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CM1100-100NAS with 1gbps only getting 500ish on xfinitly speedtest.

New Poster

CM1100-100NAS with 1gbps only getting 500ish on xfinitly speedtest.

Hi, I have 3 issues and not sure if they are all linked up or its indenpend.  

 

The first one is more important, we just got the netgear CM1100-100NAS modem, and upgraded our internet service to 1 gbps from 400mbps plan. But we couldn't get anything higher then 250ish from speedtest.xfinity. I have spoke to a number of L1 support and they couldnt see the issue, and I also spoke to a L2 support. 

 

If I use fast.com, I can get speeds up to 560ishmbps.  After a reboot on the modem, I can get 700ishmbps.  And the speed will continue to drop if I test a second time, a third time and so on and it will stable to around 500ishmbps.

 

When I had the 400mbps plan with the CM1100-100NAS modem, I would get 450+mbps using the speedtest.xfinity.com, but now 1gbps, I get 250ish mbps using the speedtest.xfinity.com.

 

The second issue is when I go to xfinity.com to check on my service status center, our modem CM1100-100NAS sometimes shows Issue Detected.  Sometimes it shows connected.  So this might not be an issue.

 

The third issue we have is the xfinity my account app, it kept on showing my modem is not connected.

 

Can anyone help to see if theres anything wrong with the Modem?  Or should I return this one and try another one. 

 

Thank you

Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency

<tabindex=-1>Startup Procedure</tabindex=-1>
Procedure Status Comment
Acquire Downstream Channel 687000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enable BPI+
IP Provisioning Mode Honor MDD IPv6 only

<tabindex=-1>Downstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked QAM256 33 687000000 Hz 7.1 dBmV 42.8 dB 608887590 0 0
2 Locked QAM256 1 495000000 Hz 7.1 dBmV 43.7 dB 607654262 0 0
3 Locked QAM256 2 507000000 Hz 7.0 dBmV 43.5 dB 607658152 0 0
4 Locked QAM256 3 513000000 Hz 7.1 dBmV 43.7 dB 607662216 0 0
5 Locked QAM256 4 519000000 Hz 7.0 dBmV 43.7 dB 607665921 0 0
6 Locked QAM256 5 525000000 Hz 6.9 dBmV 43.3 dB 607669176 0 0
7 Locked QAM256 6 531000000 Hz 6.9 dBmV 43.3 dB 607673141 0 0
8 Locked QAM256 7 537000000 Hz 7.0 dBmV 43.4 dB 607677198 0 0
9 Locked QAM256 8 543000000 Hz 6.9 dBmV 43.4 dB 607684343 0 0
10 Locked QAM256 9 549000000 Hz 6.7 dBmV 43.0 dB 607688002 0 0
11 Locked QAM256 10 555000000 Hz 6.7 dBmV 43.2 dB 607691617 0 0
12 Locked QAM256 11 561000000 Hz 6.8 dBmV 43.3 dB 607695695 0 0
13 Locked QAM256 12 567000000 Hz 6.7 dBmV 43.1 dB 607699111 0 0
14 Locked QAM256 13 573000000 Hz 6.5 dBmV 43.1 dB 607703071 0 0
15 Locked QAM256 14 579000000 Hz 6.3 dBmV 43.0 dB 607706977 0 0
16 Locked QAM256 15 585000000 Hz 6.0 dBmV 42.9 dB 607711043 0 0
17 Locked QAM256 16 591000000 Hz 5.6 dBmV 42.8 dB 607714473 0 0
18 Locked QAM256 17 597000000 Hz 5.6 dBmV 42.7 dB 607718035 0 0
19 Locked QAM256 18 603000000 Hz 5.6 dBmV 42.5 dB 607722313 0 0
20 Locked QAM256 19 609000000 Hz 5.8 dBmV 42.6 dB 607725611 0 0
21 Locked QAM256 20 615000000 Hz 6.7 dBmV 42.4 dB 607729425 0 0
22 Locked QAM256 21 621000000 Hz 7.0 dBmV 42.9 dB 607733089 0 0
23 Locked QAM256 22 627000000 Hz 7.2 dBmV 42.6 dB 607730719 0 0
24 Locked QAM256 23 633000000 Hz 7.0 dBmV 42.8 dB 607732118 0 0
25 Locked QAM256 24 639000000 Hz 6.9 dBmV 43.1 dB 607733007 0 0
26 Locked QAM256 26 645000000 Hz 7.1 dBmV 42.7 dB 607713484 0 0
27 Locked QAM256 27 651000000 Hz 7.2 dBmV 42.9 dB 607717228 0 0
28 Locked QAM256 28 657000000 Hz 7.4 dBmV 43.0 dB 607720665 0 0
29 Locked QAM256 29 663000000 Hz 7.2 dBmV 43.0 dB 607722399 0 0
30 Locked QAM256 30 669000000 Hz 7.0 dBmV 42.5 dB 607726933 0 0
31 Locked QAM256 32 681000000 Hz 7.2 dBmV 42.7 dB 607729263 0 0
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power
1 Locked ATDMA 1 36500000 Hz 41.5 dBmV
2 Locked ATDMA 2 30100000 Hz 41.5 dBmV
3 Locked ATDMA 3 23700000 Hz 41.5 dBmV
4 Locked ATDMA 4 17300000 Hz 41.3 dBmV
5 Not Locked Unknown 0 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Hz 0.0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>
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, 255 25 693000000 Hz 7.4 dBmV 36.8 dB 1108 ~ 2987 1228322069 1195836124 0
2 Not Locked 0, 255 0 0 Hz 9.6 dBmV 0.0 dB 0 ~ 4095 0 0 0

