In reading pg 77 of TC of Airport Network (2.0), it appears that my speeds are slower than they "should" be given my reading of the TC book. And 4 of the devices are located in the same office as the Airport Extreme.
I've added a screen shot with the data. Here is the list of devices.
Thank you for any suggetions.
...69: iPhone 4 (in same office)
...F3: printer (same office)
...91: Airport Express (different floor, no devices connected to it)
...58: MacBook Air (same office)
...FB: Airport Express (outside office door)
...4E: MB Pro (sam office)
...EF: Apple TV (different floor)
Here is image:
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EMPLOYEE1iPhone 4: it has only single-stream 2.4 GHz 802.11n, so the rate you're seeing is close to its highest capability. The printer probably has 802.11g. The AirPort Express has too many obstructions that block 5 GHz traffic to reach higher rates. You may want to lock it into 2.4 GHz mode.
The other rates aren't surprising. While 270 Mbps is the best, the other three devices are likely hitting some interference, reflection, or obstruction that slows them down.
It's quite unlikely that you'll have multiple devices achieving their highest possible rates unless they're in a direct line of site to a base station and not in each other's way.