CN101184098B - Data transmission method and transmission apparatus - Google Patents

Abstract

The embodiment of the present invention discloses a data transmission method, comprising: acquiring the payload part of the data frame to be converted; adding the HOM frame header to the acquired payload part at the data link layer to form a HOM single frame, and the HOM frame header Contains message type and payload length; carries multiple HOM single frames as payloads in Ethernet frames, and sends the Ethernet frames to the destination according to routing information. The embodiment of the present invention also provides a data transmission method: receiving an Ethernet frame composed of a HOM single frame and a HOM multiframe as a payload, and the HOM single frame is composed of adding a HOM frame header to the payload part of the data frame to be converted; Separate the HOM single frame according to the number of HOM single frames, read the payload part of each HOM single frame and restore it to the data frame before conversion. Correspondingly, the embodiment of the present invention also provides a data transmission device. The technical solutions provided by the embodiments of the present invention can improve data transmission efficiency.

Description

Data transmission method and transmission device

technical field

The invention relates to the field of communication technology, in particular to a data transmission method and a transmission device.

Background technique

In the current data communication, there are various transmission protocols. When transmitting data, it generally involves converting the data carried by one link layer protocol into the data of another link layer protocol. During the conversion, the conversion method of the 7-layer protocol model similar to OSI (Open System Interconnect, Open System Interconnect) is generally used to separate the layers, remove the headers of the protocols of each layer, and obtain the required data itself. Another protocol header is added to the data to complete the protocol conversion. For example, HDLC (High Data Link Control, advanced data link control) frames need to be converted into Ethernet frames for transmission, then the HDLC protocol and Ethernet protocol use the upper layer IP (Internet Protocol, Internet Protocol) protocol and other network layer protocols for transit , to convert the link layer protocol, and finally convert an HDLC frame into an Ethernet frame before transmission.

During the research and practice of the prior art, the inventor has found that the prior art has the following problems: under the data transmission mode of the prior art, for example, the HDLC frame carried in the HDLC point-to-point link is converted into an HDLC frame on the Ethernet link When the Ethernet frame is transmitted on the Internet, when the actual transmission data payload length in the HDLC frame is relatively short (such as a few bytes to hundreds of bytes), the length of the transmitted data is much smaller than that of the Ethernet link layer Ethernet The MTU (Maximum Transmission Unit, maximum transmission unit) length of the frame (1500 bytes), and when the number of data frames to be transmitted is large, the transmission efficiency of Ethernet will be very low, which will greatly waste the system's CPU (Central Processing Unit, CPU) processing power.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a data transmission method and a transmission device, which can improve data transmission efficiency.

In order to solve the above technical problems, the embodiments provided by the present invention are achieved through the following technical solutions:

An embodiment of the present invention provides a data transmission method, comprising: obtaining the payload part of the data frame to be converted; adding a HOM frame header to the obtained payload part at the data link layer to form a HOM single frame, and the HOM frame header Contains message type and payload length; carries multiple HOM single frames as payloads in Ethernet frames, and sends the Ethernet frames to the destination according to routing information.

An embodiment of the present invention provides a data transmission method, comprising: receiving an Ethernet frame composed of a HOM single frame and a HOM multiframe as a payload, and the HOM single frame is formed by adding a HOM frame header to the payload part of the data frame to be converted ; Separate the HOM single frame according to the number of the HOM single frame, read the payload part of each HOM single frame and restore it to the data frame before conversion.

An embodiment of the present invention provides a data transmission device, including: a first processing unit, configured to obtain the payload portion of the data frame to be converted; a second processing unit, configured to obtain the first processing unit at the data link layer The payload part adds a HOM frame header to form a HOM single frame, and the HOM frame header contains a message type and a payload length; the third processing unit is used to use a plurality of HOM single frames obtained by the second processing unit as a net The payload is carried in the Ethernet frame, and the Ethernet frame is sent to the destination end according to the routing information.

