Printer Gateway Switching for LAN Failure Backup Connectivity
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Solution Overview
Problem
Printers experience communication errors when a LAN failure occurs, preventing communication with external devices connected to a network outside the LAN, such as a server managing the printer.
Innovation Solution
The printer includes a communication unit that switches the default gateway from a LAN gateway to a mobile communication network gateway when a communication malfunction occurs, allowing it to communicate with external devices via the mobile network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the printer uses a LAN gateway for communication, then communication speed and stability within the local network is improved, but communication with external devices is interrupted when LAN failure occurs
Solution Approach 1:
The printer dynamically switches between LAN gateway and mobile communication gateway based on network status. The control unit monitors LAN connectivity and automatically changes the active communication path, transforming a static single-gateway system into a dynamic multi-gateway system that adapts to changing network conditions.
Solution Approach 2:
The system changes the operational parameter of the default gateway from fixed (always LAN) to variable (LAN or mobile depending on status). By modifying which gateway is active based on network conditions, the system maintains communication reliability while adapting to different network environments.
2Reliability
If the printer switches to mobile communication network gateway, then communication with external devices is maintained during LAN failure, but device complexity increases
Solution Approach 1:
The control unit automatically monitors LAN status and performs self-service gateway switching without user intervention. The system detects communication failures and autonomously switches to the mobile gateway, then automatically returns to LAN gateway when connectivity is restored, eliminating the need for manual configuration or complex user management.
Solution Approach 2:
The system implements feedback control by continuously monitoring LAN communication status and using this information to determine gateway switching decisions. The control unit receives feedback about network connectivity and adjusts the active gateway accordingly, creating a closed-loop control system that manages complexity through automated decision-making.
Data Source
AI summary
One aspect of the present invention is a printer comprising: a communication unit that communicates with a first device via a first gateway and communicates with a second device via a second gateway, the first gateway being connected to a local area network (LAN) and set as a default gateway, the second gateway being connected to a mobile communication network; and a control unit that, when communication malfunction occurs in communication with the first device during the communication with the first device via the first gateway, switches a gateway set as the default gateway from the first gateway to the second gateway and thereby controls the communication unit so as to communicate with the second device.