Path error monitoring method and apparatus thereof

A path error monitoring method is provided for monitoring for an error in a communication path in a synchronous network by using an error detection code inserted into a first predetermined byte in the overhead of transmitted information. The method includes the steps of: performing an error detection code operation for a predetermined range of the transmitted information in a sender side; inserting the obtained error detection code into a second predetermined byte different from the first predetermined byte in the overhead of the transmitted information and sending the inserted transmitted information; performing an error detection code operation for a predetermined range of the inserted transmitted information received in a receiver side; and monitoring for an error in a communication path between the sender side and the receiver side by comparing the obtained error detection code with the second predetermined byte in the inserted transmitted information. Accordingly, even if a redundant communication path is provided in the middle of a communication path, it is possible to determine whether or not there arises an error with respect to only the redundant communication path. As a result, it is possible to avoid an unnecessary path switching operation due to an error in the upper stream to the redundant communication path.