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked Unknown 0 0 Hz 0 dBmV
2 Not Locked Unknown 0 0 Hz 0 dBmV
New Poster

Re: CM1100-100NAS with 1gbps only getting 500ish on xfinitly speedtest.

Sorry forgot to add the error logs.

Time Priority Description
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=14:59:c0:f3:d2:80;CMTS-MAC=00:01:5c:81:ea:66;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=14:59:c0:f3:d2:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2019-05-05, 06:24:35 Critical (3) Resetting the cable modem due to docsDevResetNow
Official Employee

Re: CM1100-100NAS with 1gbps only getting 500ish on xfinitly speedtest.

connect_issue, thank you for reaching out to us here on the forums! I'm sorry to hear about the connectivity and speed issues you're running into, and I understand how important it is to have reliable service. I'd be happy to help! Can you please send me a PM with your first and last name? 

To send me a Private Message, please click my name “ComcastAlly” and click “send a message.”


I am an Official Comcast Employee.
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Regular Contributor

Re: CM1100-100NAS with 1gbps only getting 500ish on xfinitly speedtest.

@connect_issue Hi, what is the Firmware Version of your CM1100 and when did you take delivery?  V2.01.02 is the latest FW version as of 5/1/2019 according to Netgear.  I only received mine 10 days ago and seems to work okay.  I went from a CM600 on the 400/10 plan over the prior year which consistently got 440/12 speeds, to now well over 900/38 with the CM1100 on the 1Gig Tier.  However, their are only 2 users in the home and everyhing is hardwired connected by Cat6 Ethernet via an ASUS 1G router with it's Wifi disabled.  I think the maximun theoretically highest using the 1Gig Tier (w/o 2nd Port Aggregation) over hard wired Cat6 Ethernet is 940 according to the Xfinity 1Gig Troubleshooting Link below (due to Ethernet hardware limitations). However, I've seen as high as 975/40 in the middle of the night ocassionally at most all of the different testing sites.  Hope you're soon back out on the track and up to top gear speed:

 

https://forums.xfinity.com/t5/Your-Home-Network/Troubleshooting-Gigabit-internet-speeds/td-p/3145413

 

https://www.xfinity.com/support/articles/requirements-to-run-xfinity-internet-service