A stack of Express 10/100 Stackable Hubs can contain hubs running at both 10 and 100 Mbps. However, the hubs running at 10 Mbps and the hubs running at 100 Mbps are on separate network segments. These two segments can't communicate with each other unless you use another device to bridge them. Intel Express 10/100 Downlink is used to bridge these segments.??The Express 10/100 Downlink has two ports that operate at either 10 or 100 Mbps. Each port automatically senses the speed of the attached device. All you need to do is set the speed of the hubs. No configuration of your network operating system is needed. The benefits of using the Downlink are its low cost and simplicity. Just plug the hubs into the Downlink; it takes care of the rest.