CM2000 modem unstable internet

Question

Optimum has told me to contact netgear support about my modem. They claim that there is no issue on their end for my internet. But at night and some times randomly during the day my connection becomes very unstable. Which causes horrible ping issues in games and issues streaming. My download speed ends up ranging from 10mbs to 120mbs(I pay for 200). I have my doubts it's the modem, but since I was told to ask here I am.

Cable Connection

Cancel Apply

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

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	573000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	14	573000000 Hz	3.3 dBmV	41.2 dB	0	0
2	Locked	QAM256	1	489000000 Hz	3.3 dBmV	41.4 dB	0	0
3	Locked	QAM256	2	495000000 Hz	3.2 dBmV	41.4 dB	0	0
4	Locked	QAM256	3	507000000 Hz	3.1 dBmV	41.3 dB	0	0
5	Locked	QAM256	4	513000000 Hz	2.9 dBmV	41.1 dB	0	0
6	Locked	QAM256	5	519000000 Hz	2.7 dBmV	41.1 dB	0	0
7	Locked	QAM256	6	525000000 Hz	3.1 dBmV	41.3 dB	0	0
8	Locked	QAM256	7	531000000 Hz	3.2 dBmV	41.3 dB	0	0
9	Locked	QAM256	8	537000000 Hz	2.8 dBmV	41.2 dB	0	0
10	Locked	QAM256	9	543000000 Hz	2.9 dBmV	41.1 dB	0	0
11	Locked	QAM256	10	549000000 Hz	3.1 dBmV	41.1 dB	0	0
12	Locked	QAM256	11	555000000 Hz	3.0 dBmV	41.2 dB	0	0
13	Locked	QAM256	12	561000000 Hz	3.4 dBmV	41.3 dB	0	0
14	Locked	QAM256	13	567000000 Hz	3.6 dBmV	41.3 dB	0	0
15	Locked	QAM256	15	579000000 Hz	3.1 dBmV	41.1 dB	0	0
16	Locked	QAM256	16	585000000 Hz	3.4 dBmV	41.2 dB	0	0
17	Locked	QAM256	17	591000000 Hz	3.6 dBmV	41.3 dB	0	0
18	Locked	QAM256	18	597000000 Hz	3.4 dBmV	41.3 dB	0	0
19	Locked	QAM256	19	603000000 Hz	3.4 dBmV	41.2 dB	0	0
20	Locked	QAM256	20	609000000 Hz	3.3 dBmV	41.1 dB	0	0
21	Locked	QAM256	21	615000000 Hz	3.2 dBmV	41.0 dB	0	0
22	Locked	QAM256	22	621000000 Hz	3.7 dBmV	41.1 dB	0	0
23	Locked	QAM256	23	627000000 Hz	3.8 dBmV	41.1 dB	0	0
24	Locked	QAM256	24	633000000 Hz	3.6 dBmV	41.1 dB	0	0
25	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
26	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
27	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
28	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
29	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
30	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
31	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 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	30800000 Hz	43.8 dBmV
2	Locked	ATDMA	2	5120	37500000 Hz	45.3 dBmV
3	Locked	ATDMA	3	5120	24100000 Hz	42.8 dBmV
4	Locked	ATDMA	4	5120	17500000 Hz	43.3 dBmV
5	Not Locked	Unknown	0	0	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0	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 ,2 ,3	159	717000000 Hz	5.0 dBmV	41.5 dB	1108 ~ 2987	326116794	123366860	50
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

This is what my cable modem shows for my connection. I don't think any thing is out of range, but I could be wrong.

Any help would be greater apricated.

plemans · Answer

A couple things.&nbsp;
1. the cable connections page only shows what's going on when you load the page. so next time you're having the issue, reload the page. that'll show us the power levels while the issue is going on.&nbsp;
2. the modem event log lets us look at issues longer term. A screen snip of that can help.&nbsp;
3. what makes you think its the modem? have you hardwired a computer to the modem and ran it during the period you usually have issues to test it?&nbsp;
4. what router is it connected to? Is it connected to a router with a 2.5g port? if so, try connecting it to the 1gig port on the router and use it. I've seen some routers that had issues with their 2.5gig ports.&nbsp;

Bloopbleep · Answer

To answer 3: I don't think it's the modem. I've had this issue before this modem, I bought this one to try and fix the issue, which it didn't. Saddly this issue ranges on how annoying it is so I let it slide most days. Today it's been very bad, so I called and they said everything seemed fine and to contact netgear support before sending out a tech to check in person.

