CM1200 + R7000 speed issues

Aspirant

Jun 25, 2023

Thanks for your response

With a direct Ethernet connection between your CM1200 and a computer of some type you report 200 Mbps throughput. You should see something around 940 Mbps due to the limit of a single 1 Gbps output port. I agree

What operating system is running on that computer? Mac? Windows? If Windows, what version?

Windows 10

Are you sure the Ethernet cable is in good condition and at least a Cat 5e or better? Look on the cable insulation.

The cable is one that came with the modem when I purchased it

How are you measuring your throughput? Web browser? ISP test site? Recommend you download and install the Ookla stand alone test application. It eliminates web browsers and web sites from the test process.

xfinity suggests speedtest.xfinity.com

I also tried ookla (I will download it and try as you suggested)

The power levels you show are low, near the low end of the specification. Netgear modems specify power levels between +7 dBmV and -7 dBmV with ideal right at 0 or a little higher. For reference: https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router

Ok. I must say the coax cable in the house is as old as the house (40 years)

I will look at your link. Who can adjust power levels?

Kitsap
Master
Jun 25, 2023
Recent Windows updates have incorporated some new default features relative to network profiles. On your computer, go to Settings -> Network & Internet -> Status -> Ethernet Properties and make sure your network profile is set to private. If it is public, Windows throws a bunch of firewall features in your way that can limit throughput. A new modem is considered a new network by Windows and you might run in to the same thing again when you put your R7000 in play. If it is set to public, change the profile, restart your computer, and repeat the throughput test direct connected to your modem. Be sure your computer has a 1 Gbps Ethernet port and the Ethernet port drivers are up to date from your computer manufacturer.

For your own satisfaction, look at the outside insulation on your Ethernet cable to ensure it is Cat 5e or Cat 6. What did you find?

Be sure you install the Ookla stand alone test application and do not use a web browser and a web address for throughput testing.

Power levels are the responsibility of your ISP. Depending on what plan you purchase, the ISP may consider their responsibility to end at the connection box at your house and not at the connection to your modem. I recall Xfinity has an optional inside wiring add-on to your bill where they take responsibility for the wiring right up to the connection on your modem. You should check before you find yourself being billed for inside wiring work.

Do you have any coax splitters inside your house? Each one in series can reduce your power levels by 3.5 dB or 7 dB.

Regardless of when you bought it, the design of your R7000 is getting a little long in the tooth. Even so, it should handle nominal 1 Gbps throughput at the Ethernet ports. It will not be the same over Wi-Fi. The R7000 is not on the official End of Service list from Netgear.
- keeve
  Aspirant
  Jun 26, 2023
  Thank for your response...
  Recent Windows updates have incorporated some new default features relative to network profiles. On your computer, go to Settings -> Network & Internet -> Status -> Ethernet Properties and make sure your network profile is set to private. If it is public, Windows throws a bunch of firewall features in your way that can limit throughput. A new modem is considered a new network by Windows and you might run in to the same thing again when you put your R7000 in play. If it is set to public, change the profile, restart your computer, and repeat the throughput test direct connected to your modem. Be sure your computer has a 1 Gbps Ethernet port and the Ethernet port drivers are up to date from your computer manufacturer. (it was set to public. I will retest at the next opportunity)
  
  For your own satisfaction, look at the outside insulation on your Ethernet cable to ensure it is Cat 5e or Cat 6. What did you find? I am not sure I understand this. I will google to understand it better
  
  Be sure you install the Ookla stand alone test application and do not use a web browser and a web address for throughput testing. ( I did that. Not much difference in speedover wifi. )
  
  Power levels are the responsibility of your ISP. Depending on what plan you purchase, the ISP may consider their responsibility to end at the connection box at your house and not at the connection to your modem. I recall Xfinity has an optional inside wiring add-on to your bill where they take responsibility for the wiring right up to the connection on your modem. You should check before you find yourself being billed for inside wiring work.
  The wiring is 30+years old. I will check in the attic to see if there are splitters. There might be)
  
  Do you have any coax splitters inside your house? Each one in series can reduce your power levels by 3.5 dB or 7 dB.
  
  Regardless of when you bought it, the design of your R7000 is getting a little long in the tooth. Even so, it should handle nominal 1 Gbps throughput at the Ethernet ports. It will not be the same over Wi-Fi. The R7000 is not on the official End of Service list from Netgear.
  - plemans
    Guru - Experienced User
    Jun 27, 2023
    Your logs are indicating a line issues.
    
    so check the whole line.
    
    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.

Forum Discussion