This topic explains the possible causes of optical module faults and provides solutions.
After you insert an optical module into a Smart Access Gateway (SAG) device, the indicator does not turn green.
The optical module is incompatible or damaged.
- A multi-mode optical module emits visible light. If you can see a red laser on the
left of the sending port, the module is working normally. Do not look directly into
the sending port.
A single-mode optical module emits invisible light. You can use a jumper to connect the sending port and the receiving port. If the indicator turns green, the module is working normally.
- If the indicator still does not turn green, check whether the optical module is compatible with the device.