Dynamic Port Mode Switching for Ethernet and RS-232
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Solution Overview
Problem
Conventional routers inefficiently use space with a dedicated serial console port, which is rarely used, and incur additional manufacturing and support costs, while lacking a simple method to switch between Ethernet and RS-232 modes using a single RJ-45 jack.
Innovation Solution
An electronic device with a physical port capable of dynamically switching between differential mode (Ethernet) and single-ended mode (RS-232) operation, using a control circuit to sense the port and switch between modes, allowing the same port to function as either an Ethernet or RS-232 port based on user needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dedicated serial console port is included in the router, then administrative interface functionality is provided, but space utilization is inefficient and manufacturing costs increase
Solution Approach 1:
The patent makes a single RJ-45 physical port universal by enabling it to perform multiple functions: Ethernet networking and serial console access. The port can be dynamically configured to operate in either mode, eliminating the need for a separate dedicated serial console port and improving space utilization while maintaining administrative interface functionality
2Adaptability or versatility
If a dedicated serial console port is included in the router, then administrative interface functionality is provided, but manufacturing and support costs increase
Solution Approach 1:
The patent reduces manufacturing and support costs by making a single RJ-45 port universal, eliminating the need to manufacture, test, and support separate dedicated serial console port hardware. The same physical port and connector are used for both Ethernet and serial console functions, simplifying the bill of materials and reducing assembly complexity
3Area of stationary object
If a single RJ-45 port is used for both Ethernet and serial console, then space and costs are improved, but switching between modes becomes complex
Solution Approach 1:
The patent implements self-service through automatic detection and configuration. When a device is connected to the RJ-45 port, the system automatically detects whether it is an Ethernet device or a serial console device and configures the port accordingly without requiring manual intervention. This eliminates complex manual switching mechanisms while maintaining space efficiency
Solution Approach 2:
The patent uses parameter changes to differentiate between Ethernet and serial console modes. By detecting specific electrical parameters or signaling characteristics of connected devices, the system dynamically changes the operational parameters of the RJ-45 port to match the appropriate mode, enabling automatic adaptation without complex switching hardware
Data Source
AI summary
An electronic device has a physical port, and a control circuit coupled to the physical port. The control circuit is arranged to electrically sense the physical port, and operate the physical port as one of an Ethernet port and an RS-232 port based on electrically sensing the physical port. In some arrangements, the physical port operates as an Ethernet port at one time and an RS-232 port at another time. In some arrangements, the electronic device senses for Ethernet signals and RS-232 signals concurrently. In other arrangements, the electronic device senses for Ethernet signals and RS-232 signals at different times in an alternating manner.