I have Netgear CM1150v which has never given upstream speeds over 18 mbps for contracted speed of 20 mbps. Recently Xfinity upgraded the upload speed to 100 mbps and I am still getting 11 mbps. The issue was referred to Netgear support with event logs and channel power levels. They suggested T3 errors and so Xfinity technician was scheduled to check it. Technician checked everything and in the end checked the speed from the cable where it connects to the modem. Upload speed capability was over 400 mbps and download over 2000 mbps. Still Netgear CM 1150v refuses to give these speeds. Xfinity technician then showed only 4 upstream channels are being locked (which support only 22 mbps) and used in the modem. Xfinily has a fifth channel open for upload that supports over 400 mbps that the techniciam showed on his tool. Can Netgear lock and use this channel or is this cable modem useless for getting better upload speeds? This is a DOCSIS3.1 cable modem and poor upstream speeds are disappointing. Any suggestions for resolution?

Replaced CM1150v with Hitron Coda for just $85 and am getting over 119 mbps upload speeds. Netgear either needs to provide latest FW to support their products as advertised as DOCSIS3.1 or stop selling them. Total waste of money on this overpriced CM1150v

What Firmware version is currently loaded?Please post a copy and paste of the modems connection status and event log page.https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-routerhttps://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router

BMDk11 wrote:I have Netgear CM1150v which has never given upstream speeds over 18 mbps for contracted speed of 20 mbps. Recently Xfinity upgraded the upload speed to 100 mbps and I am still getting 11 mbps. The issue was referred to Netgear support with event logs and channel power levels. They suggested T3 errors and so Xfinity technician was scheduled to check it. Technician checked everything and in the end checked the speed from the cable where it connects to the modem. Upload speed capability was over 400 mbps and download over 2000 mbps. Still Netgear CM 1150v refuses to give these speeds. Xfinity technician then showed only 4 upstream channels are being locked (which support only 22 mbps) and used in the modem. Xfinily has a fifth channel open for upload that supports over 400 mbps that the techniciam showed on his tool. Can Netgear lock and use this channel or is this cable modem useless for getting better upload speeds? This is a DOCSIS3.1 cable modem and poor upstream speeds are disappointing. Any suggestions for resolution?Your CM1150v is not on the Xfinity list of customer owned modems that is compatible with their upgraded Next Gen speed tiers. Some good background information from Xfinity is available here: https://www.reddit.com/r/Comcast_Xfinity/wiki/knowledgebase/next-generation-internet/

Thanks for the Xfinity approved modem list. I have the list and will change the modem. But my question is about why this DOCSIS 3.1 modem cannot support that speed. I bought a DOCSIS3.1 with better speeds so I didn’t have to upgrade for 5 years but looks like promise of DOCSIS 3.1 capability was not true and money went waste. If it cannot support the speeds then stop selling it.

The CM1000 and 1100 series only supports up to 1Gb due to the WAN Ports are maxed out at 1000Mpbs. Nothing beyond that. Most ISP support a 1Gb speed tier. However CC and XF last year started a mid split in there new speed tiers that they set up for 800Mpbs and a 1.2Gb speed on the down side. No idea why they couldn't keep the 1Gb tier however probably best way for them to support the higher 1.2Gb speeds they started pushing. Yes this also caused problems on the user or user owned modem side of things and the 1Gb supporing modems could not get the full 1Gb speeds anymore and had to fall back to 800Mpbs for those 1Gb supporting modems as 1.2Gb was not achievable by these modems. This is only seen with CC/XF ISP. My ISP Sparklight still has a 1Gb speed tier service. No idea if or when they will push that beyond. So you have an option to ask the ISP for the lower speed 800 tier which this modem would be supporting of, or get in to a newer CM2000 series or wait for the awaited CM3000 series modems that have WAN ports that start at 2.5Gb connection rated speeds and then you could get the 1.2Gb or higher speeds that seem to be coming out by the ISP. No idea if or when the CM3000 will be officially released to market. NG doesn't publish that info. So you'll need to wait for find another brand that suites your needs.

I have Netgear CM1150v which has never given upstream speeds over 18 mbps for contract 20mbps

11 Replies

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FURRYe38
Guru - Experienced User
Dec 26, 2023
What Firmware version is currently loaded?
Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router
Kitsap
Master
Dec 26, 2023
BMDk11 wrote:
I have Netgear CM1150v which has never given upstream speeds over 18 mbps for contracted speed of 20 mbps. Recently Xfinity upgraded the upload speed to 100 mbps and I am still getting 11 mbps. The issue was referred to Netgear support with event logs and channel power levels. They suggested T3 errors and so Xfinity technician was scheduled to check it. Technician checked everything and in the end checked the speed from the cable where it connects to the modem. Upload speed capability was over 400 mbps and download over 2000 mbps. Still Netgear CM 1150v refuses to give these speeds. Xfinity technician then showed only 4 upstream channels are being locked (which support only 22 mbps) and used in the modem. Xfinily has a fifth channel open for upload that supports over 400 mbps that the techniciam showed on his tool. Can Netgear lock and use this channel or is this cable modem useless for getting better upload speeds? This is a DOCSIS3.1 cable modem and poor upstream speeds are disappointing. Any suggestions for resolution?
Your CM1150v is not on the Xfinity list of customer owned modems that is compatible with their upgraded Next Gen speed tiers.

Some good background information from Xfinity is available here:
https://www.reddit.com/r/Comcast_Xfinity/wiki/knowledgebase/next-generation-internet/
- BMDk11
  Tutor
  Dec 26, 2023
  Thanks for the Xfinity approved modem list. I have the list and will change the modem. But my question is about why this DOCSIS 3.1 modem cannot support that speed. I bought a DOCSIS3.1 with better speeds so I didn’t have to upgrade for 5 years but looks like promise of DOCSIS 3.1 capability was not true and money went waste. If it cannot support the speeds then stop selling it.
  - FURRYe38
    Guru - Experienced User
    Dec 27, 2023
    The CM1000 and 1100 series only supports up to 1Gb due to the WAN Ports are maxed out at 1000Mpbs. Nothing beyond that. Most ISP support a 1Gb speed tier. However CC and XF last year started a mid split in there new speed tiers that they set up for 800Mpbs and a 1.2Gb speed on the down side. No idea why they couldn't keep the 1Gb tier however probably best way for them to support the higher 1.2Gb speeds they started pushing. Yes this also caused problems on the user or user owned modem side of things and the 1Gb supporing modems could not get the full 1Gb speeds anymore and had to fall back to 800Mpbs for those 1Gb supporting modems as 1.2Gb was not achievable by these modems. This is only seen with CC/XF ISP. My ISP Sparklight still has a 1Gb speed tier service. No idea if or when they will push that beyond.
    
    So you have an option to ask the ISP for the lower speed 800 tier which this modem would be supporting of, or get in to a newer CM2000 series or wait for the awaited CM3000 series modems that have WAN ports that start at 2.5Gb connection rated speeds and then you could get the 1.2Gb or higher speeds that seem to be coming out by the ISP. No idea if or when the CM3000 will be officially released to market. NG doesn't publish that info. So you'll need to wait for find another brand that suites your needs.

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I have Netgear CM1150v which has never given upstream speeds over 18 mbps for contract 20mbps