Reasons and solutions: The main reason is that the optical module is incompatible. If it is incompatible with the switch brand, you can directly replace the optical module. When a ZXR10 switch comes online but ports stay down, the root cause is often optics mismatch: the wrong wavelength, an unsupported DOM flavor, or a transceiver that simply does not pass ZTE's compatibility checks. Verify Switch and Module Compatibility Check the switch manufacturer's compatibility. SFP issues are among the most common and frustrating problems in fiber optic and Ethernet networking environments. Whether you are dealing with a no link light, intermittent connectivity (link flapping), or a transceiver not detected error, the root cause is often not immediately obvious. The TE ZXHN F660 ONT supports GPON (Gigabit Passive Optical Network) technology. In GPON systems, downstream data is transmitted at a wavelength of 1490 nm, and upstream data is transmitted at a wavelength. A mismatched SFP module can brick ZTE OLT C320/C300 boards. It does not necessarily reflect.
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