CN103957170A - IP transmission multiplexer and IP transmission multiplexing and demultiplexing method - Google Patents
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Abstract
The invention discloses an IP transmission multiplexer and an IP transmission multiplexing and demultiplexing method. The IP transmission multiplexer comprises an IP transmission multiplexer A and an IP transmission multiplexer B which are used in pairs, have the same structures and are used for finishing the multiplexing and demultiplexing process of each subnet data during channel two-way transmission. The IP transmission multiplexing and demultiplexing method realizes multiplexing of network isolation through modifying an IP message. According to the invention, the direction of Ethernet multiplexing mode data transmission based on the IP transmission multiplexer is fixed, manual configuration is unnecessary, data packets in a line are distinguished through port numbers, communication among access network ports is not allowed from a realization mechanism, networks connected through different ports are isolated, the timely, reliable and safe transmission of information is ensured, and real-time order type transmission control of information transmission is finally realized.
Description
Technical Field
The invention belongs to the technical field of communication, and relates to a data multiplexing transmission technology of a plurality of subnet access channels.
Background
Because the ethernet tandem device relates to multi-network access, from the security perspective, the access sub-networks cannot be interconnected and intercommunicated, and isolation must be performed, and the key of the sub-network information isolation transmission is to control the communication data. Currently, there are several ways for multiplexing ethernet data:
1. and carrying out subnet isolation on the transport layer switch by dividing the VLAN. The specific method is to divide the access n sub-networks into n VLANs.
However, there is a certain potential safety hazard in using the transport layer switch to manually divide the VLANs for isolation. Since the VLAN can be changed since it is artificially divided, it is possible that the VLAN is changed without the user's knowledge, and the consequences will be even worse if a mirror port is artificially set.
2. By employing a frame relay like synchronous data transmission device.
However, the ports of the synchronous transmission equipment are parallel ports, the rate is limited, and data transmission of more than 9Mbps cannot be realized.
Disclosure of Invention
Aiming at the conditions of potential safety hazard and high network complexity in the existing data multiplexing technology, the invention designs the IP transmission multiplexer, so that the information flow is fixed, the timely, reliable and safe transmission of information is ensured, and the real-time order type transmission control of information transmission is realized.
The invention is realized by the following technical scheme:
an IP transmission multiplexer comprises an IP transmission multiplexer A and an IP transmission multiplexer B which have the same structure, are used in pairs and are correspondingly arranged at two ends of a channel, and data can be transmitted in two directions between the IP transmission multiplexer A and the IP transmission multiplexer B; the IP transmission multiplexer A comprises a plurality of ports accessed by the sub-networks, and each port has a different port number; the IP transmission multiplexer B comprises ports which are accessed by subnets with the same number and the same number as the IP transmission multiplexer A; wherein, when data is transmitted from the IP transport multiplexer A to the IP transport multiplexer B,
the IP transmission multiplexer A is used for receiving the data of each access subnet and multiplexing the data packets according to the ports, the multiplexed IP message carries the port number information of the data source, and the data packets are sent to the channel for transmission after the multiplexing is finished;
the IP transmission multiplexer B is used for receiving the data packet transmitted from the channel, performing demultiplexing on the data packet, and then distributing the data to the subnet access port with the corresponding number according to the port number information carried by the IP message;
when data is transmitted from the IP transmission multiplexer B to the IP transmission multiplexer A, the functions of the IP transmission multiplexer A and the IP transmission multiplexer B are exchanged;
the IP transmission multiplexer A and the IP transmission multiplexer B are connected with the channel through the internet access, and the rapid transmission of data is realized.
Preferably, when multiplexing the data packet, the IP packet is modified to make the multiplexed IP packet carry the port number information of the data source, so as to implement network isolation for multiplexing and demultiplexing.
Furthermore, the IP packet is modified by adding a multiplexing type field and a multiplexing control field in the IP packet, the content of the multiplexing control field includes port number information, and the addition of the multiplexing type field and the multiplexing control field in the IP packet is implemented by the prior art. The data is processed in the transport layer of the OSI system, the format of the original MAC frame is not destroyed, the content of the original IP message is completely reserved, the processing complexity is low, and in the process, the data frame in the channel is added with port number information, so that the overhead is low. When the multiplexing type field is defined as 0X8100, stronger compatibility can be obtained.
