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Forum Discussion
CM2000 Download Speeds Dropped Significantly
Hello, my CM2000 has worked well for 3 years, but for a month now the speeds have dropped significantly. I was on a 1 gig plan but recently downgraded to a 250 Mb plan thinking it was COX fault. After some troubleshooting though it seems to be the modem. I get anywhere from 5-30 Mb/s for downloads. When I factory reset the modem, it jumps up to 300 Mb/s for a couple minutes until it drops back down to the previous speeds after every time. Uploads are good.
8 Replies
got a copy of the cable connections page and the event logs? those help check the line as cox's first response is always "it isn't our line"
Thanks and yeah, I have them right here:
Also worth noting the downstream LED is blinking.
You've got errors in your lines. Your power levels are technically within spec but not really.
Reason I say that is you're a little hot on your power levels and they should be within 3.5dbmv of each other. You're going from a 9 to a 4.3. so 4.7dbmv difference.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
If you can, simply connect the modem right where the coax comes into the home. This prevents wiring in the home from being the issue. And some ISP’s charge if the wiring issue is in the home. So this helps prevent this.Once that's done, and you have a set power range that's closer in spec, then you could add a attenuator back in. Make sure its a good one
