PON Rogue Detection via SD Sampling Timeslots
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Solution Overview
Problem
Current methods for detecting rogue behavior in Passive Optical Networks (PON) are plagued by low reliability, long detection times, and the occupation of upstream bandwidth resources, leading to service interruptions and user complaints.
Innovation Solution
The method involves constructing and transmitting short and long timeslots via an optical transceiver to perform Signal Detect (SD) sampling on upstream optical signals, allowing for quick and accurate detection of rogue behavior without occupying fixed bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If optical power measurement method is used to detect rogue behavior, then detection implementation is simple and convenient, but detection reliability is low due to measurement errors and threshold settings
Solution Approach 1:
The patent replaces optical power measurement (analog measurement) with SD signal sampling (digital measurement). The optical transceiver samples the upstream optical signal in the detection bandwidth and converts it to a digital SD signal, which is then processed by the OLT. This substitution eliminates measurement errors and threshold setting issues associated with optical power measurement, significantly improving detection reliability while maintaining implementation simplicity.
2Reliability
If multiple optical power measurements are conducted to ensure accuracy, then detection reliability improves, but detection time increases significantly
Solution Approach 1:
The patent replaces repeated optical power measurements with a single SD signal sampling operation. The optical transceiver performs SD signal sampling on the upstream optical signal, and the OLT processes the digital sampling results directly. This eliminates the need for multiple measurements and threshold comparisons, reducing detection time while maintaining high reliability through digital signal processing.
3Reliability
If an extra T-CONT is configured for optical power measurement, then rogue behavior detection can be performed, but upstream bandwidth resources are occupied
Solution Approach 1:
The patent utilizes the existing detection bandwidth that is already allocated to the optical transceiver for its normal operation. The optical transceiver performs SD signal sampling on the upstream optical signal within this existing bandwidth without requiring any additional dedicated bandwidth. This self-service approach allows rogue behavior detection to be performed using resources already available in the system, avoiding the need to allocate extra T-CONT and preserve upstream bandwidth for user services.
Data Source
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AI summary
The disclosure provides a method and device for detecting rogue behaviour. The method comprises: for the upstream optical signal of each Passive Optical Network (PON) port, an Optical Line Terminal (OLT) constructs a short timeslot and transmits it via an optical transceiver; the OLT controls the optical transceiver to conduct a first Signal Detect (SD) sampling detection on the upstream optical signal according to the short timeslot to obtain a first detection result; the OLT judges, according to the first detection result, whether the upstream optical signal is valid; if so, the OLT constructs a long timeslot and transmits it via the optical transceiver, and controls the optical transceiver to conduct a second SD sampling detection on the upstream optical signal according to the long timeslot to obtain a second detection result; and the OLT determines, according to the second detection result, whether the current PON port is experiencing rogue behaviour. The disclosure achieves quick and accurate detection without occupying fixed bandwidth, thus maximizing the utilization of the upstream bandwidth.