Furthermore, the multiplexing control field is self-defined, and besides the port number information, the multiplexing control field contains other information such as whether to segment, whether to segment is the first segment or the last segment, and error correction coding of information. And if the information contains error correction coding information, adopting an extended Hamming code for the error correction coding of the information.
Preferably, the IP transport multiplexer a and the IP transport multiplexer B each mainly include a backplane unit, an indicator light unit, an ethernet interface unit, a main control unit, and a power supply unit; wherein,
the Ethernet interface unit comprises the subnet access ports with different numbers and a relay port connected with the channel side equipment, when the transmission multiplexer is used as a multiplexing end, the subnet access port is used for receiving Ethernet subnet data and then sending the data to the main control unit, and the relay port is used for sending a data packet multiplexed by the main control unit to a channel; when the transmission multiplexer is used as a demultiplexing end, the relay interface is used for receiving a data packet transmitted from a channel and then transmitting the data packet to the main control unit, and the subnet access port is used for transmitting data after the main control unit is demultiplexed to the Ethernet subnet;
the main control unit is used for receiving the data sent by the Ethernet interface unit, caching, scheduling and controlling the flow of the data, and sending the data back to the Ethernet interface unit after multiplexing or demultiplexing the data;
the power supply unit is used for providing electric energy to the IP transmission multiplexer;
the main control unit and the Ethernet interface unit are respectively inserted into corresponding positions of the backboard unit and are connected through a PCI bus of the backboard unit;
and the indicator light unit is used for displaying the working state of the equipment.
Furthermore, each subnet access port on the ethernet interface unit has an independent interface transformer and an independent input/output buffer, a transmission line between each subnet access port and the main control unit, and data transmission and reception use different lines, and each subnet access port has an independent number and an independent interrupt number.
The IP transmission multiplexer A (or the IP transmission multiplexer B) receives data, multiplexes a data packet according to a port number, the multiplexed IP message carries a port number information field of a data source, the data packet is sent to a channel for transmission after multiplexing is completed, the IP transmission multiplexer B (or the IP transmission multiplexer A) receives the data packet transmitted from the channel and directly distributes the data to a subnet access port with a corresponding number according to the port number information carried by the IP message, and therefore transmission multiplexing and demultiplexing of the IP transmission multiplexer are completed.
Another objective of the present invention is to provide a method for multiplexing and demultiplexing IP transmission, which includes the following steps:
receiving data of each access sub-network;
multiplexing data packets according to port numbers, namely, sending the data packets to a channel for transmission after multiplexing is completed even if the multiplexed IP message carries the port number information field of a data source;
and receiving a data packet transmitted from the channel, demultiplexing the data packet, and then distributing the data to the subnet access port with the corresponding number according to the port number information carried by the IP message.
Preferably, when multiplexing the data packet, the IP packet is modified to make the multiplexed IP packet carry the port number information of the data source, so as to implement network isolation for multiplexing and demultiplexing.
Furthermore, the IP packet is modified by adding a multiplexing type field and a multiplexing control field in the IP packet, the content of the multiplexing control field includes port number information, and the addition of the multiplexing type field and the multiplexing control field in the IP packet is implemented by the prior art. The data is processed in the transport layer of the OSI system, the format of the original MAC frame is not destroyed, the content of the original IP message is completely reserved, the processing complexity is low, and in the process, the data frame in the channel is added with port number information, so that the overhead is low. When the multiplexing type field is defined as 0X8100, stronger compatibility can be obtained.
Furthermore, the multiplexing control field is self-defined, and besides the port number information, the multiplexing control field contains other information such as whether to segment, whether to segment is the first segment or the last segment, and error correction coding of information. And if the information contains error correction coding information, adopting an extended Hamming code for the error correction coding of the information.
