Reduced Upload Speed 1 Gigbit Internet when using own Modem CM1200 NetGear

[Dusan1]

When I have installed and activated my own modem (Netgear CM1200) upload speed has been greatly reduced and limited to around 6mbps. When I use Xfinity XFI getaway upload is back at usual around 40 Mbps. I still didn't return Xfinity XFI getaway in order to make sure I can isolate issue and troubleshoot. Download speeds are better with CM1200, wired or Wifi (using new Wifi 6 Orbi Mesh system) but Upload speed seems to be capped. 

[EG]

Can't see your pics. Since you are a new poster, they need to be approved by a Forum Admin. That could take some time. In the interim, you could try hosting them at one of those free third-party pic hosting sites like Imgur or Photobucket and post the link to them here.

[Dusan1]

Got it. Here are the links

https://www.dropbox.com/s/gtyn3tv5isub5lm/download.png?dl=0

https://www.dropbox.com/s/vx6xahl9xo7avjh/upload.png?dl=0

https://www.dropbox.com/s/xem57olzmayc2ja/startupp.png?dl=0

[Dusan1]

Startup Procedure

Procedure Status Comment Acquire Downstream Channel 693000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enabled BPI+ IP Provisioning Mode Honor MDD honorMdd(4)

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 29 693000000 Hz 2.5 dBmV 41 dB 0 0 2 Locked QAM256 2 531000000 Hz 2 dBmV 40.6 dB 0 0 3 Locked QAM256 3 537000000 Hz 2.3 dBmV 40.7 dB 0 0 4 Locked QAM256 4 543000000 Hz 1.9 dBmV 40.6 dB 0 0 5 Locked QAM256 5 549000000 Hz 2.1 dBmV 40.8 dB 0 0 6 Locked QAM256 6 555000000 Hz 1.9 dBmV 40.7 dB 0 0 7 Locked QAM256 7 561000000 Hz 1.7 dBmV 40.6 dB 0 0 8 Locked QAM256 8 567000000 Hz 1.9 dBmV 40.7 dB 0 0 9 Locked QAM256 9 573000000 Hz 1.8 dBmV 40.8 dB 0 0 10 Locked QAM256 10 579000000 Hz 1.9 dBmV 40.5 dB 0 0 11 Locked QAM256 11 585000000 Hz 1.9 dBmV 40.7 dB 0 0 12 Locked QAM256 12 591000000 Hz 2.2 dBmV 40.8 dB 0 0 13 Locked QAM256 13 597000000 Hz 2.3 dBmV 40.7 dB 0 0 14 Locked QAM256 14 603000000 Hz 1.8 dBmV 40.7 dB 0 0 15 Locked QAM256 15 609000000 Hz 1.9 dBmV 40.6 dB 0 0 16 Locked QAM256 16 615000000 Hz 2 dBmV 40.7 dB 0 0 17 Locked QAM256 17 621000000 Hz 1.9 dBmV 40.6 dB 0 0 18 Locked QAM256 18 627000000 Hz 1.9 dBmV 40.5 dB 0 0 19 Locked QAM256 19 633000000 Hz 1.9 dBmV 40.6 dB 0 0 20 Locked QAM256 20 639000000 Hz 1.7 dBmV 40.4 dB 0 0 21 Locked QAM256 21 645000000 Hz 1.6 dBmV 40.6 dB 0 0 22 Locked QAM256 22 651000000 Hz 1.8 dBmV 40.7 dB 0 0 23 Locked QAM256 23 657000000 Hz 2 dBmV 40.8 dB 0 0 24 Locked QAM256 24 663000000 Hz 1.9 dBmV 40.7 dB 0 0 25 Locked QAM256 25 669000000 Hz 2.4 dBmV 40.9 dB 0 0 26 Locked QAM256 26 675000000 Hz 2.5 dBmV 40.7 dB 0 0 27 Locked QAM256 27 681000000 Hz 2.2 dBmV 41 dB 0 0 28 Locked QAM256 28 687000000 Hz 2.2 dBmV 41 dB 0 0 29 Locked QAM256 30 699000000 Hz 2.9 dBmV 41.2 dB 0 0 30 Locked QAM256 31 705000000 Hz 2.8 dBmV 41.1 dB 0 0 31 Locked QAM256 32 711000000 Hz 3.1 dBmV 41.2 dB 0 0 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0

Upstream Bonded Channels

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 1 5120 Ksym/sec 35800000 Hz 44.3 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 29400000 Hz 44.5 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 23000000 Hz 44.5 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 16600000 Hz 44.3 dBmV 5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

Downstream OFDM Channels

Channel Lock Status Modulation / Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier Number Range Unerrored Codewords Correctable Codewords Uncorrectable Codewords 1 Locked 0 ,1 37 762000000 Hz 2.2 dBmV 40.9 dB 1108 ~ 2987 225061457 62362987 0 2 Not Locked 0 0 0 Hz 0 dBmV 0.0 dB 0 ~ 4095 0 0 0

Upstream OFDMA Channels

Channel Lock Status Modulation / Profile ID Channel ID Frequency Power 1 Not Locked 0 0 0 Hz 0 dBmV 2 Not Locked 0 0 0 Hz 0 dBmV

[EG]

Everything is well within spec ! For a test, what upload speed do you get with a computer hardwired directly to the CM1200 cable modem (no Orbi  in the mix)  ? You'll need to power cycle the CM1200 when you make the change, and then again when you reinstall the Orbi.

[Dusan1]

Both same - 6mbps. Wired or Wifi same speed. 

Only when I change to Xfinity's leased modem it immediately goes to 40mbps.

No Chance that CM1200 has worse upload compared to Xfinity Technicolor CGM4140COM

So it has to be cap put on during activation put by Xfinity .

Comcast used to be cool company

[EG]

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@Dusan1 wrote:

Both same - 6mbps. Wired or Wifi same speed. 

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I'm not looking for wired vs. WiFi with the router. I'm looking for a test directly to the cable modem. No router in the equation at all. Is that what was tried ?

[Dusan1]

correct

[EG]

O/k so maybe the modem is malfunctioning, it's a Comcast system issue, or it's a provisioning / speed configuration issue. Have you consulted with Customer service about this issue ?

[Dusan1]

Nah, modem just fine, transfered to WOW and problem is gone. Should have done this years ago, instead I was paying for speeds I never had, and non existing equipment and services... After over 10 years, glad I got rid of Xfinity for good. 

[EG]

Topic closed.