Optical transmission apparatus having path trace function

• US 20050163055A1
• Filed: 03/18/2005
• Published: 07/28/2005
• Est. Priority Date: 01/20/2003
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Hagimura, Dai
• Granted Patent: US 7,522,533 B2
• Time in Patent Office: Days
• US Class Current: 370/248
• CPC Class Codes: H04B 10/00 Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
• CPC Class Codes: H04J 2203/0042 Ring
• CPC Class Codes: H04J 3/14 Monitoring arrangements for SDH/SONET rings H04J3/085

Abstract

An optical transmission apparatus has a path trace function of carrying out a conductive state check of a path in a synchronous optical transmission network. The optical transmission apparatus includes a first judgment unit judging a path trace format of an existing standard in accordance with detection of a first specific code contained in path trace data, and a second judgment unit judging a path trace format of a new standard in accordance with detection of a second specific code contained in path trace data. The apparatus further includes a third judgment unit specifying one of the path trace formats of the new standard in accordance with a content of a third specific code contained together with the second specific code in the path trace data.

Claims

1. An optical transmission apparatus having a path trace function of carrying out a conductive state check of a path in a synchronous optical transmission network, comprising:

a first judgment unit judging a path trace format of an existing standard, in response to a detection of a first specific code contained in a path trace data; and

a second judgment unit judging a path trace format of a new standard, in response to a detection of a second specific code contained in the path trace data.

2. The optical transmission apparatus according to claim 1, further comprising:

a third judgment unit specifying one of the path trace formats of a plurality of the new standards, in accordance with a content of a third specific code which is contained together with the second specific code in the path trace data.

3. The optical transmission apparatus according to claim 1, wherein when the first judgment unit does not detect the first specific code, the second judgment unit detects the second specific code.

4. The optical transmission apparatus according to claim 2, wherein when the first judgment unit does not detect the first specific code, the second judgment unit detects the second specific code;

and

when the second judgment unit detects the second specific code, the third judgment unit detects the third specific code.

5. The optical transmission apparatus according to claim 1, wherein the first specific code is a carriage return code;

and

the second specific code is a frame start marker.

6. The optical transmission apparatus according to claim 2, wherein the first specific code is a carriage return code;

the second specific code is a frame start marker; and

the third specific code comprises an operation result of a circulation redundancy inspection of the path trace data corresponding to 16 bytes or 64 bytes of a previous frame.

7. The optical transmission apparatus according to claim 5, wherein the path trace data in the path trace format of the existing standard has a 64-byte configuration of a path trace message represented by a printable or displayable ASCII character code corresponding to 62 bytes, the carriage return code corresponding to one byte, and a line feed code corresponding to one byte;

and

the path trace data in the path trace format of the new standard has a 16-byte configuration of a header byte corresponding to one byte including the second specific code and a path trace message represented by a printable or displayable ASCII character code corresponding to 15 bytes, or a 64-byte configuration of a header byte corresponding to one byte including the second specific code and a path trace message represented by a printable or displayable ASCII character code corresponding to 63 bytes.

8. The optical transmission apparatus according to claim 6, wherein the path trace data in the path trace format of the existing standard has a 64-byte configuration of a path trace message represented by a printable or displayable ASCII character code corresponding to 62 bytes, the carriage return code corresponding to one byte, and a line feed code corresponding to one byte, and

the path trace data in the path trace format of the new standard has a 16-byte configuration of a header byte corresponding to one byte including the second specific code and the third specific code and a path trace message represented by a printable or displayable ASCII character code corresponding to 15 bytes, or a 64-byte configuration of a header byte corresponding to one byte including the second specific code and the third specific code and a path trace message represented by a printable or displayable ASCII character code corresponding to 63 bytes.

9. The optical transmission apparatus according to claim 1, further comprising:

a holding unit that can hold the path trace data of the path trace format of the existing standard and the path trace format of the new standard.

10. The optical transmission apparatus according to claim 9, wherein the second judgment unit and the holding unit are shared to process the path trace data of the path trace format of the existing standard and the path trace format of the new standard.

11. The optical transmission apparatus according to claim 2, wherein the third judgment unit is shared to process the path trace data of the path trace format of the existing standard and the path trace format of the new standard.

12. The optical transmission apparatus according to claim 1, further comprising:

a protection stage number function unit judging a normal reception of the path trace format on the basis of detection results of a plurality of times.

13. The optical transmission apparatus according to claim 12, further comprising:

a comparing unit comparing a path trace message received from the protection stage number function unit and a path trace message that is preset from a maintainer terminal and held as an expectation value.

14. The optical transmission apparatus according to claim 1, further comprising:

a unit, when a detection impossible state of the path trace format occurs, notifying a maintainer terminal of the occurrence of the detection impossible state.

15. The optical transmission apparatus according to claim 1, further comprising:

a unit, in accordance with a result of automatic determination of the path trace format from an opposite station at a time of a two-way transmission route configuration or intermediate path trace execution as the path, automatically selecting the path trace format that can be received and transmitting the path trace data to the opposite station at the time of the two-way transmission route configuration or to a path trace reception station existing at an intermediate position at the time of the intermediate path trace execution.

16. The optical transmission apparatus according to claim 15, further comprising:

a unit, when a character number of a path trace message of a transmission target set from a maintainer terminal exceeds a character number processed in the path trace format, notifying the maintainer terminal of a character number excess state and a transmittable maximum character number.

17. The optical transmission apparatus according to claim 1, further comprising:

a unit reporting a judgment result of the path trace format, and a SONET/SDH mode based on an SS bit within an H1 byte of a SONET/SDH frame, to a maintainer terminal.