For information according to Delock "This media converter is best used for symmetrical 10 Gbps connections. For asymmetrical connections (10 Gbps to 1 Gbps) we recommend the Delock media converter 86861. https://www.digitec.ch/de/s1/product/delock-medienkonverter-10gbase-r-sfp-zu-10gbase-t-rj45-netzwerk-zubehoer-39776303