I have 2 meraki switches using fiber optic interconnect but they are not connected， but the red light can be seen through the laser pointer test.   2 * MERAKI MS120-24 2 * SFP+ Transceiver, 10G LC Single Mode Module 1310nm 1 * SingleMode LC to LC Fiber Patch Cable Optical Cables Duplex 1G/10GB SMF Fiber Jumper LSZH Patch Cords 9/125µm， 250ft ... View more