Auto-negotiation Monitor for LAN Switch Failure Detection
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Solution Overview
Problem
In networks with Ethernet switches connected over long distances, existing monitoring systems fail to detect failures in optical fibers on the reception side of LAN switches, leading to delayed failure detection and resolution, especially when the monitoring systems for LAN switches and repeating-transmission apparatuses are managed by different administrators.
Innovation Solution
An auto-negotiation monitor system that includes a repeating-transmission apparatus with a code discrimination block to detect auto-negotiation codes in LAN signals and an alarm unit to determine which switch transmitted the code earlier, notifying a monitor apparatus of the determination, allowing for timely failure detection and identification of the failure point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the monitor apparatus monitors only the repeating-transmission apparatus and not the LAN switches, then the monitoring system is simpler and easier to manage, but the failure detection capability is insufficient and cannot detect failures in reception-side optical fibers of LAN switches
Solution Approach 1:
The repeating-transmission apparatus acts as an intermediary that monitors auto-negotiation codes from both its own side and the opposing LAN switch side. By having the repeating-transmission apparatus perform the monitoring function that would otherwise require direct monitor apparatus access to LAN switches, the system achieves comprehensive failure detection without increasing monitoring system complexity or requiring unified administration.
2Reliability
If the monitor apparatus monitors both the repeating-transmission apparatus and the LAN switches, then the failure detection capability is comprehensive, but the monitoring system becomes more complex and requires unified administration
Solution Approach 1:
The monitoring functions are merged into the repeating-transmission apparatus itself. The repeating-transmission apparatus combines its own monitoring capabilities with the ability to monitor auto-negotiation codes from opposing LAN switches, eliminating the need for separate direct monitoring of LAN switches and simplifying the overall monitoring system architecture while maintaining comprehensive failure detection.
3Loss of time
If the repeating-transmission apparatus monitors auto-negotiation codes from opposing switches, then the failure detection time is reduced, but the device complexity of the repeating-transmission apparatus increases
Solution Approach 1:
The repeating-transmission apparatus is designed with multi-functionality, serving both as a signal repeater and as a monitoring device. By integrating the auto-negotiation code monitoring function into the existing repeating-transmission apparatus, the system achieves rapid failure detection without requiring separate dedicated monitoring equipment, thus minimizing additional device complexity while significantly reducing failure detection time.
Data Source
AI summary
Where each of switches opposed to each other detects optical-signal shutoff or optical-signal deterioration on the reception side of its port, the switch brings a link of the port down and outputs an auto-negotiation configuration code, as an LAN signal. Upon receiving the LAN signal transmitted from the switch, a repeating-transmission apparatus transmits the transmitted signal to an auto-negotiation monitor. The auto-negotiation monitor performs code analysis for the transmitted LAN signal. Where the auto-negotiation monitor detects that the transmitted LAN signal is the auto-negotiation configuration code, it notifies a monitor apparatus that “The switch detects a failure and the link is down.”, as an alarm.