Can a CRS309 switch be connected to a CRS125 via the SFP+ and SFP ports, respectively, using a Cable Matters 10GBASE-CU DAC Twinax cable? I tried it myself, but couldn't get it to work. I was able to set the CRS309 SFP+ port's link speed to 1GB, which got me some link lights, transmit activity, and "link up" status. But, nothing on the receive side at all. I got nothing on the CRS125 switch at all. No link lights on the SFP port and a "no link" status in the web interface. I contacted the Cable Matter Rep and he said that it should work, but that I should check with Microtik to confirm the compatibility of these two switches connecting together like that. Any help will be greatly appreciated.