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Forum Discussion
CM1000 v2 Modem - Comcast gig speed
I have the CM1000 v2 running as my modem, and I have comcast as the provider. My speeds range between 300 - 400 mbps but I have the 1 gig plan. I called Comcast and the tech said its because I have ...
You're right. He didn't know what he was doing. I've got a CM1000 and CM1100 and used both on comcast without issues. You should have 31-32 channels locked on downstream, I think 4 on upstream, and 1 ofdma. plus the signal needs to be optimal.
Do you have a screen snip of the modems connections page?
and how are you testing speed? many speedtest sites can't max out speed.
Thanks for the reply.
I attached a screen shot of my connections from the CM1000.
Also I've been testing the speeds through various situations - all wired in. 1. using an older PC and two using my surface computer.
I've tested it through the Netgear NighthawkR8500 router and also directly through the CM1000 modem.
I've used Comcast's speed test and the Speed Test by Ookla (speedtest.net). I've tried a variety of servers as well on speedtest.net.All in all the speed tests are about the same. 300 - 400 through the R8500 router and plugged in direct to CM1000 modem, I got around 500 - 650.
I clearly see I have an issue between the CM1000 modem and the R8500 router, but Im trying to get the speeds right from the CM1000 first before I try and figure out where the slow down is on the router.I'm new to having gigabyte speed, signed up two days ago, so I just began troubleshooting the issue.
You're correct in that you want to get gigabit speeds to the modem first. Good call on that.
In terms of your powerlevels, you're way out of spec. Optimum power levels for downstream are -7dbmv to +7dbmv. acceptable but not optimal is -10dbmv to +10dbmv. Non of yours are within spec.
Is the modem right where to coax enters the home? if not, move it there without any splitters, amplifiers, attenuators and then rerun this. extended runs/amplifiers/attenuators/splitters can all reduce signal strength.
If you still have the same results after moving it or if you've already done that, you'll want your isp to check your line.
Again, thanks for the reply and information. Now I know what to look for in the modem numbers.
I'll do some tests closer to the cable entry point and see if that improves the signal.