An embodiment of the present invention provides a data transmission device, including: a receiving unit, configured to receive an Ethernet frame composed of a HOM single frame and a HOM multiframe as a payload, and the HOM single frame consists of the payload part of the data frame to be converted The HOM frame header is added; the processing unit is used to separate the HOM single frame according to the number of the HOM single frame, read the payload part of each HOM single frame and restore it to the data frame before conversion.

It can be seen from the above technical solution that the technical solution of the embodiment of the present invention composes the data frame to be converted into a HOM single frame at the data link layer, and multiplexes the HOM single frame as a payload in an Ethernet frame for multiplexing Transmission, thus making full use of the MTU length of the Ethernet frame, greatly improving the data transmission efficiency of the Ethernet. At the same time, because the conversion can be realized at the same data link layer, it is not necessary to use other layer protocols for conversion as in the prior art, so it is simpler.

Description of drawings

Fig. 1 is a flowchart of a data transmission method according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of the HOM single frame format proposed by the embodiment of the present invention;

Fig. 3 is a schematic diagram of the frame header format of the HOM single frame proposed by the embodiment of the present invention;

FIG. 4 is a schematic diagram of a HOM multiframe format proposed by an embodiment of the present invention;

Fig. 5 is the HOM type Ethernet frame format schematic diagram that the embodiment of the present invention proposes;

Fig. 6 is a schematic diagram of a scheme of application example 1 of the present invention;

Fig. 7 is a schematic diagram of the second scheme of the application example of the present invention;

FIG. 8 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention;

Fig. 9 is a schematic diagram of the structure of the second data transmission device according to the embodiment of the present invention.

Detailed ways

An embodiment of the present invention provides a data transmission method, which can improve data transmission efficiency.

The embodiment of the present invention proposes a HOM (HDLC OVER MAC, HDLC message message is carried on the MAC (Media Access Control, media access control) layer) single frame and HOM multi-frame, according to the HOM single frame and HOM multi-frame will need to convert Data frames are converted into HOM-type Ethernet frames and then transmitted via Ethernet, thereby improving data transmission efficiency. In the embodiment of the present invention, the data frame to be converted is illustrated by an HDLC frame, but is not limited thereto, for example, it may be a data frame in a PPP (Point to Point Protocol, point-to-point protocol).

Please refer to Fig. 1, which is a flowchart of a data transmission method according to an embodiment of the present invention, including steps:

Step 101, converting the HDLC frame into a HOM single frame;

The HDLC frame is received from the HDLC point-to-point link at the data link layer, the data payload in the HDLC frame is separated from other parts, and only the data payload part is reserved, and the data payload part is obtained. Then add a HOM frame header to the data payload part in the HDLC frame to form a HOM single frame.

The HOM single frame proposed by the embodiment of the present invention will be described in detail below.

Please refer to FIG. 2 , which is a schematic diagram of the HOM single frame format proposed by the embodiment of the present invention.

HOM single frame (HOM Frame), including frame header field (HOM Head), HOM payload field (HOMPayLoad) and padding field (PAD).

Among them, the HOM single-frame padding domain (PAD) is optional, and it can be decided whether to reserve this domain according to different CPUs. On a 32-bit CPU, for the convenience of CPU addressing, each HOM single frame starts from an even address. Here, HOM PayLoad can be filled with 0-3 bytes for long word (four-byte) alignment.

Please refer to FIG. 3 , which is a schematic diagram of the frame header format of the HOM single frame proposed by the embodiment of the present invention. The frame header of the HOM single frame contains the management information of the HOM single frame, including: the destination HDLC link number Peer Link ID of the peer end, the source HDLC link number Local Link ID of the local end, the message type HOM Type, and the payload length Len.

For details, please refer to Table 1 below.

