CN108134725B - NC and NT data communication method - Google Patents
NC and NT data communication method Download PDFInfo
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- CN108134725B CN108134725B CN201711337711.8A CN201711337711A CN108134725B CN 108134725 B CN108134725 B CN 108134725B CN 201711337711 A CN201711337711 A CN 201711337711A CN 108134725 B CN108134725 B CN 108134725B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/4028—Bus for use in transportation systems the transportation system being an aircraft
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Abstract
The invention relates to a data communication method of NC and NT, relating to the technical field of time frequency measurement. In the invention, a Network Controller (NC) and a Network Terminal (NT) adopt an Ethernet communication method (1553oE) based on a 1553B protocol for communication. The invention has 1553B certainty and real-time performance, and can be compatible with traditional 1553B equipment; the method has the characteristics of high speed, low cost and the like of the Ethernet, can improve the data transmission rate of the bus, and can meet the development of a modern aerospace bus system.
Description
Technical Field
The invention relates to the technical field of Ethernet communication, in particular to a data communication method of NC and NT.
Background
In recent years, the 1Mb/s rate of the traditional 1553B bus is far from meeting the requirements of large-quantity and high-speed transmission of videos, voices and the like due to the updating and upgrading of aerospace vehicles, and the speed is gradually the bottleneck of the development of aerospace bus systems. In the field of aerospace, a 1553B protocol is adopted by a large number of terminals, and a new bus system must be compatible with traditional 1553B equipment to realize stable upgrading of the bus system.
In recent years, ethernet technology has been rapidly developed. Ethernet is a standard open network; the data transmission rate is high, and the data transmission rate supports 10Mbps, 100Mbps, 1Gbps and 10 Gbps; support multiple physical media and flexible topologies; the cost and the expense are low. The advantages mentioned above make ethernet widely used, and have become the mainstream technology of commercial communication.
All the terminal devices of the Ethernet are completely autonomous, and the receiving and sending packets are not uniformly managed and controlled, so that conflicts are generated on the occupied Ethernet bus, the bus bandwidth is competed, and uncertainty is brought. Ethernet encounters great resistance in its application to bus systems in the aerospace field.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to realize an Ethernet communication system with 1553B bus real-time performance, determinacy and high-speed and low-cost Ethernet bus, and the Ethernet communication system is compatible with the traditional 1553B bus equipment, and a data communication method of NC and NT is realized based on the system.
(II) technical scheme
In order to solve the above technical problems, the present invention provides a data communication method for NC and NT implemented by an ethernet communication system based on 1553B protocol, the system includes a network controller NC and a network terminal NT, the interconnection of NC and NT is implemented by an ethernet switching network, NC and NT are both network devices, each network device communicates by using an ethernet communication method based on 1553B protocol, the ethernet communication method based on 1553B protocol is implemented by using 1553oE ethernet, the 1553oE ethernet is abbreviated as 1553oE, and 1553oE is defined as: the system conforms to an OSI seven-layer network model, and only a 1553oE control sublayer is added in a data link layer of the OSI seven-layer network model for realizing communication based on a 1553B protocol; the frame structure of 1553oE comprises a destination address, a source address, a type/length, a 1553oE frame header, upper layer protocol data and FCS check; the control and state display of 1553oE is determined by 1553oE frame header, and the 1553oE frame header respectively represents command frame header, state frame header and data frame header according to different definitions; 1553oE the command frame, the status frame and the data frame are exchanged via Ethernet network, the source address of 1553oE the command frame, the status frame and the data frame is the MAC address of the sending device, and the destination address is the MAC address of the receiving device; the Ethernet switching network only carries out Ethernet frame switching according to the 1553oE command frame, the status frame and the destination address of the data frame, and switches the Ethernet frame to correct receiving network equipment;
