To link a copper network to a fiber network, you must add fiber-capable modules to your devices:

Method A — Use a switch or router that has both copper and fiber ports (recommended)

Select the cable (the orange dashed line) from the Connections menu.

| Mistake | Symptom | Solution | | :--- | :--- | :--- | | | The link light on the media converter stays orange/red. | Delete the cable. Use Copper Straight-Thread for RJ45 and Fiber for the SFP side. | | Mismatched SFP types | Fiber link down. | On the switch’s physical tab, ensure the inserted SFP matches the media converter's fiber spec (e.g., LX vs SX). | | Forgetting no shutdown | Line protocol is down. | Manually type no shutdown on both switch interfaces connected to the converter. | | VLAN mismatch | Ping fails despite link lights green. | Ensure both switch interfaces (Fa0/1 on 2960 and Gi0/1 on 3560) are in the same VLAN or both in trunk mode. | | Distance limit ignored | Signal degradation (rare in PT but modeled). | Keep fiber links under 500m in the simulation for SX, and under 10km for LX. |

Configure the switches as follows: