Electrical Interface Module With Multiplexed SFP+ Link Status Pin
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrical interface modules, particularly those using SFP+ packaging, lack an efficient mechanism for host devices to easily determine the operational status of RJ45 network port terminals, hindering the ability to monitor signal transmission status.
Innovation Solution
Redefine a specific pin (PIN8) of the SFP+ gold fingers as a network port status indication pin, utilizing an MCU to configure its function based on register values, and integrate it with a PHY chip to monitor and indicate the link status of the network port terminal through level signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrical interface module uses SFP+ packaging with gold fingers, then the module achieves compact form factor and electrical connection capability, but the host device cannot easily determine the operational status of RJ45 network port terminal
Solution Approach 1:
The patent introduces an intermediary signal transmission path through the gold finger pins. Specifically, PIN8 serves as a mediator that carries link status information from the network port terminal to the host device. The status indicator circuit generates level signals that reflect the link status, and these signals are transmitted through the intermediary PIN8 connection, enabling the host device to determine operational status without direct access to internal circuitry.
Solution Approach 2:
The patent makes the gold finger pins multi-functional. PIN8 serves dual purposes: it acts as a standard electrical connection pin for signal transmission, and simultaneously functions as a status indication channel. By configuring PIN8 to carry both data signals and status indicator signals, the system achieves universal functionality where the same physical interface provides both connectivity and diagnostic capabilities.
2Measurement precision
If the multiplexed pin is configured for network port status indication, then the host device can monitor link status, but the pin cannot simultaneously indicate RX_LOS state without additional configuration
Solution Approach 1:
The patent implements dynamic pin configuration through the status indicator circuit that can adapt its output based on operational mode. The circuit dynamically adjusts which status information is presented on the multiplexed pin depending on configuration settings. When configured for network port status indication, it outputs link status levels; when configured for optical monitoring, it outputs RX_LOS levels. This dynamic adaptability allows the same pin to serve different monitoring functions with high precision.
Solution Approach 2:
The patent changes the operational parameters of the multiplexed pin through register configuration. By modifying the function configuration register values, the system changes the electrical characteristics and signal output of the pin. The parameter change includes switching between different status indication modes (network port status vs. RX_LOS status), which alters the pin's functional behavior while maintaining its physical integrity and connection capabilities.
3Adaptability or versatility
If the MCU configures the multiplexed pin function based on register values, then the pin can be dynamically assigned for different status indications, but the system requires additional configuration complexity
Solution Approach 1:
The patent implements self-service configuration where the system automatically manages the pin function assignment based on operational requirements. The status indicator circuit autonomously determines the appropriate status information to output based on the operational state of the network port terminal and optical receiver. This self-service mechanism reduces the burden on external configuration while maintaining high adaptability, as the circuit automatically selects the appropriate status indication mode without requiring complex manual register management.
Data Source
AI summary
An electrical interface module comprises a circuit board, a network port terminal, a PHY chip and an MCU arranged on the circuit board. One end of the circuit board is disposed with a gold finger comprising an I2C pin and a multiplexing pin. The PHY chip comprises a status register. One end of the MCU can receive a command from a host device through the I2C pin, the other end thereof is connected to the PHY chip to obtain the status register value and thus send a corresponding level signal to the multiplexed pin. The function configuration register in the MCU is configured to store register value corresponding to the command from the host device, and performs corresponding function configuration on the multiplexed pin based on the register value to obtain link status of the network port terminal based on the level signal of the multiplexed pin.