JPH06291771A - Transmission line selection type ethernet - Google Patents

Abstract

PURPOSE:To provide a new transmission line capable of reducing packet collisions and substantially improving transmission efficiency. CONSTITUTION:Two prior bits are secured for route selection in a frame, data are defined as 11, 10, 01 and 00 in the decreasing order of importance and bits are raised on a terminal side. A router looks at it and decides respective inter-router transmission lines for transmitting the data. Also, the data are transmitted for the prior bits in the order and the transmission lines become 3a, 3b, 3c and 3d. The data to be transmitted to the transmission line with the high importance are limited to a certain extent so as to prevent data loss due to the packet collisions and the transmission amount of the data are increased as the importance lowers.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to communication networks, and in particular to Ethernet.

[0002]

2. Description of the Related Art FIG. 3 shows a configuration of a conventional technique. When the number of terminals connected to the network increases, a bridge or a router is used to send out only the necessary data to the transmission line so that the transmission efficiency of the network is not degraded. FIG. 4 shows the structure of the frame in that case. The transmitting terminal 2a adds its own address and the destination address to the data frame. The bridge or router 1a looks at the destination address and, if there is no terminal at the destination address in the router, sends the data to the Ethernet transmission path 3 between the routers.

[0003]

When the amount of information on the transmission path increases, packet collisions frequently occur and packet loss causes a decrease in transmission efficiency.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a novel transmission path selection type Ethernet capable of reducing packet collisions and greatly improving transmission efficiency.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a plurality of Ethernet transmission paths between routers and to determine a transmission path according to the importance of data, thereby significantly improving the transmission efficiency. It is an improvement.

That is, the above object of the present invention is to provide a priority bit for determining the importance of data in a data frame by making a plurality of Ethernet transmission lines between the routers in a network in which the router selects an Ethernet between two terminals. A transmission path selection type Ethernet characterized in that the router selects Ethernet between the routers based on the priority bit, and the priority bit for determining the importance is composed of 2 bits, and between the plurality of routers There are four Ethernet transmission lines, and priority bits are distributed as 40%, 30%, 20%, and 10% of the total data amount from the Ethernet transmission line between routers in which less important data flows in the data frame. The transmission line selection described above characterized in that It is achieved by Ethernet.

[0007]

FIG. 1 is a circuit diagram of an embodiment of a transmission path selection type Ethernet according to the present invention.

Two priority bits are reserved in the frame for route selection between the routers. This prioritized bit is for route selection.
Set to 10, 01, 00, and set bits on the terminal side. The router determines the transmission path for transmitting the data by looking at this priority bit. FIG. 2 shows the frame structure in that case. Further, the prioritized bits distributed according to the importance are sent out in the order of 11, 10, 01, 00. The transmission paths are, for example, 3a, 3b, 3c, 3d. With regard to priority bit addition, it is necessary to prevent data loss due to packet collisions on higher-priority transmission lines, so data sent to high-priority transmission lines is limited to some extent, and data is Increase the amount sent. The amount of data sent is 40%, 30%, 20% of the total amount of data from the transmission line through which less important data flows.
% And 10%, information having a high degree of importance is prevented from being deteriorated in transmission efficiency due to packet collision.

[0009]

Since a plurality of transmission lines are provided by the transmission line selection type Ethernet of the present invention, the transmission speed is 10 Mbps.
In the case of Ethernet, the apparent transmission speed becomes n times higher by providing n transmission lines.

Since the more important data is, the less packet collisions occur, the transmission efficiency of the network is improved.

[Brief description of drawings]

FIG. 1 is a partial circuit diagram of an embodiment of Ethernet of the present invention.

FIG. 2 shows an Ethernet frame format of the present invention.

FIG. 3 is a partial circuit diagram of an example of a conventional Ethernet.

FIG. 4 is a conventional Ethernet frame format.

[Explanation of symbols]

 1, 1a-c Router 2, 2a-c Terminal 3, 3a-d Ethernet transmission line between routers 4, 4a-c Ethernet transmission line in the same router

Claims (2)

[Claims] 1. In a network for selecting an Ethernet between two terminals by a router, a plurality of the Ethernet transmission lines between the routers are provided, a priority bit for determining the importance of data is provided in a data frame, and the priority is set by the router. Transmission line selection type Ethernet characterized by selecting Ethernet between each router based on bits. 2. A priority bit for determining the degree of importance is composed of 2 bits, there are four Ethernet transmission lines between a plurality of routers, and Ethernet transmission between the routers in which less important data flows in a data frame. 2. The transmission path selection type Ethernet according to claim 1, wherein priority bits are distributed from the path to 40%, 30%, 20% and 10% of the total data amount.