Compared with the prior art, the invention has the beneficial effects that:
the flow direction of the Ethernet multiplexing mode data transmission based on the IP transmission multiplexer is fixed, manual configuration is not needed, data packets in a line are distinguished by port numbers, communication between access network ports is not allowed in terms of realization mechanism, and isolation between networks connected with different ports is realized. Has the following outstanding beneficial characteristics:
(1) the data flow direction is fixed, the user subnets are isolated at a physical layer, and manual configuration connection is not needed between the user subnets, so that the complexity of operation is greatly reduced, and the risk of error caused by manual configuration is avoided;
(2) data is processed at the transmission layer of the OSI system, the format of the original MAC frame is not damaged, the content of the original IP message is completely reserved, and the processing complexity is reduced;
(3) the number information of the port is added to the data frame in the channel, so that the overhead is low;
(4) through the design of the invention, the same accuracy of data transmission by adopting the frame relay type synchronous data transmission equipment can be achieved, and the equipment can be connected with a channel through a network port, so that the problem that the rate is limited to be not more than 9Mbps because the synchronous transmission equipment can only be a parallel port due to the limitation of the realization principle of the equipment is solved, the data transmission can be greatly improved as required, even more than 100Mbps, and the rapid data transmission is realized.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 shows the operation mode and connection diagram of the IP transport multiplexer according to the present invention.
Fig. 2 shows the main hardware structure of the IP transport multiplexers a and B of the present invention.
Fig. 3 shows a basic frame structure of an ethernet signal after data multiplexing according to the method of the present invention.
Fig. 4 shows an example of a multiplexing type field and a multiplexing control field added in an IP packet according to the method of the present invention.
Detailed Description
Specific embodiments of the present invention will be described below.
Incidentally, common or well-known techniques in the art are applied to a part of the present invention, and are not particularly illustrated or described in the specification of the present invention.
Furthermore, the embodiments described below are only examples of the present invention, and the present invention is not limited to these embodiments.
Fig. 1 shows an operating mode of an IP transport multiplexer, where the IP transport multiplexer includes an IP transport multiplexer a and an IP transport multiplexer B, and the IP transport multiplexers must be used in pairs in application, and the IP transport multiplexer a and the IP transport multiplexer B connect channels through network ports to complete data multiplexing and demultiplexing processes of channel bidirectional communication, and implement isolated transmission when service data of several accessed ethernet subnets share a channel.
Fig. 2 shows the main hardware structure of the IP transport multiplexers a and B. Mainly comprises a back board unit, an indicator light unit, an Ethernet interface unit, a main control unit and a power supply unit, wherein,
the Ethernet interface unit comprises the subnet access ports with different numbers and a relay port connected with the channel side equipment, when the transmission multiplexer is used as a multiplexing end, the subnet access port is used for receiving Ethernet subnet data and then sending the data to the main control unit, and the relay port is used for sending a data packet multiplexed by the main control unit to a channel; when the transmission multiplexer is used as a demultiplexing end, the relay interface is used for receiving a data packet transmitted from a channel and then transmitting the data packet to the main control unit, and the subnet access port is used for transmitting data after the main control unit is demultiplexed to the Ethernet subnet;
the main control unit is used for receiving the data sent by the Ethernet interface unit, caching, scheduling and controlling the flow of the data, and sending the data back to the Ethernet interface unit after multiplexing or demultiplexing the data;
a power supply unit for supplying power;
the main control unit and the Ethernet interface unit are respectively inserted into corresponding positions of the backboard unit and are connected through a PCI bus of the backboard unit;
and the indicator light unit is used for displaying the equipment state.
The structure of the IP transport multiplexers a and B as above preferably adopts the CPCI architecture.
In order to ensure good isolation between the sub-networks, each sub-network access port on the Ethernet interface unit is provided with an independent interface transformer and an independent input/output buffer memory, and no Ethernet sub-network access port has shared resources in hardware design;
furthermore, 4 transmission lines are provided between each subnet access port and the main control unit on the ethernet interface unit, wherein 2 lines are used for data transmission, and 2 lines are used for data reception, so that the data transmission and the data reception have respective lines, and the condition that the same ethernet subnet access port transmits and receives data to share resources does not exist; meanwhile, each subnet access port has an independent number and an independent interrupt number, so that the main control unit can independently operate each path of Ethernet subnet access port.
