MFAS-Aligned PRBS Patterns for OTN Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OTN testing methods using unaligned PRBS patterns can lead to false positives and fail to detect delays or slips in data transmission, especially when encryption keys are used, due to the lack of synchronization with Multi-Frame Alignment Signal (MFAS) in Optical Transport Network (OTN) frames.
Innovation Solution
The use of MFAS-aligned PRBS patterns, where the PRBS pattern is reset to a seed value when MFAS=0, ensures that the test signal is properly synchronized and aligned, allowing for accurate detection of delays and slips by comparing the received signal with the transmitted signal based on the MFAS-aligned pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If unaligned PRBS patterns are used for OTN testing, then testing can be performed without synchronization, but false positives occur and delays or slips cannot be detected
Solution Approach 1:
The PRBS pattern is pre-aligned with the MFAS structure before transmission. The test signal generator synchronizes the PRBS pattern to the MFAS alignment signal, ensuring that the pattern starts at the correct frame position. This preliminary alignment action prevents false positives and enables accurate detection of delays or slips in the OTN transmission path.
2Reliability
If PRBS pattern is reset to seed value when MFAS=0, then synchronization with MFAS is maintained, but testing complexity increases
Solution Approach 1:
The system continuously monitors the MFAS alignment signal and uses it as feedback to control the PRBS pattern generation. When MFAS=0 is detected, the PRBS pattern is reset to its seed value, ensuring continuous synchronization. This feedback mechanism maintains reliable synchronization without requiring complex external control systems, as the MFAS signal itself provides the necessary control information.
3Measurement precision
If MFAS-aligned PRBS patterns are used, then false positives are eliminated and delays are detected, but the testing method becomes more complex
Solution Approach 1:
The MFAS alignment signal serves multiple functions: it provides frame synchronization, enables PRBS pattern alignment, and facilitates delay detection. By utilizing this existing OTN synchronization signal for multiple testing purposes, the system achieves high measurement precision without requiring separate dedicated signals or complex testing infrastructure. The same MFAS signal that synchronizes data transmission also synchronizes the test pattern.
Data Source
AI summary
A test device for Optical Transport Network (OTN) testing using MFAS-aligned pseudorandom binary sequence (PRBS) patterns is disclosed. The test device may comprise a signal generator to generate a test signal that comprises an MFAS-aligned PRBS pattern. The test device may also comprise a transmitter to transmit the test signal into an OTN and a receiver to receive the test signal from the OTN. The test device may comprise a processor to determine whether the received test signal matches the transmitted test signal based on the MFAS-aligned PRBS pattern. The test device employing a technique that uses an MFAS-aligned PRBS pattern may help ensure quality of service in OTN, especially for transmission of secured data.