the network controller NC of 1553oE is used for managing data transmission of each NT terminal in the scheduling system, only one NC works in the system at any time, the NC can send 1553oE command frames and data frames to the NTs, can receive 1553oE status frames and data frames sent by the NTs, and the NC has a unique MAC address in an ethernet switching network;
the network terminal NT of the 1553oE can not initiate data transmission actively, the data transmission is realized according to the management scheduling of the NC, the NT can receive 1553oE command frames and data frames sent by the NC and can send 1553oE status frames and data frames to the NC, and the NT has a unique MAC address in an Ethernet switching network;
the method comprises the following steps:
1) the NC sends 1553oE command frames to the NT, the command frames can carry data or follow data frames, the source addresses of the command frames and the data frames sent to the NT are the MAC addresses of the NC, and the destination addresses are the MAC addresses of the NT;
2) the Ethernet switching network only carries out Ethernet frame switching according to the destination addresses of the 1553oE command frames and the data frames, and switches the command frames and the data frames to the network port where the NT is located;
3) the NT receives the command frame and the data frame, and sends a status frame to the NC, wherein the status frame can carry data or follow the data frame, the source addresses of the status frame and the data frame sent to the NC are the MAC address of the NT, and the destination address is the MAC address of the NC;
4) the Ethernet switching network only carries out Ethernet frame switching according to the destination addresses of the 1553oE state frames and the data frames, and switches the state frames and the data frames to the network port where the NC is located;
5) and the NC receives the status frame sent by the NT, or the status frame and the data frame, and completes data communication.
Preferably, the 1553oE command frame is used for realizing a command of a 1553 protocol, optionally carrying data, and when the length of the 1553oE command frame is less than the minimum frame length of the Ethernet, filling a complementary frame length; when the length of the 1553oE command frame is longer than the maximum frame length of the Ethernet, the command frame and 1 or more data frames are split;
the 1553oE status frame is used for realizing the response of the 1553 protocol and optionally carrying data; when the length of the 1553oE state frame is less than the minimum frame length of the Ethernet, filling a complementary frame length; when the length of the 1553oE status frame is longer than the maximum frame length of the Ethernet, the status frame and 1 or more data frames are split;
1553oE the data frame is not used alone, and follows the command frame or status frame for data transmission;
1553oE is used for realizing data transmission of 1553B protocol, a network controller NC of 1553oE is equivalent to BC of 1553B bus, a network terminal NT of 1553oE is equivalent to RT of 1553B bus, NC of 1553oE is used for transmitting command frames and data frames, and NT of 1553oE is used for transmitting status frames and data frames.
Preferably, the 1553oE realizes that the data transmission mode from the BC of the 1553B bus to the RT of the 1553B bus is that the NC of 1553oE sends a command frame, carries data and can optionally send a data frame; the NT of 1553oE carries out receiving processing, responds to the NC of 1553oE, and sends a state frame without carrying data;
1553oE realizes that the data transmission mode from RT of 1553B bus to BC of 1553B bus is that NC of 1553oE sends command frame without carrying data, NT of 1553oE receives and processes, responds to NC of 1553oE, sends status frame, carries data, and optionally sends data frame;
1553oE realizes various mode codes used by 1553B for control, and when the 1553oE mode codes are transmitted, the values of the sub address fields of the command frame headers of the mode codes are all 0 or all 1; 1553oE realizes that the mode code transmission mode from BC of 1553B bus to RT of 1553B bus is that NC of 1553oE sends a command frame in the format of mode code command frame header + mode code + filling; the NT of 1553oE is used for receiving and processing, responding to the NC of 1553oE and sending a state frame in the format of a state frame header + filling;
1553oE realizes that the mode code transmission mode from RT of 1553B bus to BC of 1553B bus is that NC of 1553oE sends a command frame in the format of mode code command frame header + filling; the NT of 1553oE performs receive processing, responds to the NC of 1553oE, and sends a status frame in the format of status frame header + mode code + padding.