The working principle is as follows: the IP transmission multiplexer A (or the IP transmission multiplexer B) receives data at a user side interface, namely each subnet access port, through an Ethernet port unit of the IP transmission multiplexer A, then transmits the data to a main control unit through a PCI data bus of a back panel unit, the main control unit multiplexes the received data according to ports, so that the multiplexed IP message carries port number information of a data source, the IP message is sent to a channel for transmission after multiplexing is completed, the IP transmission multiplexer B (or the IP transmission multiplexer A) receives the data packet transmitted from the channel through an Ethernet port unit of the IP transmission multiplexer B, the main control unit directly distributes the received IP message to access port subnets which are correspondingly numbered on the Ethernet port unit according to the port number information carried by the IP message, and transmission multiplexing and demultiplexing of the IP transmission multiplexer are completed.
In short, the ethernet interface unit of the IP transport multiplexer receives ethernet data, and the data enters the main control unit for buffering, scheduling and flow control. In the data processing performed by the main control unit, the known prior art is used in the communication processing of the present invention, and in addition, the multiplexing and the demultiplexing are improved, so that the multiplexed IP packet carries the port number information field of the data source, specifically, the improvement is implemented as follows:
the method for multiplexing and de-multiplexing of IP transmission multiplexer is to modify IP message to realize network isolated multiplexing connection, so that the modified IP message not only carries port number information, but also conforms to IP message standard structure. In this embodiment, the multiplexing control is implemented by adding a multiplexing type field and a multiplexing control field, and the content of the multiplexing control field includes port number information. Fig. 3 shows a basic frame structure of an ethernet signal after multiplexing of data according to the method of the present invention.
Because the modified IP packet length is increased by 4 bytes, and the IP packet length with the maximum length may exceed the allowable range, and the IP packet may be segmented, the added field should be defined reasonably, and preferably, the added field should include the following information:
(1) the multiple connection type is defined as 0X 8100;
(2) the multiplexing control is self-defined and comprises information such as port numbers, whether segmentation is carried out on the first segment or the last segment, error correction coding of the information and the like.
Fig. 4 shows an example of the multiplexing type field and the multiplexing control field added in the IP packet according to the method of the present invention
In order to avoid that the multiplexing control field is changed after the channel is interfered, the digital signal transmission has an error code, 1 will become 0, thereby causing the control field error, for example, 001 becomes 010, then 1 will become 2, the data will be sent to 2 ports, thereby causing the received data to be incorrectly sent to other ports, and error correction coding is added in the multiplexing control field. In the design, the multiple connection control fields of 2 bytes are respectively subjected to error correction coding, the first 4 bits of each byte are effective information bits, and the last 4 bits are error correction coding.
In this embodiment, the error correction coding of the multiplexing control field is implemented by using an extended hamming code. The Hamming code is a linear block code, the information bit of (7,4) Hamming code is 4 bits, the supervisory bit is 3 bits, the code distance is 3, therefore, the Hamming code (7,4) can correct single bit error, when 2bit errors occur in one code word, the error correcting action can occur. The extended Hamming code carries out parity check on the whole Hamming code to realize the functions of error correction and error detection. The capability of extending the hamming code to correct and detect errors is improved to correct 1-bit errors or detect 2-bit errors at the same time.
The extended hamming code is implemented by extending the (7,4) hamming code into the (8,4) code by adding an overall parity bit, and the 8 th bit is even parity to the first 7 bits. The code word received by the decoder comprises 4 information bits, 3 parity bits and 1 parity check bit; whether the received supervision bit and the check bit are wrong or not is judged by calculating and analyzing the received supervision bit and the check bit.
Error correction coding can realize 1-bit error correction and 2-bit error detection for every 8-bit data. For a transmission system with a system error rate of 1 x 10-5, error correction coding is added to ensure that the multiplexer does not forward data packets to other user interfaces due to errors in the multiplexing control field.
The IP transport multiplexer in the previous embodiment is implemented by a combination of hardware and software. Hardware is not limited to the configuration described in the embodiment, and those skilled in the art will appreciate that various modifications, combinations, substitutions and alterations depending on design requirements and other factors of the present invention are within the scope of the appended claims and equivalents thereof.
