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switch is as follows：
1、Grab the fiber module from the side and insert it
smoothly along the switch SFP port slot until the fiber module is in
closer contact with the switch.；
2、Confirm the Rx and Tx ports of the fiber module when
connecting. Insert one end of the fiber into the Rx and Tx ports to
ensure that the Tx and Rx ends of the interface are correctly
connected. The other end of the fiber is connected to another
device.；
3、After power-on, check the status of the corresponding
indicator. If the indicator is on, the link is up. If the indicator is off,
the link is down. Check the line and confirm that the
Corresponding device is enabled.
Note:
It is not allowed to excessively bend the fiber, and its radius of
curvature should be no less than 10cm ;
Ensure the cleanliness of the fiber end face;