Do U have AT&T U-Verse ?
Are you hard-wired or Wi-Fi ? If Wi-Fi only, try to hardwiring from modem/router to one PC.
Have you re-booted the modem/router recently ? Turn off all PCs. Pull the wall power brick from the wall. Wait a few minutes, plug power to the modem/router back in the wall, wait for all the lights to sync, then boot up one pc, check your up and down load speeds with
Speedtest.net by Ookla - The Global Broadband Speed Test
If all else fails, call ATT support, just keep yelling "Agent, agent" when the "canned" message starts. You'll eventually get a low level support agent, who should be able to test your line from the central office to the outside NID (Network Interface Device)
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