Dual Plane System Utilizing Dual Transmit and Selective Receive Circuits

Abstract

The invention relates to a dual-plane system using a dual-transmission and selective-reception circuit, which includes two switching network boards and a plurality of service boards, each switching network board is connected to each service board in star form, and each service board is The channel and the backup channel realize the data communication between it and the switching network board, and it is characterized in that the service board includes a dual-send and selective-reception circuit that can be generated for detecting the working status of the main channel and the backup channel, and the dual-send and selective-reception circuit The circuit selects the main channel according to the received handshake frame. The dual-plane system using the dual-transmission and selective-reception circuit of the present invention has short fault detection and switching time, can know whether the backup channel is normal before switching, and can prevent frequent switching of the main and backup channels.

Description

technical field [0001] The invention relates to a dual-plane system, in particular to a dual-plane system constructed by dual-transmission and selective-reception circuits. Background technique [0002] In application systems that require high reliability, dual-plane structures are widely used. figure 1 It is a topology structure diagram of a dual-plane solution in a Gigabit Ethernet (GE) switching network frame. Such as figure 1 As shown, two switching fabric boards 11 are respectively connected with service boards 12 to form two star switching planes. Each service board 12 sends data to two SFUs 11 at the same time when sending data, and only receives data from one of the SFUs 11 when receiving data. When the receiving channel fails, the service board 12 switches to another receiving channel Receive data from another SFU 11, which is dual-send selective reception. [0003] The internal structure of the service board 12 is as follows: figure 2 As shown, it realizes th...

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Problems solved by technology

[0004] However, in the above system, since the link duplication device 23 itself does not have a detection function for link layer data, it is impossible to know whether the working status of another receiving channel is normal before the receiving channel is switched.

When both channels work abnormally, it is easy to cause frequent switching between the two receiving channels

In addition, it takes a long time to detect service channel line faults through software, and the switching time is long, which may lead to a large amount of data loss during switching

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