@Shahrin 

The uplink is using Cat6

  @Shahrin 

Shahrin wrote

Hi,

I have 2 TL-SG1024D switch that linked.

But the uplink speed is only 100Mbps.

Is there a limitation of the switch?

Thanks

Both uplink and downlink should be at least CAT5e cables.

And your uplink router or device should be equipped with gigabit Ethernet port. Same for the client device if you expect to get more speed.

  @Clive_A 

The cable is using Cat6 .. All Desktop connected to both switch can get speed of 1Gbps .. 

Only speed connection between both switch is 100Mbps only .. here is the sample diagram .. how to make the uplink to be 1Gbps??