公开(公告)号：DE69802495D1

公开(公告)日：2001-12-20

申请号：DE69802495

申请日：1998-12-04

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DENKIN NATHAN MYRON ,  FISHMAN DANIEL A ,  FANG WEI-CHIAO WILLIAM

IPC: G02F1/01 ,  H04B10/00 ,  H04B10/02 ,  H04L1/22 ,  H04M3/22 ,  H04Q3/52 ,  H04B10/08 ,  H04B10/24 ,  H04J14/02

Abstract: A protection facility is provided for use in an optical communications node that communicates with another optical communications node via first and second bi-directional communications paths respectively serving as a service path and protection path, in which a filter filters signals respectively received over the service and protection paths and generates a main signal and a complementary signal for each of the paths. A control unit then generates a Loss of Signal (LOS_A) indication for the service path if a SUM signal or DIFF signal respectively derived as a function of a sum of the main and complementary signals generated for the service path and difference between the main and complementary signals generated for the service path is less than a respective threshold value. A switch then invokes protection switching responsive to the presence of the LOS_A indication.

公开(公告)号：DE69802495T2

公开(公告)日：2002-06-27

申请号：DE69802495

申请日：1998-12-04

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DENKIN NATHAN MYRON ,  FISHMAN DANIEL A ,  FANG WEI-CHIAO WILLIAM

IPC: G02F1/01 ,  H04B10/00 ,  H04B10/02 ,  H04L1/22 ,  H04M3/22 ,  H04Q3/52 ,  H04B10/08 ,  H04B10/24 ,  H04J14/02

Abstract: A protection facility is provided for use in an optical communications node that communicates with another optical communications node via first and second bi-directional communications paths respectively serving as a service path and protection path, in which a filter filters signals respectively received over the service and protection paths and generates a main signal and a complementary signal for each of the paths. A control unit then generates a Loss of Signal (LOS_A) indication for the service path if a SUM signal or DIFF signal respectively derived as a function of a sum of the main and complementary signals generated for the service path and difference between the main and complementary signals generated for the service path is less than a respective threshold value. A switch then invokes protection switching responsive to the presence of the LOS_A indication.

公开(公告)号：CA2252209C

公开(公告)日：2002-09-03

申请号：CA2252209

申请日：1998-10-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： FANG WEI-CHIAO WILLIAM ,  DENKIN NATHAN MYRON ,  FISHMAN DANIEL A

IPC: G02F1/01 ,  H04B10/00 ,  H04B10/02 ,  H04L1/22 ,  H04M3/22 ,  H04Q3/52 ,  H04B10/08 ,  H04B10/24

Abstract: A protection facility is provided for use in an optical communications node that communicates with another optical communications node via first and second bi-directional communications paths respectively serving as a service path and protection path, in which a filter filters signals respecti velyreceived over the service and protection paths and g enerates a main signal and a complementary signal for each of the paths. A control unit then generates a Loss of Signal (LOS_A) indication for the service path if a SUM signal or DIFF signal respectively derived as a function of a sum of the mai n and complementary signals generated for the service path and difference between the main and complementary signals generated for the service path is less than a respective threshold value. A switch then invokes protection switching responsive to the presence of the LOS_A indication.

公开(公告)号：CA2252209A1

公开(公告)日：1999-06-19

申请号：CA2252209

申请日：1998-10-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： FISHMAN DANIEL A ,  FANG WEI-CHIAO WILLIAM ,  DENKIN NATHAN MYRON

IPC: G02F1/01 ,  H04B10/00 ,  H04B10/02 ,  H04L1/22 ,  H04M3/22 ,  H04Q3/52 ,  H04B10/08 ,  H04B10/24

Abstract: A protection facility is provided for use in an optical communications node that communicates with another optical communications node via first and second bi-directional communications paths respectively serving as a service path and protection path, in which a filter filters signals respectively received over the service and protection paths and generates a main signal and a complementary signal for each of the paths. A control unit then generates a Loss of Signal (LOS_A) indication for the service path if a SUM signal or DIFF signal respectively derived as a function of a sum of the main and complementary signals generated for the service path and difference between the main and complementary signals generated for the service path is less than a respective threshold value. A switch then invokes protection switching responsive to the presence of the LOS_A indication.