If you are using patch panels in the middle, make sure you are connecting to the correct ports. Switch A -> Port 15 to Switch B -> port 15 where again the modules are the same and the cables are the same. The physical connection would look like this: Usually we would connect the same port number on both switches, but that’s not required. If our switches are in different locations and the distance is over 400m or 1300ft or 0.2mi (yeah I love that distance conversion), we will need to use a LW (Long Wave) module, which in general has as blue latch, and to use SM cables (Single-Mode) for long distances. If the switches are close to one another, we can use a standard SW (Short Wave) module with a minimum of a OM3 (Blue) cable or Multi-Mode cable.
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