S4112F operation on 1 Gbit

Hi there, Does anyone know if the S4112F switches can operate on 1 Gbit/s? The spec sheet mentions "The S4100-ON series are high-performance, multi-function,1/10/25/40/50/100 GbE" However I see only SFP+ modules in the optics list. So can we either use the SFP 1000BASE-T or 1000BASE-SX optics to connect to 1Gbit/s or should we use the Dell Networking Transceiver, SFP+ 10GBASE-T,30m reach on CAT6a/7 or SFP + 10 GBASE-SX and force the port down to 1 Gbit/s? We need to connect our firewalls which have only 1Gbit-T or SFP. Thanks.