Preferably, the system adopts a 1553oE network bridge NB to realize the bridging of a 1553oE network controller NC and a 1553B bus RT and realize the data communication between the system and the 1553B bus;
the 1553B bus RT has a virtual MAC address in a system and has uniqueness in an Ethernet switching network;
the 1553oE network bridge NB is used for realizing the relative mapping between a 1553oE network MAC address and a 1553B bus RT address; and also for implementing a relative mapping between 1553oE command frames and 1553B bus command words and data words, and a relative mapping between 1553oE status frames and 1553B bus status words and data words.
(III) advantageous effects
The invention provides an Ethernet communication system based on a 1553B protocol, which realizes the Ethernet communication system with 1553B bus real-time performance, certainty, high speed and low cost similar to an Ethernet bus, is compatible with traditional 1553B bus equipment, and provides a method for a Network Controller (NC) and a Network Terminal (NT) to communicate based on an Ethernet communication method (1553oE) of the 1553B protocol. The invention has 1553B certainty and real-time performance, and can be compatible with traditional 1553B equipment; the method has the characteristics of high speed, low cost and the like of the Ethernet, can improve the data transmission rate of the bus, and can meet the development of a modern aerospace bus system.
Drawings
FIG. 1 is a block diagram of a 1553oE communication system of the invention;
FIG. 2 is a diagram illustrating an inter NC-NT data transmission format according to the present invention;
FIG. 3 is a diagram illustrating an NC-RT inter-data transmission format according to the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
Fig. 1 is an embodiment of an ethernet communication system based on 1553B protocol according to the present invention, in the system embodiment, there is only one operating Network Controller (NC) and 4 Network Terminals (NT), the interconnection between the NC and NT is realized through an ethernet switching network, the network devices communicate by using an ethernet communication method (1553oE) based on 1553B protocol, the ethernet communication method based on 1553B protocol is realized by using 1553oE ethernet, and the 1553oE ethernet is abbreviated as 1553 oE. The 1553oE is defined as: the system conforms to an OSI seven-layer network model, and only a 1553oE control sublayer is added in a data link layer of the OSI seven-layer network model for realizing communication based on a 1553B protocol; the frame structure of 1553oE comprises a destination address, a source address, a type/length, a 1553oE frame header, upper layer protocol data and FCS check; the control and state display of 1553oE is determined by 1553oE frame header, and the 1553oE frame header respectively represents command frame header, state frame header and data frame header according to different definitions; 1553oE the command frame, the status frame and the data frame are exchanged via Ethernet network, the source address of 1553oE the command frame, the status frame and the data frame is the MAC address of the sending device, and the destination address is the MAC address of the receiving device; and the Ethernet switching network only carries out Ethernet frame switching according to the destination addresses of the 1553oE command frame, the status frame and the data frame and switches the Ethernet frames to correct receiving network equipment.
The network controller NC of 1553oE is used to manage scheduling of data transmissions for each NT terminal in the 1553oE system, with one and only one NC operating in the system at any one time. The NC may send 1553oE command frames and data frames to the NT and may receive 1553oE status frames and data frames sent by the NT. The NC has a MAC address that is unique in the ethernet switching network.
The network terminal NT of 1553oE cannot initiate data transmission actively, and needs to implement data transmission according to the management scheduling of the NC. The NT may receive 1553oE command frames and data frames sent by the NC and may send 1553oE status frames and data frames to the NC. NT has a MAC address unique in the ethernet switched network.
The 1553oE command frame is used for realizing a command of a 1553 protocol and optionally carrying data, and when the length of the 1553oE command frame is less than the minimum frame length of the Ethernet, a complementary frame length is filled; when the length of the 1553oE command frame is longer than the maximum frame length of the Ethernet, the command frame and 1 or more data frames are split;
the 1553oE status frame is used for realizing the response of the 1553 protocol and optionally carrying data; when the length of the 1553oE state frame is less than the minimum frame length of the Ethernet, filling a complementary frame length; when the length of the 1553oE status frame is longer than the maximum frame length of the Ethernet, the status frame and 1 or more data frames are split;
1553oE the data frame is not used alone, and follows the command frame or status frame for data transmission;
1553oE is used for realizing data transmission of 1553B protocol, a network controller NC of 1553oE is equivalent to BC of 1553B bus, a network terminal NT of 1553oE is equivalent to RT of 1553B bus, NC of 1553oE is used for transmitting command frames and data frames, and NT of 1553oE is used for transmitting status frames and data frames.