Bit Bit name describe LW0:31:16 Peer Link ID Identify the physical (virtual) link number of the peer protocol LW0:15:0 Local LinkID Identify the physical (virtual) link number of the local protocol LW1: 31:16 HOM Type The type of HOM message is defined as follows: 0x0000: Reserved 0x0001: Data message 0x0002: Back pressure request message 0x0003: Back pressure response message Others: Reserved LW1: 15:0 Len The length of the HOM frame payload, excluding the length of the HOM header and the length of padding added for long word alignment

Table 1

In step 101, the destination HDLC link number of the opposite end can be obtained by searching the pre-established routing table, and the source HDLC link number of the local end and the destination HDLC link number of the opposite end can be filled into the frame header of the HOM single frame. Because the routing table at least includes: the source HDLC link number of the local end; the source MAC address of the local end; the destination MAC address of the peer end; and the destination HDLC link number of the peer end. The establishment of the routing table can be completed by using the IP protocol or other protocols for handshake communication. Because the source HDLC link ID of the local end is known, and there is a one-to-one correspondence between the source HDLC link ID of the local end and the destination HDLC link ID of the peer end, the peer HDLC link ID can be found in the routing table based on the source HDLC link ID of the local end. Destination HDLC link number, and fill the frame header of the HOM single frame with the source HDLC link number of the local end and the destination HDLC link number of the remote end.

Step 102, forming a HOM single frame into a HOM multiframe;

Multiple HOM single frames in the above mode are connected together, and the frame header of the HOM multiframe is added to form a HOM multiframe.

Please refer to FIG. 4 , which is a schematic diagram of the HOM multiframe format proposed by the embodiment of the present invention.

A HOM multiframe (HOM MultiFrame) consists of a frame header of a HOM multiframe and multiple HOM single frames.

The frame header of the HOM multiframe includes the HOM single frame total number (HOM NUMBER) field and the payload total length (HOM LENGTH) field of all HOM single frames.

The HOM NUMBER field indicates the number of HOM single frames included in the HOM multiframe; the HOMLENGTH field is the sum of the payload lengths of all HOM single frames in the HOM multiframe, including the payload length of the HOM frame and padding to ensure long word alignment length.

A HOM multiframe can contain multiple HOM single frames. There is no limitation on the number and length of HOM single frames in HOM multiframes. In the HOM multiframe, the boundary of the entire frame is determined according to the length field in the HOM single frame header, that is, a HOM single frame is determined by adding the value in the length field in the HOM single frame header to the HOM single frame header frame range. It should be noted that when determining the range of a single HOM frame here, it may be determined whether to add a PAD field according to needs.

Step 103, forming the HOM multiframe into an Ethernet frame;

Add an Ethernet frame header to the HOM multiframe to form a HOM type Ethernet frame.

In order to form HDLC frames into a group of multiframes and transmit them on Ethernet to realize HDLC OVERMAC, the embodiment of the present invention adds a HOM type Ethernet frame on the basis of Ethernet protocol 802.1Q, and HOM multiframes are used as Ethernet The payload of the frame is carried on it.

Please refer to FIG. 5 , which is a schematic diagram of the HOM type Ethernet frame format proposed by the embodiment of the present invention.

The HOM type Ethernet frame includes: Ethernet frame header field, HOM multiframe field, PAD field (optional), FCS (Frame Check Sequence, frame check sequence) field.

Among them, the frame header field of the Ethernet frame includes the following contents:

DA domain (Destination MAC, destination media access control address); SA domain (Source MAC, source media access control address); Tag domain, four-byte 802.1Q tag header; Type domain, the packet type.

Tag includes 2-byte TPID (Tag Protocol Identifier, tag protocol identifier) and 2-byte TCI (Tag Control Information, tag control information). TPID is a new type defined by IEEE (Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers), indicating that this is an 802.1Q tagged frame. TPID contains a fixed value 0x8100. TCI contains frame control information, including the following elements: priority Priority, CFI (Canonical Format Indicator, canonical format indicator), VLAN ID (VLAN Identified, virtual local area network identification). Priority, the length is 3bits, which indicates the priority of the frame. There are 8 priorities in total, that is, priority 0-7; CFI, the length is 1bit, and the value of CFI is 0, indicating that it is a standard format, and 1 is a non-standard format. CFI is used In the Token Ring/Source Routing FDDI medium access method to indicate the bit sequence information of the address in the encapsulated frame; VLAN ID, the length is 12 bits, indicating the ID of the VLAN, a total of 4096, each switch supporting the 802.1Q protocol The data packets sent out include this field to indicate which VLAN (Virtual Local Area Network) it belongs to.

