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Forum Discussion
C7800 Wifi speed is slow
I just bought C7800 several days ago, because I need DOCSIS 3.1 model to support gig speed of Comcast.
Then I notice the speed of 5G wifi only have 400Mbits and it should be near 900Mbits to 1000Mbits. I call xfinity and they send a guy come and test wired on their test device. The speed is 900+Mb.
I have tried:
1. reset device.
2. change wireless channel to other number instead of 153.
None of them can make my wireless speed faster than 400Mbs.
Test method: speedtest.net and xfinity.speedtest.com.
Firmware Version: V3.01.43
Does anyone have solutions of this issue?
17 Replies
how are you testing and with what kind of device? based on your description, I suspect your wifi device doesn't support higher speeds. Also keep in mind that the advertised speeds on the package are theoretical and you'll never fully reach them due to various reasons
MacBook Pro 2018, internet interface up to 1.3Gb, test via Speedtest.net and Speedtest.xfinity.com.
iphone X and iPad Pro, test via speedtest application.
Does your C7800 support HT 160 Mhz? If so, turn it on and test again. You can find that setting in Advanced -> Advanced Setup -> Wireless Setting. The option on my R7800 (and I assume the C7800 too) is located at the bottom of that page
The C7800 is a modem/router. Anything else on the network? Another router?
C7800 is only MY router. However, there are lots of neighbors' wifis I can find in my apartment. So I think the answer might be "No, C7800 not the only router in my area"
ccqpein wrote:
C7800 not the only router in my area
That wasn't my question.
Anything else on the network?
Forgive me for being vague, perhaps I should have said your network.
What are your current wifi settings for 2.4 and 5Ghz?
HT160Mhz is not supported on the C7800.
