Our wireless network at work...Cisco 4402 WLAN controller and 33 Aironet 1230 access points. One particular access point is mounted on an inside wall, there is a hole punched through the wall, and it is connected to an AIR-ANT2465P-R antenna. It is mounted externally to the parking lot so LEOs can pull up and upload video from the DVR systems in their cars.
Today, sitting in my truck with my laptop about 60 feet away, I had a Very Good to Excellent signal at 54mbps. If I pulled a file off one of our file servers, I get the max speed I'm expecting. If I upload a file to a server, it is extremely slow and sometimes just stops altogether. If I pull up within 15 feet of the antenna, same results. The LEOs are complaining about slow upload times for the DVRs and rightfully so as I have discovered.
There is another Cisco aironet inside the building. I have not yet taken my laptop inside to connect to it and test. The WAPs are running on different channels, 1 and 11. No other wireless networks around according to NetStumbler.
How do I begin troubleshooting this?