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5GHz WiFi

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New user here-2nd day with COMCAST HSI Performance Tier 25/5 with a Cisco DPC3939 gateway router(no phone service) on an older XPpro SP3 rig I've a question regarding the 5Ghz WiFi- From my laptop I cannot see the 5Ghz network only the 4Ghz as well as any networks in my neighborhood. From the router I can see that both the 4 and 5Ghz networks are active. My laptop WLAN card has the latest drivers. I cannot even add the 5GHz network thur the laptops' WLAN utility-it doesn't see it- only the 4GHz network is shown as well as others in my neighborhood. This occurs when attempting to added either a broadcasting or non broadcasting network. Obviously I'm doing something wrong- Could someone point me in the right direction. FYI- Speedtests (speedtest.net) show 28Mbs DWN and 6MBs up on the desktop and 20/6 on the laptop. Both have very good PING with zero packet loss after I changed the RWIN to 300000. I wanted to play with the 5Ghz network to see if there was any difference between the two..... TIA- LOU

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