Hi, as you stated, 1G is not specifically mentioned. [URL] Take a look at the port groups here [URL] and you can check this thread "The switch auto-negotiates to 1GbE when the laptop is connected." Solved: DELL S5248F-ON - Dell Community 
I have a couple of S5224F-ON switches, and a box load of 1Gbps SFP's, but i cant seem to make them work. A show int clearly shows the switch can see the SFP's, but i havent been able to get the connected servers to get an up link to them. The literature for the S5224F-ON lists it can run its ports at 25G and 10G, but it doesnt specifically mention 1G. I know the speed for ports has to be set through the port-group, but when i try to do that, it only lists 25g-4x and 10g-4x. There is no 1g option.   Show interface output: PER1-SWI-01# show interface ethernet 1/1/24Ethernet 1/1/24 is up, line protocol is downHardware is Eth, address is c4:5a:b1:0a:98:1dCurrent address is c4:5a:b1:0a:98:1dPluggable media present, SFP type is SFP 1000BASE-TWavelength is 0Interface index is 37Internet address is not setMode of IPv4 Address Assignment: not setInterface IPv6 oper status: DisabledMTU 1532 bytes, IP MTU 1500 bytesLineSpeed 0, Auto-Negotiation offConfigured FEC is off, Negotiated FEC is offFlowcontrol rx off tx offARP type: ARPA, ARP Timeout: 60Last clearing of "show interface" counters: 00:31:38Queuing strategy: fifoInput statistics:0 packets, 0 octets0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts0 Multicasts, 0 Broadcasts, 0 Unicasts0 runts, 0 giants, 0 throttles0 CRC, 0 overrun, 0 discardedOutput statistics:0 packets, 0 octets0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts0 Multicasts, 0 Broadcasts, 0 Unicasts0 throttles, 0 discarded, 0 Collisions, wred dropsRate Info(interval 30 seconds):Input 0 Mbits/sec, 0 packets/sec, 0% of line rateOutput 0 Mbits/sec, 0 packets/sec, 0% of line rateTime since last interface status change: 00:31:39   Here you can see when trying to configure the port group, it only shows 25g and 10g: PER1-SWI-01(conf-pg-1/1/6)# show configuration!port-group 1/1/6mode Eth 25g-4xPER1-SWI-01(conf-pg-1/1/6)# mode eth25g-4x Breakout to 4 25G interfaces10g-4x Breakout to 4 10G interfaces   The SFP is a Dell SFP-1G-T-WP, which does list the S5224F-ON as being compatible.   What am i missing? Thanks  
1000BASE-T SFP's in an S5224F-ON