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RandomName1's avatar
RandomName1
Follower
Oct 10, 2020

CM1000 not getting Gigabit speed with Xfinity

The Xfinity tech showed upwards of 1 Gig from the wall but I can't get a gig connected directly to the CM1000 modem. Please help.
plemans's avatar
plemans
Guru - Experienced User
Oct 10, 2020

What speed are you getting? 

What device are you testing on? 

What website are you using for test?  (if its speedtest.com, try several of their servers, they don't always pick one that can max out the speed). Try speedtest.xfinity.com

Gpai's avatar
Gpai
Aspirant
Oct 19, 2020

I am having similar issues. I recently upgraded to gig speed through comcast. The engineer came and tested with his equipment and he was getting gig speed whereas I was not able to through my CM1000.

The version of Firmware is V7.01.01

The connection says Good

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>

ProcedureStatusComment
Acquire Downstream Channel651000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv6 only

<tabindex=-1>Downstream Bonded Channels</tabindex=-1>

ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25637651000000 Hz3.5 dBmV39.7 dB3538317600
2LockedQAM25610483000000 Hz4.4 dBmV41.6 dB3422723100
3LockedQAM25611489000000 Hz4.6 dBmV41.6 dB3423064100
4LockedQAM25612495000000 Hz4.7 dBmV41.6 dB3423448000
5LockedQAM25613507000000 Hz5.6 dBmV41.8 dB3423822400
6LockedQAM25614513000000 Hz6.0 dBmV41.8 dB3424248500
7LockedQAM25615519000000 Hz6.6 dBmV42.0 dB3424595400
8LockedQAM25616525000000 Hz7.0 dBmV41.9 dB3424992900
9LockedQAM25617531000000 Hz7.5 dBmV42.0 dB3425352000
10LockedQAM25618537000000 Hz8.1 dBmV41.9 dB3425738000
11LockedQAM25619543000000 Hz8.4 dBmV41.9 dB3426013900
12LockedQAM25620549000000 Hz8.6 dBmV42.0 dB3426472400
13LockedQAM25621555000000 Hz8.3 dBmV41.6 dB3426883800
14LockedQAM25622561000000 Hz7.7 dBmV41.6 dB3427231000
15LockedQAM25623567000000 Hz7.0 dBmV41.5 dB3427563300
16LockedQAM25624573000000 Hz6.3 dBmV41.5 dB3427932200
17LockedQAM25625579000000 Hz5.8 dBmV41.5 dB3428643500
18LockedQAM25626585000000 Hz5.2 dBmV41.2 dB3428997100
19LockedQAM25627591000000 Hz4.8 dBmV41.2 dB3429361600
20LockedQAM25628597000000 Hz4.5 dBmV41.2 dB3429737500
21LockedQAM25629603000000 Hz4.3 dBmV40.8 dB3430104600
22LockedQAM25630609000000 Hz3.9 dBmV40.7 dB3430494500
23LockedQAM25631615000000 Hz3.7 dBmV40.5 dB3430873500
24LockedQAM25632621000000 Hz3.8 dBmV40.6 dB3431209500
25LockedQAM25633627000000 Hz3.8 dBmV40.5 dB3431609800
26LockedQAM25634633000000 Hz3.8 dBmV40.3 dB3431993500
27LockedQAM25635639000000 Hz3.6 dBmV39.9 dB3432359000
28LockedQAM25636645000000 Hz3.4 dBmV39.8 dB3432699400
29LockedQAM25638657000000 Hz3.6 dBmV39.9 dB3433085200
30LockedQAM25639663000000 Hz3.8 dBmV40.1 dB3433207800
31LockedQAM25640669000000 Hz3.7 dBmV40.3 dB3433291300
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>

ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA135600000 Hz43.0 dBmV
2LockedATDMA229200000 Hz43.0 dBmV
3LockedATDMA322800000 Hz42.3 dBmV
4LockedATDMA416400000 Hz40.8 dBmV
5LockedATDMA940400000 Hz41.3 dBmV
6Not LockedUnknown00 Hz0.0 dBmV
7Not LockedUnknown00 Hz0.0 dBmV
8Not LockedUnknown00 Hz0.0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>

ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1Locked0, 1, 2, 341722000000 Hz4.5 dBmV39.3 dB1228 ~ 2867857347229285320
2Not Locked000 Hz4.8 dBmV0.0 dB0 ~ 4095000

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>

ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not LockedUnknown00 Hz0 dBmV
2Not LockedUnknown00 Hz0 dBmV

Current System Time: Sun Oct 18 20:23:53 2020 System Up Time: 0:13:19

 

 

The event logs have the following issues

TimePriorityDescription
2020-10-18, 20:11:17Notice (6)DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=a0:04:60:fc:4f:50;CMTS-MAC=00:01:5c:b2:02:92;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv6
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=a0:04:60:fc:4f:50;CMTS-MAC=00:01:5c:b2:02:92;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=a0:04:60:fc:4f:50;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=a0:04:60:fc:4f:50;CMTS-MAC=00:01:5c:b2:02:92;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=a0:04:60:fc:4f:50;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedCritical (3)

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=a0:04:60:fc:4f:50;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

 

Can someone help explain what the issue is with me not getting Gig speeds. I max out at 230 to 250 mpbs.

 

Please HELP.

 

  • Gpai's avatar
    Gpai
    Aspirant
    Oct 19, 2020

    I tested directly hardwired through a laptop to my modem.

  • FURRYe38's avatar
    FURRYe38
    Guru - Experienced User
    Oct 19, 2020

    Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
    Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
    Be sure your using good quality RG6 coax cable up to the modem. 
    Be sure to power OFF the modem for 1 minute them back ON.

    Factory reset the modem as well. 
    https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853

    • Gpai's avatar
      Gpai
      Aspirant
      Oct 19, 2020

      Furrye38,

       

      The ISP provider in this case Comcast came home yesterday and checked the quality of the signal coming inside the home. The was able to remove some issues with some interference and was able to demonstrate through his equipment that the signal was strong and he was gettting more than 1 gig connection for download.

       

      And he connected the modem directly to the incoming RG6 Coax. While debugging by connecting my laptop directly to the modem ethernet out I also did the following

       

      (a) I rebooted the modem several times and tried the connection

      (b) Factory reset

      (c) Each time waited a few mins (powered off, removed the coax connection, removed power input)

       

      Both did not solve the issue.

       

      I had asked the ISP to reprovision the modem before the Tech came in yesterday and that was not successful either. The only thing I have not done is to as them to reprovision after the tech came to visit. I will try that today and repost and see if it that makes a difference.

       

      Would love for someone more knowledgeable than me to look at the settings I posted and logs and see if there is something they see glaring that I might be able to work with Comcast to fix.

       

      Thanks again to everyone who is helping me resolve this !

      • FURRYe38's avatar
        FURRYe38
        Guru - Experienced User
        Oct 19, 2020

        Seems like the ISP has checked everything. Seems like the the modem itself maybe the problem. I would get another modem put in place to see if the problem continutes...