JPH0477028A - Transmission system for local area network - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency of the user data by duplicating transmission lines, duplicating a function up to a data link layer of an OSI reference model, using one transmission line for the transmission of user data and utilizing the other transmission line for the transmission of a control data. CONSTITUTION:A function up to a data link layer for each of stations 2a-2e is duplicated and transmission and reception are simultaneously attained by using transmission lines 1a, 1b. A user data is sent by utilizing the transmission line 1a and a control data is sent by utilizing the transmission line 1b. In the case of sending a user data 4d, the station 2d uses the CSMA/CD access system to make transmission to the transmission line 1a. Then the data received from the transmission line 1a is regarded as a user data and given to a host layer of a network layer. On the other hand, in the case of sending a control data 3c, the station 2c uses the CSMA/CD access system to make transmission to the transmission line 1b. Then the data received from the transmission line 1b is regarded as a control data and it is processed by the network layer.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a communication method in an information network,
In particular, the present invention relates to a transfer method suitable for efficient data transmission using duplex transmission paths.

[Prior Art] A conventional technology will be explained with reference to FIG. In the following explanation, information on layers higher than the network layer of the OSI reference model will be described as user data, and information required by the network layer such as address information and network configuration information will be described as 1lJt.
It is called ll data. In the figure, 2a to 2C are small stages. Each stage accesses its respective transmission path using the C8MA/CD access method. In conventional local area networks, all stations share one transmission path, so all information is transmitted over two transmission paths. Therefore, user data and control data such as address information and management information required by each station on the network are transmitted through the same transmission path. Therefore, in FIG. 3, even if station 2d has user data 4d, it cannot transmit user data 4d while stage dn 2C is transmitting control data 3C. Even in networks with duplex transmission paths, only one of the transmission paths is used when transmitting information, so all information is transmitted over the second transmission path.

[Problem to be solved by the invention] In the above-mentioned conventional technology, since networks are connected by bridges, routers, etc., the scale of the network becomes large (as a result, the tendency to transmit control data such as address information becomes large). This has the disadvantage that it becomes difficult to transmit user data over the entire network, and it appears to the user that the network capacity is low.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to enable efficient transmission of user data even when the scale of the network increases.

1 Means and Effects for Solving the Problems 1 In order to achieve the above object, the present invention duplicates the transmission path and also duplicates the functions up to the data link layer of the O3I reference model at each station of the network. , user data and control data are separated and one transmission path is used to transmit user data and the other transmission path is used to transmit control data, thereby improving the transmission efficiency of user data. It is something that

[Embodiment] FIG. 1 is a network configuration diagram showing an embodiment of the present invention. In the figure, 1a indicates a transmission path for user data, and 1b indicates a transmission path for control data. Each station has duplex functions up to the data link layer □, and can simultaneously transmit and receive data to the transmission paths 1a and 1b. FIG. 2 shows the internal configuration of a station with duplex functions up to the data link layer. It is assumed that each station accesses its respective transmission path using the C8MA/CD access method.

During normal operation, the transmission path 1a is used to transmit 1-the data, and the transmission path 1b is used to transmit control data. User data 4
When transmitting d, station 2d transmits to transmission path 1a according to the C8MA/CD access method.

The data received from the transmission path 1a is regarded as user data and is passed to the upper layer of the network layer. - On the other hand, when transmitting the control data 3C, the station transmits to the transmission path 1b according to the C3MA/CD access method.

Data received from transmission path 1b is regarded as control data,
The network layer processes and reflects the results in the transmission of the data. In FIG. 1, even though station 2C is transmitting control data 3C, station 2d can transmit user data 4d. If one of the transmission lines cannot be used due to a failure or the like, communication is performed using the conventional method of transmitting user data and control data using the other healthy transmission line.

In the above embodiment, the network type is a bus and the access method to the transmission line is the C8MA/CD method, but other network types and access methods may be used. For example, the network configuration may be a ring or loop configuration. Further, the access method to the transmission path may be a token passing method.

[Effects of the Invention] As described above, according to the present invention, ■ User data and control data can be transmitted completely separately in a normal state, so the transmission efficiency of user data can be improved. . Furthermore, since the transmission path is duplicated, communication can be performed using the conventional method even in the event of a failure, which has the effect of increasing the reliability of the network.

[Brief explanation of the drawing]

Figure 1 shows the state of transmission when the functions up to the transmission line and data link layer are duplicated according to the present invention, and Figure 2 shows the inside of the station when the functions up to the transmission line and data link layer are duplicated. A diagram showing the configuration, and FIG. 3 is a diagram showing a conventional transmission method. 1: Transmission line, 1a: Transmission line for user data, 1b 2 Transmission line for control data, 28 to 2e station, 3C control data of station 2C, 4d; 1-the data of station 2d, 5a, 5b: Physical layer, 6a , 6b: data link layer, 7: network layer, 8: upper layer of network layer. Closed 1: Ite 3i, -46□ 2a-2: Stergeon

Claims (1)

[Claims] 1. Duplicate the functions up to the transmission path of the local area network and the data link layer of the OSI reference model, and convert information in layers higher than the network layer to user data, address information, network configuration information, and other information required by the network layer. is used as control data, when the network is in a normal state, user data and control data are separated, one transmission path is used to transmit user data, and the other transmission path is used to transmit control data. , a local area network transmission method characterized in that when a failure occurs, user data and control data are transmitted to a healthy transmission path.