Network Device Presence Detection via Low-Frequency Voltage
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Solution Overview
Problem
Existing communication network detection methods struggle to accurately determine the presence or absence of peripheral devices, especially when they are not powered on or only partially functional, leading to difficulties in troubleshooting and requiring specialized personnel for diagnostic information gathering.
Innovation Solution
A method and system that apply a low-frequency voltage through an impedance on the transmission line, using a filter to couple this voltage to a detector, allowing for the differentiation between the presence and absence of network devices by comparing the voltage levels, regardless of the device's power status or functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard detection schemes using link pulses and carrier sense are used, then detection can be performed when equipment is powered on and functional, but detection fails when equipment is unpowered, missing, or non-functional
Solution Approach 1:
The system applies a low-frequency voltage through an impedance to the transmission line before attempting standard communication-based detection. This preliminary action creates a detectable voltage condition that exists independently of the remote device's power or functional state, enabling detection to proceed even when the device is unpowered, missing, or non-functional.
Solution Approach 2:
The patent introduces an intermediary detection mechanism using a filter coupled to the transmission line that detects voltage levels caused by the low-frequency signal. This intermediary approach allows the system to detect the presence or absence of a remote device through voltage level changes without requiring the device to be powered on or functional, thus bridging the gap between reliable detection and broad detection coverage.
2Measurement precision
If hardware on both ends must be powered and functional for detection, then accurate detection is possible, but troubleshooting becomes difficult and requires specialized personnel
Solution Approach 1:
The system performs self-diagnosis by automatically detecting whether a remote device is present, absent, unpowered, or non-functional through voltage level measurements. This self-service capability eliminates the need for specialized personnel to travel to remote sites for basic presence detection, allowing local users to easily identify the nature of connection problems.
Solution Approach 2:
The patent replaces the mechanical/functional requirement (device must be powered and operational) with an electrical field-based detection method. By using a low-frequency voltage signal and measuring resulting voltage levels through a filter, the system detects device presence without mechanical or functional interaction, substituting complex functional testing with simple voltage measurement.
3Productivity
If functional network interfaces and powered hardware are required for detection, then standard detection works, but it cannot distinguish between bad cable, bad connection, unpowered device, or bad interface
Solution Approach 1:
The detection system segments the diagnostic capability by measuring voltage levels at different stages of the communication path. By analyzing the voltage level changes caused by the low-frequency signal passing through the transmission line and impedance, the system can identify specific failure points (cable, connection, device, or interface) rather than providing a single undifferentiated detection result.
Solution Approach 2:
The patent changes the detection parameter from communication-based signals (which require functional devices) to voltage level measurements. By monitoring how the voltage level changes when a low-frequency signal is applied through the transmission line impedance, the system gains detailed diagnostic information about the state of the connection and remote device without requiring functional communication.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables automatic and accurate detection of network devices, simplifying troubleshooting by distinguishing between connected and unconnected devices, and identifying device types, without requiring functional communication hardware or power, thus facilitating easier diagnostics and reducing the need for specialized assistance.
Implementation Method 1
coupling, via a filter, the low-frequency voltage on the transmission line to a presence detector. Communication signals can be attenuated using the filter.
Implementation Method 2
applying, through an impedance, a low-frequency voltage on the transmission line side of the coupling
Data Source
AI summary
A method and apparatus for detecting the presence and the type of network devices connected to a management device via transmission lines. The apparatus may include a pull-up resistor, a pull-down resistor, a filter, and a presence detector, the resistors superimposing a DC or low-frequency voltage on the transmission line. The impact, if any, of the DC voltage one communications equipment and circuitry can be reduced by a coupling that isolates the DC voltage. Similarly, the filter prevents transmitted data signals from interfering with the DC voltage level. The method and apparatus function regardless of whether the network device is functional or powered on, and different values of pull-up or pull-down resistors can be used to indicate the type of device that terminates the transmission line.