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The core switch is gigabit while the others are 100 Mbps

A gigabit core switch can operate with 100 Mbps devices, but the overall speed on those connections will be limited to 100 Mbps.

Network Behavior

When a gigabit switch is connected to devices or other switches that only support 100 Mbps, the ports will auto-negotiate to the maximum speed supported by the connected device, which in this case is 100 Mbps . This means that while the core switch is capable of 1 Gbps, any traffic passing through the slower devices will be limited to 100 Mbps, creating potential bottlenecks in the network .

Cable Considerations

Gigabit Ethernet requires all 8 wires in the Ethernet cable to be properly connected and intact, whereas 100 Mbps connections only use 4 wires . Using older or damaged cables, or cables rated below Cat5e, can prevent gigabit speeds even if the switch and device support it. For reliable gigabit performance, Cat5e or Cat6 cables are recommended .

Device and Configuration Factors

Several factors can cause a gigabit switch to operate at 100 Mbps:

  • Device limitations: Older computers, PoE cameras, or other endpoints may only support 100 Mbps .
  • Router or upstream device: If the switch is connected to a router with only 100 Mbps ports, traffic leaving the switch to the router will be limited to 100 Mbps .
  • Network adapter settings: Incorrect speed and duplex settings or outdated drivers can cause a mismatch, forcing the connection to 100 Mbps .
  • Faulty ports or low-quality switches: Aging or defective switch ports may fail to maintain gigabit speeds .

Recommendations

  1. Check cables: Ensure all cables are Cat5e or higher and fully functional.
  2. Verify device capabilities: Confirm that connected devices support gigabit speeds.
  3. Inspect NIC settings: Set network adapters to auto-negotiate or manually configure to 1000 Mbps full duplex if needed.
  4. Audit network chain: Ensure routers, switches, and intermediary devices support gigabit speeds to avoid bottlenecks.
  5. Replace aging hardware: If a switch or port is unreliable, consider upgrading to maintain consistent gigabit performance . By following these steps, the core switch can operate at full gigabit speeds internally, while slower devices will still function at their maximum supported speed without disrupting the network.
The core switch is gigabit while the others are 100 Mbps - E-Motional Optics & Connectivity

The core switch is gigabit while the others are 100 Mbps - E-Motional Optics & Connectivity [PDF]

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