Optical line protection device and optical line protection method

• US 20010003484A1
• Filed: 12/07/2000
• Published: 06/14/2001
• Est. Priority Date: 12/09/1999
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Fujita, Yoshitaka
• Granted Patent: US 6,823,137 B2
• Time in Patent Office: Days
• US Class Current: 398/1
• CPC Class Codes: H04J 3/085 for ring networks, e.g. SDH/SONET rings, self-healing rings, meashed SDH/SONET networks

Abstract

To provide a system in which a configuration is simple and a switching of an optical line can be performed at a high speed. A protection unit for performing optical line protection by using K1-K2 information inserted into a payload is provided for each physical interface. The protection unit includes a filter for separating a payload of user data and a payload including K1-K2 information according to a control signal in a received payload, a selector for switching user data to be transmitted or K1-K2 information to be transmitted after adding a control signal of a value corresponding thereto, and a control unit for controlling an output buffer to a switch block and creating K1-K2 information to be transmitted and communicating with a physical interface card of another system on the basis of K1-K2 information.

Claims

1. An optical line protection device, comprising protection units for performing optical line protection by using K1-K2 information inserted into a payload of a packet, for each physical interface.

2. The optical line protection device according to

claim 1

, wherein said protection units comprises:

a filter for separating a payload of user data from a payload including K1-K2 information according to a control signal in a received payload;

a selector for switching user data to be transmitted or K1-K2 information to be transmitted after adding a control signal of a value corresponding thereto; and

control units for controlling an output buffer to a switch block and creating K1-K2 information to be transmitted and communicating with a physical interface card of another system on the basis of K1-K2 information in a payload including K1-K2 information outputted from said filter.

3. The optical line protection device according to

claim 1

, further comprising means for detecting a trouble of a physical port by performing a CRC check on the basis of a payload length and a CRC code thereon.

4. The optical line protection device according to

claim 2

, further comprising units for detecting a trouble of a physical port by performing a CRC check on the basis of a payload length and a CRC code thereon.

8. An optical line protection network made by connecting an optical line protection device according to

claim 1

.

5. An optical line protection device in SDH/SONET(synchronous digital hierarchy/synchronous optical network), comprising protection units for performing optical line protection by using K1-K2 information inserted into an overhead of an SDH/SONET frame, for each physical interface.

6. The optical line protection device in SDH/SONET according to

claim 5

, wherein said protection units comprises:

extracting units for extracting said K1-K2 information from a received overhead;

inserting units for inserting K1-K2 information to be transmitted into an overhead to be transmitted; and

control units for controlling an output buffer to a switch block and creating K1-K2 information to be transmitted and communicating with a physical interface card of another system on the basis of K1-K2 information outputted from the extracting units.

7. The optical line protection device in SDH/SONET according to

claim 5

, further comprising units for detecting a trouble of a physical port by performing a CRC check on the basis of a payload length and a CRC code thereon.

9. An optical line protection method, comprising:

a K1-K2 information inserting step of inserting K1-K2 information into a payload of a packet; and

a protection step of performing optical line protection by using K1-K2 information inserted into a payload of a K1-K2 information packet by said K1-K2 information inserting step.

10. The optical line protection method according to

claim 9

, wherein said protection step comprises:

a filter step of separating a payload of user data and a payload including K1-K2 information according to a control signal in a received payload;

a selector step of switching user data to be transmitted or K1-K2 information to be transmitted after adding a control signal of a value corresponding thereto;

a buffer control step of controlling an output buffer to a switch block on the basis of K1-K2 information in a payload including K1-K2 information outputted from said filter; and

a communication control step of creating K1-K2 information to be transmitted and communicating with a physical interface card of another system.

11. The optical line protection method according to

claim 10

, further comprising a detecting step of detecting a trouble of a physical port by performing a CRC check on the basis of a payload length and a CRC code thereon.

12. In optical line protection in SDH/SONET (synchronous digital hierarchy/synchronous optical network), an optical line protection method in SDH/SONET, comprising a protection step of performing optical line protection by using K1-K2 information inserted into an overhead of an SDH/SONET frame.

13. The optical line protection method in SDH/SONET according to

claim 12

, wherein said protection step comprises:

an extracting step of extracting said K1-K2 information from a received overhead;

an inserting step of inserting K1-K2 information to be transmitted into an overhead to be transmitted; and

a control step of controlling an output buffer to a switch block and creating K1-K2 information to be transmitted and communicating with a physical interface card of another system on the basis of K1-K2 information outputted from the extracting means.

14. The optical line protection method in SDH/SONET according to

claim 13

, further comprising a step of detecting a trouble of a physical port by performing a CRC check on the basis of a payload length and a CRC code thereon.