Execute the command “combo enable fiber” in interface mode to switch to the optical interface; on the contrary, “undo combo enable fiber” switches to the default electrical interface state. Enter system view, return user view with return command. If an interface is not connected to a cable or a fiber, disable the interface using the shutdown command to prevent exceptions caused by. Page 5 S5700-52X-LI-AC • 48 10/100/1000Base-T Ethernet ports, 4 10GE SFP+ ports (10GE/GE auto-sensing) • Two models: AC model and DC model, supporting S5700-52X-LI-DC RPS ( redundant power supply) • Forwarding performance:132 Mpps • 48 10/100/1000Base-T Ethernet ports, 4 10GE SFP+ ports. Problem: All optical ports cannot be connected, and the indicator lights are not on. Solution: To solve this problem, you can follow these steps: Check if the fiber and optical modules are compatible. Perform a. The undo am isolate command cancels unidirectional isolation between the current interface and a specified interface. For example: Replace USERNAME with the new username, set the password, define service-type (telnet, ssh, etc.