The definition of the Type domain field is as follows: 0x0800, indicating the IP type; 0x0806, indicating the ARP type; 0x0F20, indicating the HDLC over MAC type Ethernet frame, referred to as the HOM type Ethernet frame. Here, the Type value of 0x0F20 is used to indicate the HOM type Ethernet frame, and other values can also be selected according to actual needs.

The PAD field is optional. When the total length of the Ethernet frame is less than 64 bytes, the PAD field needs to be filled until the total length reaches 64 bytes to ensure that the minimum length of the Ethernet frame is met.

In this step 103, search the pre-established routing table, find out the destination MAC address of the opposite end by the source HDLC link number and the source MAC address of the local end, and fill the source MAC address of the local end and the destination MAC address of the opposite end into the Ethernet frame in the frame header.

It should be noted that the Ethernet frame described here is an example of an Ethernet frame with a Tag field but is not limited thereto. For an Ethernet frame without a Tag field, its composition principle is the same.

Step 104: Send the Ethernet frame according to the routing information.

After the HOM type Ethernet data frame is formed, it is transmitted to another system through Ethernet. The HOM type Ethernet data frame already includes routing information: the source HDLC link number of the local end; the source MAC address of the local end; the destination MAC address of the peer end; the destination HDLC link number of the peer end. The network sends the Ethernet frame.

After the opposite end receives the Ethernet frame, it separates the Ethernet frame and restores it into an HDLC frame, that is, performs a reverse conversion process: Ethernet frame -> HOM multiframe -> HOM single frame -> HDLC frame. The reverse conversion process needs to separate the frame headers layer by layer. First, separate the Ethernet frame headers, and then separate the HOM single frames from the multiframes one by one according to the total number of HOM single frames in the HOM multiframe and the payload length of the HOM single frame. separated out.

Before reading the data, add the payload lengths in all HOM single frames and the total length of the HOM payloads in the HOM multiframe frame header to check the length. Read out one by one from a single frame, and finally restore it to an HDLC frame, and send the HDLC frame to the destination according to the HDLC link number of the opposite end.

Through the above method, carrying multiple HOM single frames converted from HDLC frames in one Ethernet frame can make full use of the MTU length of the Ethernet frame and greatly improve the transmission efficiency, and the HDLC frame and the HOM type Ethernet frame are in the same The data link layer can be converted without using other layer protocols for conversion, which is also simpler.

Specific application examples of the present invention are introduced in detail below.

Please refer to FIG. 6 , which is a schematic diagram of a scheme of an application example 1 of the present invention.

In the communication system shown in Figure 6, there are the following application scenarios. There are multiple HDLC point-to-point links between system A and system C, multiple HDLC point-to-point links between system B and system D, and in system A Ethernet is used for transmission with system B.

In this application scenario, there are multiple HDLC links between system A and system C, and between system B and system D, and the HDLC frames transmitted between them are relatively short in length and large in number. Ethernet can be used for transmission between the system and the B system. At this moment, just can utilize the technical scheme that the embodiment of the present invention provides, the data payload part after the data payload in the HDLC frame is separated from other parts forms HOM single frame, forms HOM multiframe by a plurality of HOM single frames, for The HOM multiframe adds an Ethernet frame header to form an Ethernet frame, and then transmits it, which can increase the transmission bandwidth between A and B systems, thereby greatly improving the data transmission efficiency between systems. For example, system A receives the HDLC frame sent by system C through the HDLC link, separates the data payload in the HDLC frame from other parts to form a HOM single frame, and combines multiple HOM single frames to form a HOM multiframe. The HOM multiframe adds an Ethernet frame header to form an Ethernet frame, and then transmits it to system B through Ethernet according to the destination MAC address. After receiving the Ethernet frame, system B separates the Ethernet frame header, and then according to the HOM multiframe The total number of HOM single frames and the length of the payload of the HOM single frame, separate the HOM single frame from the multiframe one by one, read the data payload of the HDLC frame from the HOM single frame one by one, and finally restore it to HDLC frame, through HDLC The link is transmitted to the D system.