1553oE realizes the data transmission mode from BC of 1553B bus to RT of 1553B bus, namely NC of 1553oE sends command frames, carries data and can optionally send data frames; the NT of 1553oE carries out receiving processing, responds to the NC of 1553oE, and sends a state frame without carrying data;
1553oE realizes that the data transmission mode from RT of 1553B bus to BC of 1553B bus is that NC of 1553oE sends command frame without carrying data, NT of 1553oE receives and processes, responds to NC of 1553oE, sends status frame, carries data, and optionally sends data frame;
1553oE realizes various mode codes used by 1553B for control, and when the 1553oE mode codes are transmitted, the values of the sub address fields of the command frame headers of the mode codes are all 0 or all 1; 1553oE realizes that the mode code transmission mode from BC of 1553B bus to RT of 1553B bus is that NC of 1553oE sends a command frame in the format of mode code command frame header + mode code + filling; the NT of 1553oE is used for receiving and processing, responding to the NC of 1553oE and sending a state frame in the format of a state frame header + filling;
1553oE realizes that the mode code transmission mode from RT of 1553B bus to BC of 1553B bus is that NC of 1553oE sends a command frame in the format of mode code command frame header + filling; the NT of 1553oE performs receive processing, responds to the NC of 1553oE, and sends a status frame in the format of status frame header + mode code + padding.
The 1553oE network enables data communication between the NC and NT in the following manner, as shown in FIG. 2.
1) The NC may send 1553oE command frames to the NT. The command frame may carry data or follow a data frame. The source address of the command frame and the data frame is the MAC address of NC, and the destination address is the MAC address of NT.
2) The ethernet switching network performs ethernet frame switching only according to the destination addresses of the 1553oE command frames and data frames, and switches the command frames and the data frames to the network port where the NT is located.
3) The NT receives the command frame and the data frame, and sends a status frame, which may carry data or follow the data frame, to the NC. The source address of the status frame and the data frame is the MAC address of NT, and the destination address is the MAC address of NC.
4) The Ethernet switching network only carries out Ethernet frame switching according to the destination addresses of the 1553oE status frames and the data frames, and the status frames and the data frames are switched to the network port where the NC is located.
5) The NC receives the status frame (and data frame) transmitted by the NT, and completes data communication.
In the embodiment, the 1553oE network bridge NB is adopted by the system to realize the bridging of a 1553oE network controller NC and a 1553B bus RT, and realize the data communication between a 1553oE system and a 1553B bus.
The 1553B bus RT equipment has a virtual MAC address in a system and has uniqueness in an Ethernet switching network.
The 1553oE network bridge NB realizes the relative mapping between a 1553oE network MAC address and a 1553B bus RT address.
The 1553oE network bridge NB realizes the relative mapping between the 1553oE command frame and the 1553B bus command word and data word, and between the 1553oE state frame and the 1553B bus state word and data word.
The 1553oE network implements data communication between the NC and the RT in the following manner, as shown in FIG. 3.
1) The NC initiates a command frame to 1 RT device, the source address of the command frame is the MAC address of the NC, the destination address is the virtual MAC address of the RT, and the command frame is transmitted in the Ethernet.
2) The Ethernet switching network only forwards the command frame to the network port where the NB is located according to the destination address of the command frame.
3) After the NB receives the command frame, the protocol maps to a command word (which may be a data word) of the 1553B bus for transmission on the 1553B bus.
4) Upon receipt of the command frame (possibly with a data word), the NT sends a response status word (possibly with a data word) according to the 1553B bus protocol.
