i support a small office that has Comcast internet and it is set to put out at least 75 Mbps download and 15 Mbps upload...when i plug my laptop in various locations throughout the network, the speedtest.net and speedtest.comcast.net speeds vary wildly, but consistently, and i can't figure out why...here is what i mean:
all connections are via ethernet cable and from my own laptop...
1) directly plugged into the cable modem: 85 Mbps down, 16 Mbps up
2) plugged into the router that is plugged directly into the modem: 85 down, 16 up
3) plugged into a managed 24 port Linksys PoE SFE2000P switch (gigabit uplink) that has all of the VoIP phones and computers and other switches connected to it: 40 down, 16 up
4) plugged into an unmanaged 24 port Linksys switch that is uplinked to the previous switch (gigabit uplink) and has a few phones and computers connected to it: 16 down, 16 up
again, the speeds are consistent at the various points i plug in, but always lower than they should be and what the modem is churning out directly...what would cause this? how do i get full speeds throughout the office?