It should be noted that there is a two-way transmission process between the systems in the figure, and the above is only described by taking the direction from system C to system D as an example, and the principle of the reverse transmission process is the same. During reverse transmission, system B performs the process of converting HDLC frames into Ethernet frames, and system A performs the process of restoring Ethernet frames into HDLC frames.

Please refer to FIG. 7 , which is a schematic diagram of the second application example of the present invention.

As shown in Figure 7, in GSM (Global System for Mobile Communications, Global System for Mobile Communications), there are A processing unit and A' processing unit in the BSC (Base Station Controller, base station controller) controller system. A processing unit is used as an interface processing unit directly connected to other single boards to connect to B, C, D...N, N+1 base station systems respectively through HDLC links.

In the original design scheme of the existing technology, there is only A processing unit. When A processing unit receives the data sent by B, C, D...N, N+1 systems, it sends it to the application layer for data processing. The disadvantage of this solution is that when the number of other systems connected to the A processing unit increases, the data that the A processing unit needs to transmit to each system through the HDLC link and to the application layer for processing will increase proportionally. When the number of base stations increases When it is large enough, the A processing unit will also become the bottleneck of the whole system, limiting the ability of the BSC to expand and connect to the base station. However, in the second scheme of the embodiment of the present invention, the scheme of adopting A processing unit and A' processing unit to replace the original A processing unit in the BSC controller system, the A processing unit only retains the main function of the interface processing unit, and separates The A' processing unit is responsible for processing the data of the original application layer. After the A processing unit receives the HDLC frame through the HDLC link, it takes the payload of the HDLC frame to form a HOM single frame, forms multiple HOM single frames into a HOM multiframe, and adds an Ethernet frame header to the HOM multiframe to form an Ethernet frame. , according to the destination MAC address and transmitted to the A' processing unit through Ethernet. After receiving the Ethernet frame, the A' processing unit separates the Ethernet frame header, and then separates the HOM single frame from the multiframe one by one according to the total number of HOM single frames in the HOM multiframe and the payload length of the HOM single frame, Finally, the HOM single frame header is separated, leaving only the HDLC payload, which is handed over to the application layer for processing. In this way, the data that originally needs to be processed by the A processing unit is transferred to the A' processing unit, so that the function of the A processing unit is simplified, and its ability as an interface processing unit is improved, and the original bottleneck problem is solved. , which improves the transmission performance of the whole system.

It should be noted that in application example 1, the HDLC links of system A and system B exist physically. When maintaining the routing table, only the HDLC link numbers and MAC addresses of the local end and the peer end need to be filled in the routing table. In the second application example, since there is no HDLC physical link in the A' processing unit, a virtual HDLC link of the A' processing unit can be virtualized at this time, and the physical HDLC link of the A processing unit and the A' processing unit Associate the virtual HDLC link of A to fill in the routing table, and also fill in the routing table with the MAC address of A processing unit and the MAC address of A' processing unit, and establish a connection between A and A' processing unit through Ethernet.

The above content introduces the data transmission method of the embodiment of the present invention in detail, and correspondingly, the embodiment of the present invention provides a data transmission device.

Please refer to FIG. 8 , which is a schematic structural diagram of a data transmission device according to an embodiment of the present invention.

As shown in FIG. 8 , the data transmission device includes a first processing unit 81 , a second processing unit 82 and a third processing unit 83 .

The first processing unit 81 is configured to obtain the payload part of the data frame to be converted. Assuming that the data frame needs to be converted into an HDLC frame, after receiving the HDLC frame from the HDLC point-to-point link, the first processing unit 81 separates other parts of the HDLC frame, and only keeps the data payload part.