5) The NB receives the status word (which may be a data word) and the protocol maps to a status frame of 1553oE network for transmission over the ethernet, the source address of the status frame being the virtual MAC address of the RT and the destination address being the MAC address of the NC.
6) The Ethernet switching network only forwards the state frame to the network port where the NC is located according to the destination address of the state frame.
7) And the NC receives the state frame sent by the RT to finish data communication.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A data communication method of NC and NT realized by Ethernet communication system based on 1553B protocol is characterized in that,
the system comprises a network controller NC and a network terminal NT, the interconnection of the NC and the NT is realized through an Ethernet switching network, the NC and the NT are network devices, the network devices are communicated by adopting an Ethernet communication method based on a 1553B protocol, the Ethernet communication method based on the 1553B protocol is realized by utilizing a 1553oE Ethernet, the 1553oE Ethernet is abbreviated as 1553oE, and the 1553oE is defined as: the system conforms to an OSI seven-layer network model, and only a 1553oE control sublayer is added in a data link layer of the OSI seven-layer network model for realizing communication based on a 1553B protocol; the frame structure of 1553oE comprises a destination address, a source address, a type/length, a 1553oE frame header, upper layer protocol data and FCS check; the control and state display of 1553oE is determined by 1553oE frame header, and the 1553oE frame header respectively represents command frame header, state frame header and data frame header according to different definitions; 1553oE the command frame, the status frame and the data frame are exchanged via Ethernet network, the source address of 1553oE the command frame, the status frame and the data frame is the MAC address of the sending device, and the destination address is the MAC address of the receiving device; the Ethernet switching network only carries out Ethernet frame switching according to the 1553oE command frame, the status frame and the destination address of the data frame, and switches the Ethernet frame to correct receiving network equipment;
the network controller NC of 1553oE is used for managing data transmission of each NT terminal in the scheduling system, only one NC works in the system at any time, the NC can send 1553oE command frames and data frames to the NTs, can receive 1553oE status frames and data frames sent by the NTs, and the NC has a unique MAC address in an ethernet switching network;
the network terminal NT of the 1553oE can not initiate data transmission actively, the data transmission is realized according to the management scheduling of the NC, the NT can receive 1553oE command frames and data frames sent by the NC and can send 1553oE status frames and data frames to the NC, and the NT has a unique MAC address in an Ethernet switching network;
the method comprises the following steps:
1) the NC sends 1553oE command frames to the NT, the command frames can carry data or follow data frames, the source addresses of the command frames and the data frames sent to the NT are the MAC addresses of the NC, and the destination addresses are the MAC addresses of the NT;
2) the Ethernet switching network only carries out Ethernet frame switching according to the destination addresses of the 1553oE command frames and the data frames, and switches the command frames and the data frames to the network port where the NT is located;
3) the NT receives the command frame and the data frame, and sends a status frame to the NC, wherein the status frame can carry data or follow the data frame, the source addresses of the status frame and the data frame sent to the NC are the MAC address of the NT, and the destination address is the MAC address of the NC;
4) the Ethernet switching network only carries out Ethernet frame switching according to the destination addresses of the 1553oE state frames and the data frames, and switches the state frames and the data frames to the network port where the NC is located;
5) and the NC receives the status frame sent by the NT, or the status frame and the data frame, and completes data communication.
2. The method of claim 1, wherein the system employs a 1553oE network bridge NB to bridge a 1553oE network controller NC and a 1553B bus RT to enable data communication between the system and the 1553B bus;
the 1553B bus RT has a virtual MAC address in a system and has uniqueness in an Ethernet switching network;
the 1553oE network bridge NB is used for realizing the relative mapping between a 1553oE network MAC address and a 1553B bus RT address; and also for implementing a relative mapping between 1553oE command frames and 1553B bus command words and data words, and a relative mapping between 1553oE status frames and 1553B bus status words and data words.
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