standby machine in different exchange units share a group of secondary power supplies; the secondary power supply module consists of a plurality of mutually independent conversion circuit units, and the combination of the independent secondary power supply modules meets the power supply requirement of the Ethernet switch; each path of conversion circuit unit has the functions of input protection, filtering, voltage conversion, switch control and voltage acquisition.

9. The dual redundant ethernet switching system based on a SpaceVPX architecture according to claim 1, wherein the area switching module is provided with 2 paths of full duplex ethernet interfaces through a backplane connector, wherein 1 path is an ethernet end system node of the area switching module, and 1 path is an ethernet switching interface of the area switching module; the 2-path full duplex Ethernet interfaces of the host and the standby of the regional exchange modules are interconnected, wherein the Ethernet end system node of 1 regional exchange module is connected with the Ethernet exchange interface of the other 1 regional exchange module.

10. The dual redundant ethernet switching system based on the SpaceVPX architecture of claim 1, wherein said backplane switching module provides no less than 8 full duplex ethernet interfaces supporting ethernet interconnection of no less than 8 functional modules.