The second processing unit 82 is configured to add a HOM frame header to the payload part acquired by the first processing unit 81 at the data link layer to form a HOM single frame. Each HOM single frame includes a frame header field (HOMHead), a HOM payload field (HOM PayLoad) and a padding field (PAD), where the padding field is optional. The payload part of the data frame to be converted obtained by the first processing unit 81 is used as the HOM payload of the HOM single frame. The frame header of the HOM single frame contains the management information of the HOM single frame, including: the destination HDLC link number Peer Link ID of the peer end, the source HDLC link number Local Link ID of the local end, the type HOM Type, and the payload length Len.

The third processing unit 83 is configured to carry the multiple HOM single frames obtained by the second processing unit 82 as payloads in the Ethernet frame, and send the Ethernet frame to the destination according to the routing information.

The third processing unit 83 specifically forms a plurality of HOM single frames into a HOM multiframe as a payload and carries it in an Ethernet frame. A HOM multiframe (HOM MultiFrame) consists of a frame header of a HOM multiframe and multiple HOM single frames. The frame header of the HOM multiframe includes the HOM single frame total number (HOMNUMBER) field and the payload total length (HOM LENGTH) field of all HOM single frames.

The Ethernet frame mentioned here refers to a HOM type Ethernet frame, including: an Ethernet frame header field, a HOM multiframe field, a PAD field (optional), and an FCS field. Wherein, the Ethernet frame header domain includes the following contents: DA domain (Destination MAC, destination MAC address); SA domain (Source MAC, source MAC address); Tag domain, the 802.1Q tag header of four bytes; Type domain, That is, the message type. The Type domain field adopts 0x0F20, indicating HDLC over MAC type Ethernet frame, referred to as HOM type Ethernet frame. The PAD field is optional. When the total length of the Ethernet frame is less than 64 bytes, the PAD field needs to be filled until the total length reaches 64 bytes to ensure that the minimum length of the Ethernet frame is met.

The routing information in the Ethernet frame includes: the source HDLC link number of the local end; the source MAC address of the local end; the destination MAC address of the peer end; and the destination HDLC link number of the peer end. When transmitting via Ethernet, it is transmitted according to the destination MAC address of the opposite end, and when transmitting through an HDLC link, it is transmitted according to the destination HDLC link number of the opposite end.

Please refer to FIG. 9 , which is a schematic structural diagram of a second data transmission device according to an embodiment of the present invention.

As shown in FIG. 9 , the data transmission device includes: a receiving unit 94 and a processing unit 95 .

The receiving unit 94 is used to receive the Ethernet frame sent by the sending end. The Ethernet frame is composed of a plurality of HOM single frames into a HOM multiframe as a payload bearer, and the HOM single frame is composed of the payload part of the data frame to be converted Add HOM frame header composition. Each HOM single frame includes frame header field (HOM Head), HOM payload field (HOM PayLoad) and padding field (PAD), where the padding field is optional.

The processing unit 95 is configured to separate a plurality of HOM single frames according to the number of HOM single frames, read the payload part of each HOM single frame and restore it to a data frame before conversion.

The processing unit 95 includes: a separating unit 951 , a checking unit 952 and a restoring unit 953 .

The separation unit 951 is configured to separate multiple HOM single frames according to the number of HOM single frames.

The verification unit 952 is configured to add the payload lengths of all the HOM single frames separated by the separation unit 951 to the total length of the payload identified by the frame header of the HOM multiframe in the Ethernet frame.

The restoration unit 953 is configured to read the payload part of each HOM single frame and restore it to the data frame before conversion when the verification result of the verification unit 952 is the same length.

To sum up, in the technical solution of the embodiment of the present invention, the data frames to be converted are formed into a HOM single frame at the data link layer, and multiple HOM single frames are carried as payloads in Ethernet frames for multiplexing transmission, Therefore, the MTU length of the Ethernet frame is fully utilized, and the data transmission efficiency of the Ethernet is greatly improved. At the same time, because the conversion can be realized at the same data link layer, it is not necessary to use other layer protocols for conversion as in the prior art, so it is simpler.