4: Netgear XR500, I don't see any difference between the ethernet ports.

The event log:

Event Log

Clear Log Refresh

Time	Priority	Description
Fri Jun 03 16:59:33 2022	(Warning (5))	Dynamic Range Window violation
Fri Jun 03 16:59:33 2022	(Warning (5))	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Fri Jun 03 16:59:30 2022	(Warning (5))	REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Fri Jun 03 16:59:27 2022	(Notice (6))	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	(Warning (5))	ToD request sent - No Response received;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	(Warning (5))	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	(Notice (6))	Honoring MDD; IP provisioning mode = IPv4
Time Not Established	(Critical (3))	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu May 26 08:33:04 2022	(Notice (6))	CM-STATUS message sent. Event Type Code: 24; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Thu May 26 08:32:32 2022	(Notice (6))	CM-STATUS message sent. Event Type Code: 16; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Wed May 25 15:24:19 2022	(Critical (3))	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Wed May 25 13:09:21 2022	(Error (4))	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Wed May 25 12:21:56 2022	(Critical (3))	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Tue May 24 11:45:47 2022	(Error (4))	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 11:25:51 2022	(Warning (5))	Dynamic Range Window violation
Sun May 22 11:25:51 2022	(Warning (5))	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 11:25:50 2022	(Warning (5))	Dynamic Range Window violation
Sun May 22 11:25:50 2022	(Warning (5))	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 11:25:50 2022	(Warning (5))	REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 11:25:47 2022	(Notice (6))	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 11:25:39 2022	(Warning (5))	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	(Notice (6))	Honoring MDD; IP provisioning mode = IPv4
Time Not Established	(Critical (3))	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:43 2022	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:43 2022	(Warning (5))	Dynamic Range Window violation
Sun May 22 08:47:43 2022	(Warning (5))	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:43 2022	(Warning (5))	Dynamic Range Window violation
Sun May 22 08:47:43 2022	(Warning (5))	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:42 2022	(Warning (5))	REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:39 2022	(Notice (6))	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:38 2022	(Warning (5))	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:35 2022	(Critical (3))	DHCP FAILED - Request sent, No response;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:25 2022	(Notice (6))	Honoring MDD; IP provisioning mode = IPv4
Sun May 22 08:47:13 2022	(Critical (3))	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:11 2022	(Notice (6))	CM-STATUS message sent. Event Type Code: 24; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:47:07 2022	(Critical (3))	No Ranging Response received - T3 time-out;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:46:59 2022	(Critical (3))	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:46:51 2022	(Notice (6))	CM-STATUS message sent. Event Type Code: 24; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:46:19 2022	(Notice (6))	CM-STATUS message sent. Event Type Code: 16; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;
Sun May 22 08:45:12 2022	(Critical (3))	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;

plemans · Answer

You do have line notices/errors but they're not daily. And you have power violations. those usually mean the power has went out of spec and could be causing issues (dynamic range window violation)
does it happen every day?&nbsp;
When it happens, write down the times and compare them to the logs or post them back here with the times it happens and the logs.&nbsp;
&nbsp;

