I have a SRW2048 connected back to a Cisco 6509 core switch. For some reason, I cannot establish a gigabit connection with our computers. Both Lenovo laptops and Dell desktops are failing; they always end up falling back and negotiating at 100/full. The port used to uplink back to the 6509 seems to connect at gig, and the port status on both the 2048 and the 6509 indicate that there is a gig connection between them. But any of my computers connected to the 2048 cannot get a gig connection. Can anyone help??