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question about downstream on CM1200 modem
I have a new CM1200 Nighthawk Multi-Gig Speed Modem and a X500 Nighthawk Gaming Router both have been working fine, but lately the second light on the CM1200 constantly blinks. We still have inter...
You can pick them up off amazon for pretty reasonable. I'd snag at least a 6dbmv one. I recently bought a 3,6, 9 just to play with my signal levels on my modem at home for pretty cheap
Here is the second log file
Your power levels are to high and you have errors in the line.
Your downstream power should be -7.5 to 7.5dbmv. You're above 11. So out of spec.
Plus you have errors.
You can try adding an attenuator to your line or if you're using an amplifier, remove it.
I just had replaced the cable from their connection to modem, not amplifiers, router is all good, then this CM1200 modem. Haven't contacted Spectrum yet really didn't want to hear their flak about it being my equipment, Guess I have no choice. Will adding an attenuater really help?
Yes.
Thank you I will be back with results soon, ( I hope ). Where would I go to get an attenuater?
1madmouse wrote:I just had replaced the cable from their connection to modem, not amplifiers, router is all good, then this CM1200 modem. Haven't contacted Spectrum yet really didn't want to hear their flak about it being my equipment, Guess I have no choice. Will adding an attenuater really help?
Yes, it will. Remember, the signal power levels are the responsibility of and under the control of your ISP. If you add an attenuator and your ISP makes changes, you will have to make changes in response. Best to stand up to the flak and get your ISP to adjust their signal power levels.
Your modem is designed for input power levels between -7 dBmV and 7 dBmV. Reference here at the top:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
When the power levels are outside that range, errors are introduced and your lights start blinking.
Here is a link to an attenuator on Amazon. They come in various sizes. If you get one, be sure to power down your modem before you insert the attenuator in the line and then power it back up. https://a.co/d/8yfuKqP
