Optical Transmission Apparatus MSI Mismatch Detection
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Solution Overview
Problem
Current optical transmission systems, particularly OTNs, face challenges in detecting MSI mismatches between transmission and reception sides, leading to undetected errors and unsuitable alarms, especially when handling concatenated signals.
Innovation Solution
An optical transmission apparatus with an extractor to gather port allocation information, a comparator to count and compare allocated slots with expected values, and a memory to store expected counts, enabling detection of mismatches between transmission and reception sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the MSI value is compared only by tributary slot according to ITU-T standard, then the detection process is simple, but MSI mismatches in concatenated signals cannot be detected
Solution Approach 1:
The patent segments the MSI comparison process into two levels: first comparing by tributary slot (simple level), then further comparing by concatenated slot count (detailed level). This segmentation allows the system to maintain simple initial filtering while adding comprehensive detection capability for concatenated signals without proportionally increasing overall complexity.
Solution Approach 2:
The patent performs preliminary extraction and storage of concatenation count information from the received MSI before the comparison process. By preparing this data in advance, the system can efficiently perform both tributary slot comparison and concatenated signal detection without adding significant processing complexity during the actual mismatch detection phase.
2Reliability
If concatenated slot count information is extracted and stored for each slot, then MSI mismatch detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the specific concatenation count information from the MSI that is necessary for mismatch detection, rather than processing the entire MSI structure. This selective extraction reduces the complexity of information processing while maintaining the ability to detect MSI mismatches in concatenated signals accurately.
Solution Approach 2:
The patent creates a simplified copy of the concatenation count information from the received MSI and stores it in a dedicated storage unit. This copying approach allows the system to reference pre-processed data during comparison, reducing the need for complex real-time processing while improving detection accuracy.
3Reliability
If the reception-side apparatus stores expected MSI values for comparison, then mismatch detection capability is improved, but memory requirements and system complexity increase
Solution Approach 1:
The patent implements a dedicated storage unit specifically for holding expected MSI values and their corresponding concatenation counts, rather than using general-purpose memory structures. This specialized local storage simplifies the retrieval and comparison process by providing direct access to the specific data needed for mismatch detection, reducing overall system complexity.
Data Source
AI summary
An optical transmission apparatus includes an extractor that extracts information indicating port allocation to each slot of a reception signal; a comparator that based on the extracted information and for a given slot among the slots, obtains a count of the slots allocated the same port as the given slot and compares the obtained count of slots and an expected value for the given slot; and a memory that stores therein for each slot, an expected value for the count of slots allocated the same port as the slot. The comparator detects a mismatch concerning the given slot, when the obtained count of slots and the expected value for the given slot differ.