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Please plug-in the RJ-21 cable with connector tenon as below figures.
4. Uplink Interfaces Connections
The system provides two types of trunk interfaces (two ports for each type). There
are electrical (RJ-45) and optical (SFP) interfaces. When both electrical and optical
ports are connected, system will automatically select the interface according to the
priority setting (Fiber first or Copper first).
SFP (Mini-GBIC):
Prepare a proper SFP module and install it into the optical trunk port. Then you can
connect fiber optics cabling that uses LC connectors or SC connectors (with the use
of an optional SC-to-LC adapter) to the fiber optics connector on the trunk port.