Spectrum Gig CM1100

Been down that road a couple of times. Spectrum is very resistant to debug this since this is a customer owned modem... I am going to try to go to the Spectrum store today to get a Spectrum modem to check the signal to a Spectrum issued modem. 

OK, let us know how it goes...

Spectrum internet support told me to go to the local Spectrum store to pick up a DOCSIS 3.1 modem, only to find out they have been out of stock for 1 week of the only DOCSIS 3.1 modem Spectrum issues. They told me to call the call center who told me they can't request model types or technology associated with the modems reuqested... This is rediculous since Spectrum refuses to troubleshoot my signaling coming to my modem for the 3.1 standard and it is nearly impossible to obtain the only Spectrum support modem with 3.1.....

Sounds like your stuck between a rock and a hard place. 

Is the Arris SB8200 or Motorola MB8600 supported on Spectrum? 

Yeah I am not sure what to do. I am hoping they send me the DOCSIS 3.1 modem, but won't know until next week. If they don't, I am likely going to return the CM1000 and purchase the CM700 since the CM700 is listed as Approved for Spectrum internet < 400Mbps. The CM1000 is only "Minimally Qualified Modem".... I posted the link to the modems they approve and provide. The MB8600 and the SB8200 are minimally qualified as well. There is not a single modem a customer can buy that is approved by Spectrum and that supports DOCSIS 3.1. What a joke.... 

https://www.spectrum.net/support/internet/compliant-modems-charter-network/

I strongly believe this is a signaling issue on Spectrums end. My CM1000 is 32x8 channel bonding, but it is only using 24x4. I am hoping that the new modem they ship me is at least 32x8 even if it doesn't support DOCSIS 3.1. Atleast then, if the signaling isn't getting the 32x8 on their hardware, it is clear that the problem is on their end and not the CM1000. My other thought is, purchasing the CM700 (since it is approved) and trying to get all 32x8 channels. This could be difficult since Spectrum is quick to not support customer owned hardware.... even if it is on their authorized modems site...

Additionally in an attempt to resolve the signaling issue, I took my modem into my basement where the coax comes in from outside and plugged my modem in directly there. Same results. Tried a number of different RG6 coax that I had laying around and made no difference. I ordered some new high end coax cables and a coax connecter the supports 3 GHz. I doubt this will make a difference, but at this point, I am not leaving anything out!

Ya, have a friend that's on spectrum. Has told me stories of them not working well. Small support list of modems. 

Well the CM700 may do better. Unfortunately it's a Intel chipset based modem thus has known issues of there own with vulnerabilities. Can review this info here:

http://www.badmodems.com

The CM1100 is broadcom based and is preferred. I've enjoyed mine though I haven't had a change to test on it for a while. Been testing other modems. :smileywink:

I see others have had issues as well:

https://community.netgear.com/t5/Cable-Modems-Routers/CM1100-Cable-Modem-NOT-Charter-Spectrum-Compatible/m-p/1767453#M17974

Not sure if vkdelta can be of any help here or not. 

Are you getting all 32x8 channels and the 2x2 OFDM locked by Spectrum on the CM1100?

Spectrum just sent me shipping confirmation for the Spectrum issued modem being sent from their warehosue. Here are the notes... I am assuming this is the Arris TM3402 or the Spectrum brand modem (didn't know that existed / see link). Too bad they didn't ship me a small UPS with it :P

https://d15yx0mnc9teae.cloudfront.net/sites/default/files/Spectrum_D31_eMTA_Data_Sheet.pdf

Equipment Shipped: D3.1 WIRED EMTA W/O BATT

This is what Arris shows for that model#:

https://www.arris.com/products/touchstone-tm3402-emta/