Huawei 5720s connects to multiple optical modules

Huawei S5720S switches support multiple optical modules, but only one port per combo port can be active at a time, and GPON modules restrict the use of other optical ports.Optical Module CompatibilityHuawei S5720S switches use SFP and SFP+ optical modules for 1G and 10G connections. When deploying multiple optical modules:Combo Ports: Each combo port pairs an optical port with an electrical Ethernet port. Only one port in a combo pair can be active at a time. If the optical port is active, the electrical port is automatically shut down, and vice versa .GPON Modules: If a port uses a GPON optical module, other 1000BASE-X optical ports cannot be used simultaneously on the same switch .Module Type Restrictions: Ensure that the optical module matches the port speed. For example, do not use a 10G module on a 1G interface. Single-mode and multi-mode fibers must also match the module type .Configuration and TroubleshootingPort Status Check: Use the command display interface xgigabitethernet0/0/x to verify if a port is administratively down or active .Transceiver Diagnostics: Run display transceiver interface xgigabitethernet0/0/x verbose to check wavelength, received, and transmitted optical power.Auto Mode Behavior: By default, combo ports operate in auto mode. The first connected interface (optical or electrical) determines the active port. If the electrical port is already up, connecting an optical module will not switch the active port automatically .Deployment TipsStacking and Logical Ports: For S5720S switches with multiple 10G optical ports, you can configure logical ports for stacking or uplink aggregation. For example, the first two 10G ports can be logical port 1, and the last two as logical port 2 .Power and Heat Considerations: S5720S-LI models have built-in AC power and natural heat dissipation. No pluggable power modules or fans are required .Firmware Compatibility: Ensure the switch firmware supports the optical modules being used. Some older versions may not support certain GPON or high-speed SFP+ modules .SummaryWhile Huawei S5720S switches allow multiple optical modules, only one port per combo pair can be active, and GPON modules limit the use of other optical ports. Proper module selection, port configuration, and diagnostics are essential for stable multi-optical deployment. Use the VRP commands to monitor port status and ensure module compatibility to avoid connectivity issues .