Method for generating an alarm inhibit signal

• US 5,212,475 A
• Filed: 05/01/1989
• Issued: 05/18/1993
• Est. Priority Date: 05/18/1988
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Thoma, Wolfang
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Magistre, Dervis
• Application Number:
  US07/346,085
• Time in Patent Office: 1,478 Days
• Field of Search: 340/825.16, 340/825.52, 370/16, 370/16.1, 370/13, 370/54, 371/5.1, 371/11.1, 371/11.2
• US Class Current: 340/2.4
• CPC Class Codes: H04J 3/14 Monitoring arrangements for SDH/SONET rings H04J3/085

Abstract

A method for generating an alarm inhibit signal. A modified AIS-Signal in the form of long strings of ones signal with the addition of an identification character is provided. This identification character can be individual zeros that are periodically introduced with a frequency of less than 10^-3 or can be an auxiliary signal. When a digital signal distributor receives a standardized AIS-Signal or when it recognizes some other deficiency, it supplies a modified AIS-Signal to an outgoing path. Only the following digital signal distributors recognize the modification, in turn supply such a modified AIS-Signal and forego a message to a regional center. On the basis of the message of the digital signal distributor, a network management center switches to a backup path. The present invention is used in centrally controlled network protection switching systems.

Claims

1. A method for generating a digital alarm inhibit signal for a plurality of digital signal distributors connected in series in a signal path, each digital signal distributor having an incoming path and an outgoing path forming a part of the signal path, the method using a signal having long strings of ones pulse sequence that is both supplied to an outgoing path by digital signal distributors and is also recognized on an incoming path by the digital signal distributors and that can subsequently be further-processed, comprising allocating an identification character to the signal having long strings of ones pulse sequence.

2. The method according to claim 1, wherein, as the identification character, a signal having long strings of ones pulse sequence is periodically interrupted by individual zeros whose frequency is less than 10^-3.

3. The method according to claim 1, wherein an auxiliary signal is transmitted as the identification character.

4. The method according to claim 1, wherein a signal having long strings of ones pulse sequence is supplied only to an outgoing path.

5. The method according to claim 1, wherein a digital having long strings of ones pulse sequence is continuously inserted into a time slot of a pulse frame to be supplied into the outgoing path.

6. The method according to claim 2, wherein every second zero is replaced by a message.

7. The method according to claim 6, wherein the message is the address of the digital signal distributor supplying a signal having long strings of ones pulse sequence to the output path.

8. The method according to claim 3, wherein a signal having long strings of ones pulse sequence is inserted into a time slot of a pulse frame to be supplied into the outgoing path;

and wherein the auxiliary signal is inserted into another time slot of this pulse frame.

9. The method according to claim 1, wherein a reception of a signal having long strings of ones pulse sequence without identification character by the digital signal distributors is reported to a regional center.

10. The method according to claim 7, wherein a reception of a signal having long strings of ones pulse sequence having the identification character and accompanying address by the digital signal distributor is reported to a regional center.

11. The method according to claim 1, wherein a reception of a signal having long strings of ones pulse sequence without identification character by the digital signal distributors is reported to a network management center.

12. The method according to claim 7, wherein a reception of a signal having long strings of ones pulse sequence having the identification character and accompanying address by the digital signal distributor is reported to a network management center.

13. A method for generating a digital alarm inhibit indication signal for a plurality of digital signal distributors connected in series in a signal path, each digital signal distributor having an incoming path ad an outgoing path forming a path of the signal path, the method using a signal having long strings of ones pulse sequence that is both supplied to an outgoing path by digital signal distributors and is also recognized on an incoming path by the digital signal distributors and that can subsequently be further-processed, comprising allocating an identification character to the signal having long strings of ones pulse sequence, as the identification character, the signal having long strings of ones pulse sequence being periodically interrupted by individual zeros whose frequency is less than 10^-3.

14. The method according to claim 13, wherein every second zero is replaced by a message.

15. The method according to claim 14, wherein the message is the address of the digital signal distributor supplying a signal having long strings of ones pulse sequence to the outgoing path.

16. A method for generating a digital alarm inhibit indication signal for a plurality of digital signal distributors connected in series in a signal path, each digital signal distributor having an incoming path and an outgoing path forming a part of the signal path, the method a signal having long strings of ones pulse sequence that is both supplied to an outgoing path by digital signal distributors and is also recognized on an incoming path by the digital signal distributors and that can subsequently be further-processed, comprising allocating an identification character to the signal having long strings of ones pulse sequence, an auxiliary signal being transmitted as the identification character.

17. The method according to claim 16, wherein a signal having long strings of ones pulse sequence is inserted into a time slot of a pulse frame to be supplied into the outgoing path;

and wherein the auxiliary signal is inserted into another time slot of this pulse frame.