Claims
- 1. A method of transmitting data in a synchronous hierarchic network system comprising at least a signal transmission path segment between a first network element and a second network element, said method comprising:establishing a tandem connection monitoring method for monitoring transmission of information over said path segment, and means for suppression of the insertion of all ones caused by out of multiframe state subsequent to an alteration of the signal transmission path for a predefined interval, detecting an out of multiframe state in response to an interruption, distortion or switching operation on said path segment, starting a timer upon detection of an out of multiframe state, and upon the timer timing a predetermined time interval inserting all ones.
- 2. The method of transmitting data according to claim 1, wherein the detection of the Loss of Tandem Connection defect (dLTC) with its accompanied subsequent all ones insertion is decoupled from the detection of an out of multiframe signal transmission state.
- 3. The method of transmitting data according to claim 1, wherein a Loss of Tandem Connection defect (LTC) signal is only set if an out of multiframe (OOM) state is active for a time period which is longer than said predefined time interval.
- 4. The method of transmitting data according to claim 1, wherein the length of the predefined time interval is configurable from 0 to 3 tandem connection multiframes.
- 5. The method of transmitting data according to claim 3, wherein a trail trace identifier (TTI) mismatch detection process is suspended during the Out of Multiframe (OOM) state.
- 6. A synchronous hierarchic network system, especially adapted to data transmission, comprisingat least a path segment between a first network element and a second network element on which a tandem connection monitoring method is established for monitoring information over said path segment, means for detecting an out of multiframe state in response to an interruption, distortion or switching operation on said path segment, a timer which starts timing upon detection of an out of multiframe state, and means for inserting all ones upon the timer timing a predetermined time interval.
- 7. The synchronous hierarchic network system according to claim 6 comprising means for suspension of the trace identifier mismatch detection process during an OOM state.
- 8. The synchronous hierarchic network system according to claim 6, wherein the detection of the Loss of Tandem Connection defect (LTC) defect with its accompanied subsequent all ones insertion is decoupled from the detection of an out of multiframe signal transmission state.
- 9. The synchronous hierarchic network system according to claim 6, wherein a Loss of Tandem Connection defect (dLTC) signal is only set if an out of multiframe (OOM) state is active for a time period which is longer than a predefined time interval.
- 10. The synchronous hierarchic network system according to claim 6, wherein the length of the predefined time interval is configurable from 0 to 3 tandem connection multiframes.
Priority Claims (1)
Number |
Date |
Country |
Kind |
99307111 |
Sep 1999 |
EP |
|
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of European Patent Application No. 99307111.7, which was filed on Sep. 7, 1999.
US Referenced Citations (8)
Non-Patent Literature Citations (2)
Entry |
US 5,699,349, 12/1997, Russ et al. (withdrawn) |
European Search Report, dated Mar. 6, 2000. |