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.

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 V7.01.01The connection says GoodFrequency 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>ProcedureStatusCommentAcquire Downstream Channel651000000 HzLockedConnectivity StateOKOperationalBoot StateOKOperationalSecurityEnableBPI+IP Provisioning ModeHonor MDDIPv6 only<tabindex=-1>Downstream Bonded Channels</tabindex=-1>ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords1LockedQAM25637651000000 Hz3.5 dBmV39.7 dB35383176002LockedQAM25610483000000 Hz4.4 dBmV41.6 dB34227231003LockedQAM25611489000000 Hz4.6 dBmV41.6 dB34230641004LockedQAM25612495000000 Hz4.7 dBmV41.6 dB34234480005LockedQAM25613507000000 Hz5.6 dBmV41.8 dB34238224006LockedQAM25614513000000 Hz6.0 dBmV41.8 dB34242485007LockedQAM25615519000000 Hz6.6 dBmV42.0 dB34245954008LockedQAM25616525000000 Hz7.0 dBmV41.9 dB34249929009LockedQAM25617531000000 Hz7.5 dBmV42.0 dB342535200010LockedQAM25618537000000 Hz8.1 dBmV41.9 dB342573800011LockedQAM25619543000000 Hz8.4 dBmV41.9 dB342601390012LockedQAM25620549000000 Hz8.6 dBmV42.0 dB342647240013LockedQAM25621555000000 Hz8.3 dBmV41.6 dB342688380014LockedQAM25622561000000 Hz7.7 dBmV41.6 dB342723100015LockedQAM25623567000000 Hz7.0 dBmV41.5 dB342756330016LockedQAM25624573000000 Hz6.3 dBmV41.5 dB342793220017LockedQAM25625579000000 Hz5.8 dBmV41.5 dB342864350018LockedQAM25626585000000 Hz5.2 dBmV41.2 dB342899710019LockedQAM25627591000000 Hz4.8 dBmV41.2 dB342936160020LockedQAM25628597000000 Hz4.5 dBmV41.2 dB342973750021LockedQAM25629603000000 Hz4.3 dBmV40.8 dB343010460022LockedQAM25630609000000 Hz3.9 dBmV40.7 dB343049450023LockedQAM25631615000000 Hz3.7 dBmV40.5 dB343087350024LockedQAM25632621000000 Hz3.8 dBmV40.6 dB343120950025LockedQAM25633627000000 Hz3.8 dBmV40.5 dB343160980026LockedQAM25634633000000 Hz3.8 dBmV40.3 dB343199350027LockedQAM25635639000000 Hz3.6 dBmV39.9 dB343235900028LockedQAM25636645000000 Hz3.4 dBmV39.8 dB343269940029LockedQAM25638657000000 Hz3.6 dBmV39.9 dB343308520030LockedQAM25639663000000 Hz3.8 dBmV40.1 dB343320780031LockedQAM25640669000000 Hz3.7 dBmV40.3 dB343329130032Not LockedUnknown00 Hz0.0 dBmV0.0 dB000<tabindex=-1>Upstream Bonded Channels</tabindex=-1>ChannelLock StatusModulationChannel IDFrequencyPower1LockedATDMA135600000 Hz43.0 dBmV2LockedATDMA229200000 Hz43.0 dBmV3LockedATDMA322800000 Hz42.3 dBmV4LockedATDMA416400000 Hz40.8 dBmV5LockedATDMA940400000 Hz41.3 dBmV6Not LockedUnknown00 Hz0.0 dBmV7Not LockedUnknown00 Hz0.0 dBmV8Not LockedUnknown00 Hz0.0 dBmV<tabindex=-1>Downstream OFDM Channels</tabindex=-1>ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords1Locked0, 1, 2, 341722000000 Hz4.5 dBmV39.3 dB1228 ~ 28678573472292853202Not Locked000 Hz4.8 dBmV0.0 dB0 ~ 4095000<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower1Not LockedUnknown00 Hz0 dBmV2Not LockedUnknown00 Hz0 dBmVCurrent System Time: Sun Oct 18 20:23:53 2020 System Up Time: 0:13:19 The event logs have the following issuesTimePriorityDescription2020-10-18, 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 = IPv6Time 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.

I tested directly hardwired through a laptop to my modem.

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

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 !

