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Forum Discussion
Nighthawk® Multi-Gig Speed Cable Modem for XFINITY® Voice (CM1150V) Not allowing full service speed
I recently purchased and installed the new modem as we were upgrading our service from xfinity to the 1000 mbps plan. The install went fine, but my speeds are no where near the 1 gbps that I’m paying for. After hours on the phone with xfinity tech, they feel that the new modem is the bottleneck. They state they can “see” the 1 Gbps coming to the home, but after the new modem, the most I’ve seen is 400 mbps. Is there something I’m missing during the setup? Is there something that I need to change in the modem settings? Any help would be greatly appreciated.
13 Replies
1. Log into the modem and take a screen snip of the cable connections page and the logs and post them back here.
2. Are you directly connected to the modem? Or running through a router? If running through a router, remove it, connect to the modem, reboot it, and then test it.
3. What site are you testing on? many can't saturate gigabit. Try speedtest.xfinity.com
4. what device are you testing on? Kind of key as some older devices can't saturate gigabit as well.
5. make sure the other ports on the back aren't in use (other than phone). It has multiple ports but for xfinity, only port 1 and 2 can be used and they can only both be used if you're router supports wan link aggregation.
Thank you for your reply! To answer your questions:
1) Please see photo.
2) I was connected directly to the new modem. My ASUS router was unplugged?disconnected from the modem. I was connected to port 1.
3) I tested on a few speed test sites, and one of them was the speedtest.xfinity site. The xfinity speed test site yeilded me 252.6 Mbps.
4) I was testing from my laptop. Its an Acer Aspire 6290 series.
5) Only port 1 was being used as mentioned above.
Since the install of the new modem and the hours on the phone with xfinity tech support and "advanced tech support", they scheduled a field tech to come out. I told him what the issues were and he started at the junction box located at the back of the house. This box is where the main run from the street is connected to the cable that runs to the powered amplifier. He found the cable going from the juction box to the powered amplifier damaged. He stated that it looked like a previous tech closed the door on the junction box onto the cable and comprimised it. He also disconnected the main cable run from the street and tested it. He said that the cable was faulting for issues with channel bonding. He said they will need the to replace the cable and ran a temporary RJ6 above the ground from the street box to the junction box on the house. After he did all of that, I performed another speed test and the results were similar. The tech stated that I should be seeing at least in the 900's Mbps. We currently have an RJ11 buried and they will be replacing that with the same. But it still leaves me with just over 252 Mbps speeds when I'm paying for 1Gb.
The new cable has not been buried as yet, but all of the utiliy companies have marked the services.
Also, I can only post one picture?
You can post more pictures but you need to do it on seperate posts. there should be more info to check :)
1. The aspire 6290 was a pretty solid laptop. when it came out 12 years ago. Not saying that is the issue but try several devices. And with a device known to hit gigabit speeds. Having a gigabit port doesn't mean devices will hit full gig speeds. especially with older devices.
2. Try having them re-provision the modem. I've had them send the wrong provisioning file before.
2. Did the tech actually hook up a modem and test it? If they're saying it gets full speeds, have them hook up and prove it. Many times they say "we show full gigabit on our end" but how are they actually seeing that? there's isn't away.