Bloopbleep · Answer

Internet is being horrible again today, there were more errors from earlier and from yesterday. I hit clear instead of refresh earlier in the day.&nbsp;Cable ConnectionCancel&nbsp;ApplyFrequency start ValueThis 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&nbsp;Startup ProcedureProcedureStatusCommentAcquire Downstream Channel573000000 HzLockedConnectivity StateOKOperationalBoot StateOKOperationalSecurityEnabledBPI+&nbsp;Downstream Bonded ChannelsChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables1LockedQAM25614573000000 Hz3.3 dBmV41.2 dB002LockedQAM2561489000000 Hz3.3 dBmV41.4 dB003LockedQAM2562495000000 Hz3.2 dBmV41.4 dB004LockedQAM2563507000000 Hz3.1 dBmV41.3 dB005LockedQAM2564513000000 Hz2.9 dBmV41.1 dB006LockedQAM2565519000000 Hz2.8 dBmV41.1 dB007LockedQAM2566525000000 Hz3.2 dBmV41.3 dB008LockedQAM2567531000000 Hz3.3 dBmV41.3 dB009LockedQAM2568537000000 Hz2.9 dBmV41.1 dB0010LockedQAM2569543000000 Hz3.0 dBmV41.1 dB0011LockedQAM25610549000000 Hz3.3 dBmV41.1 dB0012LockedQAM25611555000000 Hz3.1 dBmV41.2 dB0013LockedQAM25612561000000 Hz3.2 dBmV41.3 dB0014LockedQAM25613567000000 Hz3.5 dBmV41.3 dB0015LockedQAM25615579000000 Hz3.2 dBmV41.1 dB0016LockedQAM25616585000000 Hz3.5 dBmV41.2 dB0017LockedQAM25617591000000 Hz3.7 dBmV41.4 dB1018LockedQAM25618597000000 Hz3.6 dBmV41.3 dB0019LockedQAM25619603000000 Hz3.7 dBmV41.3 dB0020LockedQAM25620609000000 Hz3.4 dBmV41.1 dB0021LockedQAM25621615000000 Hz3.0 dBmV40.9 dB0022LockedQAM25622621000000 Hz3.5 dBmV41.0 dB0023LockedQAM25623627000000 Hz3.8 dBmV41.1 dB0024LockedQAM25624633000000 Hz3.6 dBmV41.1 dB0025Not LockedUnknown00 Hz0.0 dBmV0.0 dB0026Not LockedUnknown00 Hz0.0 dBmV0.0 dB0027Not LockedUnknown00 Hz0.0 dBmV0.0 dB0028Not LockedUnknown00 Hz0.0 dBmV0.0 dB0029Not LockedUnknown00 Hz0.0 dBmV0.0 dB0030Not LockedUnknown00 Hz0.0 dBmV0.0 dB0031Not LockedUnknown00 Hz0.0 dBmV0.0 dB0032Not LockedUnknown00 Hz0.0 dBmV0.0 dB00&nbsp;Upstream Bonded ChannelsChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower1LockedATDMA1512030800000 Hz43.8 dBmV2LockedATDMA2512037500000 Hz45.3 dBmV3LockedATDMA3512024100000 Hz43.3 dBmV4LockedATDMA4512017500000 Hz43.3 dBmV5Not LockedUnknown000 Hz0.0 dBmV6Not LockedUnknown000 Hz0.0 dBmV7Not LockedUnknown000 Hz0.0 dBmV8Not LockedUnknown000 Hz0.0 dBmV&nbsp;Downstream OFDM ChannelsChannelLockStatusModulation /Profile IDChannelIDFrequencyPowerSNR /MERActive SubcarrierNumber RangeUnerroredCodewordsCorrectableCodewordsUncorrectableCodewords1Locked0 ,1 ,2 ,3159717000000 Hz5.3 dBmV41.4 dB1108 ~ 298712226530259429533181027752Not Locked000 Hz0 dBmV0.0 dB0 ~ 4095000&nbsp;Upstream OFDMA ChannelsChannelLock StatusModulation / Profile IDChannel IDFrequencyPower1Not Locked000 Hz0 dBmV2Not Locked000 Hz0 dBmV&nbsp;Event LogClear Log&nbsp;Refresh&nbsp;TimePriorityDescriptionMon Jun 06 16:36:27 2022(Error (4))DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=94:a6:7e:fa:30:bc;CMTS-MAC=b0:90:7e:0f:de:b2;CM-QOS=1.1;CM-VER=3.1;

Forum Discussion

CM2000 modem unstable internet

4 Replies