Master and slave converting method for communication link circuit

Abstract

This invention discloses a master-backup conversion method for a communication links including: setting up master-backup communication channels between local and the opposite ends, each set of which includes a data link for transmitting user data and a communication link for managing data links, setting up communication ports of a physical layer, a transmission thread and a receiving thread, detecting if the communication with the opposite end device is normal, if it is faulty, the local end device enters into a waiting state, detecting the state of the opposite end device again after delaying random time till it is recovered, detecting in advance if the converted link state can meet the conversion condition, then it executes the conversion.

Description

technical field [0001] The invention relates to an active-standby switchover method of a communication link in a communication device, in particular to a method for line redundancy backup in the field of transmission communication. Background technique [0002] In the field of communication, in order to ensure the long-term stable operation of communication equipment, most systems require redundant design in application. When some of the equipment fails, it can jump to the backup unit. In the field of line transmission communication, the weakest link in quality is usually the transmission line, so it is necessary to carry out redundant design for the transmission link. [0003] The current commonly used method is to use two sets of equipment, which are respectively set as the main equipment and the backup equipment. When a failure occurs, switching between the main equipment and the backup equipment is performed. For example, in the Chinese patent 00106113.5 "The main-stand...

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Problems solved by technology

[0004] In the patent 02159089.3 "communication channel master-standby switchover method", it is the switchover of multiple devices. Two communication ports are set for each communication node and a master is constructed between any pair of nodes that establish a communication connection through two sets of switching systems. Communication channel and a backup communication channel; it does not need a centralized communication link to manage nodes, nor does it need to control switching equipment. Although it improves the versatility, it needs to add management equipment other than the main and backup equipment, which increases the cost.

[0005] To sum up, the existing switching methods are limited to switching at the equipment level, ignoring the fact that most faults occur on transmission lines, so such switching design is cumbersome and costly

When the two devices have the same hardware, if they fail at the same time and apply to the other party at the same time, when the application is not confirmed, the request will be canceled at the same time. In this way, the two devices are always in the cycle of application, withdrawal, application and withdrawal , will cause the device to eventually deadlock

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