Further, in the technical solution of the embodiment of the present invention, when the destination end receives the Ethernet frame, multiple HOM single frames can be separated according to the number of HOM single frames, and the payload part of each HOM single frame can be read and converted into previous data frame.

A data transmission method and a transmission device provided by the embodiment of the present invention have been introduced in detail above. For those skilled in the art, according to the idea of the embodiment of the present invention, there will be changes in the specific implementation and application scope. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (11)

1. A data transmission method, characterized in that, comprising: Obtain the payload part of the data frame to be converted; At the data link layer, the payload part of the acquisition is added to the high-level data link control message message and carried on the media access control layer HOM frame header to form a HOM single frame, and the HOM frame header contains message type and payload length; Composing a plurality of HOM single frames into a HOM multiframe as a payload in an Ethernet frame, and sending the Ethernet frame to the destination according to routing information. 2. The data transmission method according to claim 1, characterized in that: Adding the HOM frame header to the obtained payload part further includes adding padding fields to form a HOM single frame. 3. The data transmission method according to claim 1 or 2, characterized in that: The frame header of the HOM multiframe includes the number of HOM single frames and the total payload length of all HOM single frames. 4. The data transmission method according to claim 1, characterized in that: The routing information includes the source link number and source MAC address of the local end, and the destination link number and destination MAC address of the opposite end. 5. The data transmission method according to claim 1, characterized in that: The data frame to be converted is an advanced data link control HDLC frame. 6. A data transmission method, characterized in that, comprising: Receive the Ethernet frame carried by the high-level data link control message message in the media access control layer HOM single frame to form the HOM multiframe as the payload, and the HOM single frame is added with the HOM frame header by the payload part of the data frame to be converted composition; Separate the HOM single frame according to the number of HOM single frames, read the payload part of each HOM single frame and restore it to the data frame before conversion. 7. The data transmission method according to claim 6, characterized in that: After the HOM single frame is separated according to the HOM single frame number, it further includes: After adding the payload lengths of all separated HOM single frames, check with the total payload length identified by the frame header of the HOM multiframe in the Ethernet frame, if they are the same, read the payload lengths of each HOM single frame load part and restore it to the data frame before conversion. 8. A data transmission device, characterized in that it comprises: The first processing unit is used to obtain the payload part of the data frame to be converted; The second processing unit is used to add the payload part obtained by the first processing unit to the high-level data link control message at the data link layer and carry it in the media access control layer HOM frame header to form a HOM single frame, the HOM The frame header contains message type and payload length; The third processing unit is configured to form a plurality of HOM single frames obtained by the second processing unit into a HOM multiframe as a payload and carry it in the Ethernet frame, and send the Ethernet frame to the destination according to the routing information. 9. The data transmission device according to claim 8, characterized in that: The frame header of the HOM multiframe includes the number of HOM single frames and the total payload length of all HOM single frames. 10. A data transmission device, characterized in that, comprising: The receiving unit is used to receive the Ethernet frame carried by the high-level data link control message message in the media access control layer HOM single frame to form the HOM multiframe as the payload, and the HOM single frame is composed of the payload of the data frame to be converted Partially add HOM frame header composition; The processing unit is configured to separate the HOM single frame according to the number of the HOM single frame, read the payload part of each HOM single frame and restore it to the data frame before conversion. 11. The data transmission device according to claim 10, wherein the processing unit comprises: A separating unit is used to separate the HOM single frame according to the number of HOM single frames; A verification unit is used to check the total length of the payload identified by the frame header of the HOM multiframe in the Ethernet frame after adding the payload lengths of all the HOM single frames separated by the separation unit; The restoration unit is used to read the payload part of each HOM single frame and restore it to the data frame before conversion when the verification result of the verification unit is the same length.

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