Cable Modem OUDP Pattern Detection for RF Leakage Location
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Solution Overview
Problem
Conventional cable network leakage detection methods require disconnecting customers and using external transmitters, which is cumbersome and disruptive.
Innovation Solution
A testing instrument identifies orthogonal frequency division multiple access (OFDMA) upstream data profile (OUDP) patterns within OFDMA signals transmitted by cable modems to detect radio frequency (RF) leakage without disconnection, using a predetermined pattern for comparison.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional leakage detection techniques using external transmitters are used, then leakage detection capability is achieved, but customer service disruption and operational complexity increase
Solution Approach 1:
The cable modem itself generates the test signal through its normal OFDMA upstream data transmissions. The modem serves its own dual purpose: both as a data communication device and as a signal source for leakage detection. This eliminates the need for external transmitters and customer disconnection, as the modem's regular operations provide the test signal automatically.
Solution Approach 2:
The cable modem's OFDMA upstream transmissions, originally designed solely for data communication, are leveraged to simultaneously serve as test signals for leakage detection. This multi-functional use of the modem's existing signal generation capability eliminates the need for separate leakage detection equipment and customer disconnection.
2Reliability
If external transmitters are used for leakage detection, then signal leakage can be detected, but device complexity and testing time increase
Solution Approach 1:
The cable modem generates its own test signal through normal OFDMA upstream data transmissions, eliminating the need for external transmitters. The existing modem infrastructure serves dual purposes: data communication and signal generation for leakage detection, thereby reducing device complexity.
Solution Approach 2:
The invention extracts and utilizes the OUDP patterns from the cable modem's normal upstream data signals. By isolating and analyzing these specific pattern characteristics, the system can detect leakage without requiring additional external transmission equipment, thus simplifying the overall device complexity.
3Reliability
If conventional leakage detection methods are used, then leakage can be identified, but productivity and testing efficiency decrease
Solution Approach 1:
The cable modem continues its normal OFDMA upstream data transmissions without interruption during leakage detection. The detection process occurs continuously alongside regular data communication, eliminating the need to take the customer offline and thereby maintaining continuous productive operation while performing leakage detection.
Solution Approach 2:
The cable modem's ongoing data transmission operations automatically provide the test signal for leakage detection. This self-service approach eliminates the need for separate testing procedures and customer disconnection, allowing leakage detection to occur during normal operational hours without reducing productivity.
Data Source
AI summary
A method of detecting a radio frequency signal leakage in a wired cable network may be provided. The method may be performed by a testing instrument. The method may include scanning wireless radio frequency signals in a test area. The method may also include receiving a wireless radio frequency signal in response to the scanning and extracting a bit pattern from the received wireless radio frequency signal. The method may further include comparing the extracted bit pattern with one or more predetermined bit patterns associated with corresponding one or more cable modems in the wired cable network. The method may additionally include indicating that the received wireless radio frequency signal is a leakage signal from the wired cable network in response to determining that the extracted bit pattern matches at least one predetermined bit pattern of the one or more predetermined bit patterns.