CM1000 not getting Gigabit speed with Xfinity

11 Replies

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

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>

Procedure	Status	Comment
Acquire Downstream Channel	651000000 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	37	651000000 Hz	3.5 dBmV	39.7 dB	35383176	0	0
2	Locked	QAM256	10	483000000 Hz	4.4 dBmV	41.6 dB	34227231	0	0
3	Locked	QAM256	11	489000000 Hz	4.6 dBmV	41.6 dB	34230641	0	0
4	Locked	QAM256	12	495000000 Hz	4.7 dBmV	41.6 dB	34234480	0	0
5	Locked	QAM256	13	507000000 Hz	5.6 dBmV	41.8 dB	34238224	0	0
6	Locked	QAM256	14	513000000 Hz	6.0 dBmV	41.8 dB	34242485	0	0
7	Locked	QAM256	15	519000000 Hz	6.6 dBmV	42.0 dB	34245954	0	0
8	Locked	QAM256	16	525000000 Hz	7.0 dBmV	41.9 dB	34249929	0	0
9	Locked	QAM256	17	531000000 Hz	7.5 dBmV	42.0 dB	34253520	0	0
10	Locked	QAM256	18	537000000 Hz	8.1 dBmV	41.9 dB	34257380	0	0
11	Locked	QAM256	19	543000000 Hz	8.4 dBmV	41.9 dB	34260139	0	0
12	Locked	QAM256	20	549000000 Hz	8.6 dBmV	42.0 dB	34264724	0	0
13	Locked	QAM256	21	555000000 Hz	8.3 dBmV	41.6 dB	34268838	0	0
14	Locked	QAM256	22	561000000 Hz	7.7 dBmV	41.6 dB	34272310	0	0
15	Locked	QAM256	23	567000000 Hz	7.0 dBmV	41.5 dB	34275633	0	0
16	Locked	QAM256	24	573000000 Hz	6.3 dBmV	41.5 dB	34279322	0	0
17	Locked	QAM256	25	579000000 Hz	5.8 dBmV	41.5 dB	34286435	0	0
18	Locked	QAM256	26	585000000 Hz	5.2 dBmV	41.2 dB	34289971	0	0
19	Locked	QAM256	27	591000000 Hz	4.8 dBmV	41.2 dB	34293616	0	0
20	Locked	QAM256	28	597000000 Hz	4.5 dBmV	41.2 dB	34297375	0	0
21	Locked	QAM256	29	603000000 Hz	4.3 dBmV	40.8 dB	34301046	0	0
22	Locked	QAM256	30	609000000 Hz	3.9 dBmV	40.7 dB	34304945	0	0
23	Locked	QAM256	31	615000000 Hz	3.7 dBmV	40.5 dB	34308735	0	0
24	Locked	QAM256	32	621000000 Hz	3.8 dBmV	40.6 dB	34312095	0	0
25	Locked	QAM256	33	627000000 Hz	3.8 dBmV	40.5 dB	34316098	0	0
26	Locked	QAM256	34	633000000 Hz	3.8 dBmV	40.3 dB	34319935	0	0
27	Locked	QAM256	35	639000000 Hz	3.6 dBmV	39.9 dB	34323590	0	0
28	Locked	QAM256	36	645000000 Hz	3.4 dBmV	39.8 dB	34326994	0	0
29	Locked	QAM256	38	657000000 Hz	3.6 dBmV	39.9 dB	34330852	0	0
30	Locked	QAM256	39	663000000 Hz	3.8 dBmV	40.1 dB	34332078	0	0
31	Locked	QAM256	40	669000000 Hz	3.7 dBmV	40.3 dB	34332913	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	35600000 Hz	43.0 dBmV
2	Locked	ATDMA	2	29200000 Hz	43.0 dBmV
3	Locked	ATDMA	3	22800000 Hz	42.3 dBmV
4	Locked	ATDMA	4	16400000 Hz	40.8 dBmV
5	Locked	ATDMA	9	40400000 Hz	41.3 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, 1, 2, 3	41	722000000 Hz	4.5 dBmV	39.3 dB	1228 ~ 2867	8573472	2928532	0
2	Not Locked	0	0	0 Hz	4.8 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

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

The event logs have the following issues

Time	Priority	Description
2020-10-18, 20:11:17	Notice (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 Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Time Not Established	Critical (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 Established	Critical (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 Established	Critical (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 Established	Critical (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 Established	Critical (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
Aspirant
Oct 19, 2020
I tested directly hardwired through a laptop to my modem.

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CM1000 not getting Gigabit speed with Xfinity