Ruijie RG-AP840-I (V2) Hardware Installation And Reference Manual page 39

Hardware Installation Guide
Table 7-3 FP module wiring layout
Port Type
LC
Caution

For the SFP module of which wiring distances is more than 40 km (including 40 km), if a short-distance
single-mode fiber is used, an in-line optical attenuator should be inserted into the link to avoid overloading
the optical receiver.

The SFP module is a laser transmitter. Do not look directly at the light source to protect eye safety.

To protect the cleanliness of the SFP module, use a dust cover when the optical fiber cable is not connected.
Fiber Type Core Specification (um)
Single mode 9/125
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Appendix
Max. Wiring Distance
0.3 km