SFP Power Supply Voltage Control for Module Type Detection

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Solution Overview

Problem

In hybrid fiber coaxial (HFC) networks, the similarity in packaging and pin layout between digital and analog Small Form Pluggable (SFP) optical transceiver modules can lead to accidental insertion of digital SFP modules into analog slots, resulting in damage due to mismatched power supply voltages, such as +5V being applied to modules configured for +3.3V.

Innovation Solution

A power supply control system that detects the type of SFP module inserted into a slot and adjusts the power supply voltage accordingly, setting a default lower voltage (+3.3V) for digital modules to prevent damage, while applying +5V for analog modules, using a processor to communicate with the module and manage power supply voltages dynamically.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the same pin layout is used for both digital and analog SFP modules, then ease of manufacture and device compatibility are improved, but the risk of accidental insertion and damage increases

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoiddamage risk

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary detection of the SFP module type before applying power supply voltage. The processor detects whether an analog or digital SFP module is inserted into the slot, and based on this detection, dynamically configures the power supply voltage to match the module requirements, preventing damage before it occurs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The power supply voltage parameter is dynamically changed based on the detected module type. The system switches between +5V for analog SFP modules and +3.3V for digital SFP modules, allowing the same physical slot and pin layout to safely support both module types with different voltage requirements

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If a fixed power supply voltage is provided to the slot, then device complexity is reduced, but adaptability to different module types deteriorates

Engineering Contradiction:

Improvepower supply control complexityVSAvoidmodule type compatibility

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The power supply voltage is made dynamic rather than fixed. The system automatically adjusts the power supply voltage based on the detected module type, transitioning from a static +5V supply to a dynamic supply that can be +5V for analog modules or +3.3V for digital modules, enhancing adaptability without significant complexity increase

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements feedback by detecting the module type inserted in the slot and using this information to control the power supply voltage. The processor continuously monitors the slot status and adjusts the voltage accordingly, creating a closed-loop control system that adapts to different module types

Inventive Principle:

Principle #23Feedback

3Reliability

If higher power supply voltage (+5V) is always applied, then analog modules can operate correctly, but digital modules will be damaged

Engineering Contradiction:

Improveanalog module operationVSAvoiddigital module damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system takes preliminary anti-action by detecting the module type before applying the higher +5V voltage. For digital SFP modules, the system prevents the application of +5V by detecting the module type first and configuring the power supply to output only +3.3V, thereby preventing damage before it can occur

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The processor acts as an intermediary between the power supply and the SFP module. It mediates the power delivery by detecting module type and intelligently selecting the appropriate voltage level, preventing direct harmful interaction between the fixed +5V supply and incompatible digital modules

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10860077B2Power supply control for pluggable modules in a networking node

Publication Date: 2020.12.08 ARRIS ENTERPRISES LLC

AI summary

In one embodiment, a computing device detects a module that is inserted into a first slot. The computing device includes a first slot to operate with a first type of module and a second slot to operate with a second type of module. The first slot and the second slot include a same pin position for receiving a power supply pin from the first type of module and the second type of module. The module is communicated with to determine whether the module is the first type of module or the second type of module. The first type of module receives a first type of signal that is combined with a second type of signal from the second type of module. The computing device adjusts a power supply voltage to the power supply pin of the first slot from a first value to a second value when the first type of module is detected.