@Clive_A Hi, I have to little bit change the configuration on RACK1. I change the POE switch SG3428XMP (firmware 3.20.0 Build 20231019 Rel.60485) v3.2 to SG3452X v1.20 (firmware 1.20.2 Build 20240115...

@Clive_A Hi, no this is the speed when I have no problem with connections and DON´T use the SM5310-T ver 1.2 modules. Do you want the result with the modules?

@Clive_A Hi, this is the Iperf statistic. I used old PC but both witch 1Gbps LAN card. First is PC(rack1) - SW - 40m (CAT6A FTP) - SW - PC(rack2) thru metalic CAT6 patch cable from patch panel Second...

@Clive_A Hi, pls help where can I find the latest firmware for SG3428XMP?? On this website https://www.tp-link.com/us/support/download/tl-sg3428xmp/ I can´t find the version 3.2 and the correct...

@Clive_A If I connect PC to R1 SWITCH everything works fine (internet access (200Mbps, OC200, etc.) but if I connect PC to R2 Switch and try speedtest.net (speed is 0,7Mbps) or connect to OC200...

@Clive_A with this configuration internet speed dump to 10Mbps in 3 minutes after use the SFP+ on both side. :(