Patent ID: 6463037
Filing Date: 2002-10-08
Classification: H04L

Abstract:
A looping detection apparatus for a communications system in which a node transmits a status enquiry message to a remote node and, when a status enquiry message is received from the remote node, sends back a status response message, to thereby confirm whether normal communication status is established with the remote node, comprising:status enquiry message transmitting means provided in a first node, for transmitting a status enquiry message to a second node with a first identification code carried at a predetermined position of a signal by means of which the status enquiry message is transmitted; status response message returning means provided in the second node, for creating a status response message based on the status enquiry message upon receipt of the status enquiry message, and sending the status response message back to the first node with a second identification code carried at the predetermined position in place of the first identification code; and judging means provided in the first node, for checking an identification code carried at the predetermined position of a signal by means of which a status enquiry message has been transmitted when the status enquiry message is received, and judging that abnormality has occurred in communication status between the second and local nodes if the signal carries the first identification code.