Method for controlling bidirectional line protection switching by using a remote defect indication signal

• US 5,926,102 A
• Filed: 07/11/1997
• Issued: 07/20/1999
• Est. Priority Date: 11/16/1996
• Status: Expired due to Term

• Current Assignee: Electronics and Telecommunications Research Institute, Korea Telecom (KT Corporation)
• Original Assignee: Electronics and Telecommunications Research Institute, Korea Telecom (KT Corporation)
• Inventors: Lee, Yoo-Kyoung, Chun, Kyung-Gyu
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): Beaulieu, Yonel
• Application Number:
  US08/891,494
• Time in Patent Office: 739 Days
• Field of Search: 340/825.16, 340/825.06, 340/825.79, 340/825.8, 340/826, 340/827, 370/223-5, 370/216, 370/7, 359/142, 359/3, 359/147, 379/242, 379/26, 379/258, 379/268
• US Class Current: 340/5.3
• CPC Class Codes: H04J 2203/006 Fault tolerance and recovery
• CPC Class Codes: H04J 3/14 Monitoring arrangements for SDH/SONET rings H04J3/085
• CPC Class Codes: H04L 1/22 using redundant apparatus to increase reliability
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06
• CPC Class Codes: Y10S 379/905 Fax mail

Abstract

A method for controlling bidirectional line protection switching by using a remote defect indication signal. The method includes the following steps of: inserting and transmitting a remote defect indication signal through the opposite directional link, in case the receiving end of working line detects a defect while a traffic is transmitted via a bidirectional link, and then switching to a back-up line by controlling the selector of the receiving station; and switching to the protection line by controlling the selector of the transmitting station, in case the remote defect indication signal is detected via the opposite directional link.

Claims

1. A method for controlling bidirectional line protection switching by using a remote defect indication signal, applied to a transmission system having two stations in which the traffic transmitting end of both a working line and a protection line are bridged over each other, comprising the steps of:

inserting and transmitting a remote defect indication signal through an opposite directional link, in case a receiving end of the working line detects a defect while a traffic is transmitted via a bidirectional link, and then switching to a first protection line by means of controlling a first selector of a first station; and

simultaneously switching to a second protection line by means of controlling a second selector of a second station, in case the remote defect indication signal is detected via the opposite directional link, while a traffic is transmitted via a bidirectional link.