Claims (10)
1. An IP transmission multiplexer is characterized by comprising an IP transmission multiplexer A and an IP transmission multiplexer B which have the same structure, are used in pairs and are correspondingly arranged at two ends of a channel, and data can be transmitted in two directions between the IP transmission multiplexer A and the IP transmission multiplexer B; the IP transmission multiplexer A comprises a plurality of ports accessed by the sub-networks, and each port has a different port number; the IP transmission multiplexer B comprises ports which are accessed by subnets with the same number and the same number as the IP transmission multiplexer A; wherein, when data is transmitted from the IP transport multiplexer A to the IP transport multiplexer B,
the IP transmission multiplexer A is used for receiving the data of each access subnet and multiplexing the data packets according to the ports, the multiplexed IP message carries the port number information of the data source, and the data packets are sent to the channel for transmission after the multiplexing is finished;
the IP transmission multiplexer B is used for receiving the data packet transmitted from the channel, performing demultiplexing on the data packet, and then distributing the data to the subnet access port with the corresponding number according to the port number information carried by the IP message;
when data is transmitted from the IP transmission multiplexer B to the IP transmission multiplexer A, the functions of the IP transmission multiplexer A and the IP transmission multiplexer B are exchanged;
the IP transmission multiplexer A and the IP transmission multiplexer B are connected with the channel through the network port.
2. The IP transport multiplexer of claim 1, wherein: when multiplexing the data packet, the IP message is modified to make the multiplexed IP message carry the port number information of the data source.
3. The IP transport multiplexer of claim 2 wherein the IP packet is modified by adding a multiplexing type field and a multiplexing control field to the IP packet, the contents of the multiplexing control field including port number information.
4. The IP transport multiplexer of claim 3 wherein the multiplexing control field contains error correction coding of the information in addition to the port number information, wherein the error correction coding is implemented using extended hamming codes.
5. The IP transport multiplexer of claim 1 wherein the IP transport multiplexer a and the IP transport multiplexer B each mainly comprise a backplane unit, an indicator light unit, an ethernet interface unit, a main control unit, and a power supply unit; wherein,
the Ethernet interface unit comprises the subnet access ports with different numbers and a relay port connected with the channel side equipment, when the transmission multiplexer is used as a multiplexing end, the subnet access port is used for receiving Ethernet subnet data and then sending the data to the main control unit, and the relay port is used for sending a data packet multiplexed by the main control unit to a channel; when the transmission multiplexer is used as a demultiplexing end, the relay interface is used for receiving a data packet transmitted from a channel and then transmitting the data packet to the main control unit, and the subnet access port is used for transmitting data after the main control unit is demultiplexed to the Ethernet subnet;
the main control unit is used for receiving the data sent by the Ethernet interface unit, caching, scheduling and controlling the flow of the data, and sending the data back to the Ethernet interface unit after multiplexing or demultiplexing the data;
a power supply unit for supplying power;
the main control unit and the Ethernet interface unit are respectively inserted into corresponding positions of the backboard unit and are connected through a PCI bus of the backboard unit;
and the indicator light unit is used for displaying the equipment state.
6. The IP transmission multiplexer of claim 5 wherein each subnet access port on the Ethernet interface unit has an independent interface transformer and an independent input/output buffer, the transmission line between each subnet access port and the main control unit on the Ethernet interface unit uses different lines for data transmission and reception, and each subnet access port has an independent number and an independent interrupt number.
7. A method for multiplexing and demultiplexing IP transmission is characterized by comprising the following steps:
receiving data of each access sub-network;
multiplexing data packets according to ports, carrying port number information of a data source by the multiplexed IP message, and sending the data packets to a channel for transmission after multiplexing is completed;
and receiving a data packet transmitted from the channel, demultiplexing the data packet, and then distributing the data to the subnet access port with the corresponding number according to the port number information carried by the IP message.
8. The method according to claim 7, wherein the multiplexing and demultiplexing of the data packets is performed by modifying the IP packets so that the multiplexed IP packets carry the port number information of the data source.
9. The method according to claim 8, wherein the IP packet is modified by adding a multiplexing type field and a multiplexing control field in the IP packet, and the contents of the multiplexing control field include port number information.
10. The method of claim 9, wherein the multiplexing control field further comprises error correction coding of information in addition to the port number information, wherein the error correction coding is implemented by using extended hamming codes.
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