TP-Link MC210CS Troubleshooting Instructions page 2

Troubleshooting Instruction
1. In application scenario 1, plug the suitable SFP modules into the SFP slots and
then connect them with the proper fiber, then the connection should be OK.
Q1: Why the LED of the SFP slot isn't on after plugging the SFP module?
The status of the LED has no any change when we plug the SFP module only.
Only when all the connection is OK can the ports' LED lights go on.
Q2: How can I tell the RX & TX port of the SFP module?
On the SFP module, you can see two triangles as is noted in the picture below, the
pole towards outside means Tx (Transmit) port while the pole towards inside
means Rx (Receive) port. When we connect the
and Rx are matched on both sides, which means Tx <--> Rx, Rx <--> Tx.
Q3: How can I judge the SFP module is working with the switch?
For multi-mode SFP module, since the wave length of the multi-mode in the range
of visible light, we can see the red laser from the Tx port when we plug the SFP
module into the SFP slot. And when we plug the fiber, we can also see the red
laser from the end of the fiber that connected to the Tx port. But for single-module
SFPs,we need to make sure the Tx