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The network disconnects as soon as the switch is connected

Fiber and communications infrastructure knowledge brief Published 17 Jun 2021

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

The network disconnects when a switch is connected often due to a faulty switch, cabling issues, or network loops. Common Causes1. Faulty Switch Hardware: Switches can fail internally, causing all connected devices to lose connectivity.

Users have reported that simply unplugging and reconnecting the switch temporarily restores network access, indicating a potential hardware fault in the switch itself. 2. Network Loops: If multiple switches are connected without proper loop prevention (like Spanning Tree Protocol), a loop can flood the network with broadcast traffic, causing disconnections.

This is more common in unmanaged switches or when port configurations are incorrect. 3. Cabling Issues: Damaged or low-quality Ethernet cables can cause intermittent connectivity.

Using Cat5e or Cat6 cables and testing with known-good cables can help isolate the problem. 4.

IP or DHC

P Conflicts: If the switch or connected devices are causing duplicate IP addresses or DHCP conflicts, devices may lose network access. This can happen when a new device or switch is added to the network. 5.

Power or Firmware Problems: Some switches may have firmware bugs or power supply issues that trigger network drops when devices are connected.

Troubleshooting Steps

Test the Switch Independently: Connect the switch to a single device and the router to see if the connection remains stable. If it works, the issue may be with multiple devices or cabling. Check Cables: Replace Ethernet cables between the router, switch, and devices with known-good cables.

Power Cycle Devices: Turn off the switch, router, and connected devices, then power them on in sequence: router → switch → devices. Update Firmware: If the switch is managed, ensure it has the latest firmware installed. Check for Loops: Ensure no redundant connections exist between switches unless Spanning Tree Protocol is enabled.

Try a Different Switch: If possible, replace the switch with another unit to see if the problem persists, which can confirm a hardware fault. Monitor Network Traffic: For managed switches, check logs for unusual traffic spikes or errors that could indicate loops or misconfigured devices.

Additional Recommendations

Using a managed switch can help identify and prevent loops, monitor traffic, and isolate problematic ports. Ensure that all devices have updated network drivers and that power management settings do not disable network adapters. By systematically testing cables, devices, and switch hardware, you can pinpoint whether the issue is caused by a faulty switch, network loop, or configuration problem.

The network disconnects as soon as the switch is connected - ENSAA OPTICAL NETWORKS [PDF]

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This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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