CM1000V2 terrible upload/download latencies, HUGE SPIKES HUGE HEADACHES.

jaydubzok · ‎2023-03-17

PLEASE HELP, BEEN DEALING WITH THESE ISSUES FOR AWHILE, TOTAL HEADACHE.
Been having horrid spikes under load esp with upload when it's spiking well over 100ms and online gaming is **bleep**ing terrible experience too... here's my logs. Spectrum said nothing wrong with their end.

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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	297000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enable	BPI+
IP Provisioning Mode	Honor MDD	IPv4 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	1	297000000 Hz	7.7 dBmV	43.5 dB	681408236	0	0
2	Locked	QAM256	2	303000000 Hz	7.4 dBmV	43.0 dB	681397419	0	0
3	Locked	QAM256	3	309000000 Hz	7.5 dBmV	43.4 dB	681414499	0	0
4	Locked	QAM256	4	315000000 Hz	7.1 dBmV	43.0 dB	681418029	0	0
5	Locked	QAM256	5	321000000 Hz	6.9 dBmV	43.2 dB	681422171	0	0
6	Locked	QAM256	6	327000000 Hz	6.9 dBmV	42.9 dB	681426500	0	0
7	Locked	QAM256	7	333000000 Hz	6.9 dBmV	43.0 dB	681429962	0	0
8	Locked	QAM256	8	339000000 Hz	6.9 dBmV	43.3 dB	681434569	0	0
9	Locked	QAM256	9	345000000 Hz	6.9 dBmV	43.1 dB	681438145	0	0
10	Locked	QAM256	10	351000000 Hz	6.8 dBmV	43.1 dB	681440480	0	0
11	Locked	QAM256	11	357000000 Hz	6.7 dBmV	42.9 dB	681445200	0	0
12	Locked	QAM256	12	363000000 Hz	6.8 dBmV	43.0 dB	681449332	0	0
13	Locked	QAM256	13	369000000 Hz	6.6 dBmV	42.8 dB	681451899	0	0
14	Locked	QAM256	14	375000000 Hz	6.3 dBmV	42.9 dB	681455466	0	0
15	Locked	QAM256	15	381000000 Hz	6.2 dBmV	42.6 dB	681459287	0	0
16	Locked	QAM256	16	387000000 Hz	6.5 dBmV	43.2 dB	681461804	0	0
17	Locked	QAM256	17	393000000 Hz	6.7 dBmV	42.9 dB	681466569	0	0
18	Locked	QAM256	18	399000000 Hz	6.8 dBmV	43.1 dB	681469933	0	0
19	Locked	QAM256	19	405000000 Hz	7.4 dBmV	43.2 dB	681475735	0	0
20	Locked	QAM256	20	411000000 Hz	7.6 dBmV	43.3 dB	681478590	0	0
21	Locked	QAM256	21	423000000 Hz	7.5 dBmV	43.1 dB	681483241	0	0
22	Locked	QAM256	22	429000000 Hz	7.2 dBmV	42.7 dB	681486161	0	0
23	Locked	QAM256	23	435000000 Hz	6.8 dBmV	43.0 dB	681489347	0	0
24	Locked	QAM256	24	447000000 Hz	6.4 dBmV	42.9 dB	681493927	0	0
25	Locked	QAM256	25	453000000 Hz	6.5 dBmV	43.1 dB	681496843	0	0
26	Locked	QAM256	26	459000000 Hz	6.6 dBmV	43.1 dB	681501872	0	0
27	Locked	QAM256	27	465000000 Hz	6.9 dBmV	43.3 dB	681504807	0	0
28	Locked	QAM256	28	471000000 Hz	7.1 dBmV	43.3 dB	681509584	0	0
29	Locked	QAM256	29	477000000 Hz	7.1 dBmV	43.3 dB	681512633	0	0
30	Locked	QAM256	30	483000000 Hz	7.1 dBmV	43.2 dB	681516850	0	0
31	Locked	QAM256	31	489000000 Hz	7.1 dBmV	43.3 dB	681519541	0	0
32	Locked	QAM256	32	495000000 Hz	7.0 dBmV	43.3 dB	681518471	0	0

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

Channel	Lock Status	Modulation	Channel ID	Frequency	Power
1	Locked	ATDMA	2	24000000 Hz	38.3 dBmV
2	Locked	ATDMA	3	30400000 Hz	39.0 dBmV
3	Locked	ATDMA	4	36800000 Hz	39.3 dBmV
4	Not Locked	Unknown	0	0 Hz	0.0 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, 1, 2	33	617000000 Hz	5.2 dBmV	40.5 dB	1108 ~ 2987	339942549	288934966	0
2	Not Locked	0	0	0 Hz	6.6 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	Locked	3, 4, 11, 12, 13	9	5850000 Hz	35.5 dBmV
2	Not Locked	3, 4, 11, 12, 13	0	0 Hz	0.0 dBmV

jaydubzok · ‎2023-08-18

Thanks for your quick reply, here's the logs below. Is it the correctables on the downstream that should be 0? Been back and forth with my ISP with no resolution for awhile, new rg6 cables, etc.

Using CAT 8, using a Netduma R2 for a router, I can test here in a bit doing a direct connection.

Time	Priority	Description
2023-08-18, 21:41:07	Warning (5)	DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 21:41:07	Notice (6)	US profile assignment change. US Chan ID: 8; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 21:27:56	Warning (5)	REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 21:27:56	Notice (6)	US profile assignment change. US Chan ID: 8; Previous Profile: 13; New Profile: 11 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 21:27:52	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 21:27:48	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 21:27:48	Error (4)	Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 21:27:48	Error (4)	Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 21:27:48	Warning (5)	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=;CMTS-MAC=;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=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 19:07:56	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 19:07:45	Critical (3)	REG RSP not received;CM-MAC=;CMTS-MAC=;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=;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2023-08-18, 09:33:11	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:57	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:57	Critical (3)	Ranging Request Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:47	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:45	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:45	Critical (3)	Ranging Request Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:39	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:37	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:37	Critical (3)	Ranging Request Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:31	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:31	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:31	Critical (3)	Ranging Request Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:23	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:22	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:22	Critical (3)	Ranging Request Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:15	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:13	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:13	Critical (3)	Ranging Request Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:05	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:03	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:30:03	Critical (3)	Ranging Request Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:29:53	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:29:53	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:29:53	Critical (3)	Ranging Request Retries exhausted;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:29:43	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;
2023-08-17, 19:29:41	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1;

FURRYe38 · ‎2023-08-19

Yes.

Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the 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.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/

FURRYe38 · ‎2024-03-05

Any progress on this?

@jaydubzok wrote:

PLEASE HELP, BEEN DEALING WITH THESE ISSUES FOR AWHILE, TOTAL HEADACHE.
Been having horrid spikes under load esp with upload when it's spiking well over 100ms and online gaming is terrible experience too... here's my logs. Spectrum said nothing wrong with their end.

jaydubzok · ‎2024-03-29

Delete this post, please

FURRYe38 · ‎2024-03-29

Were you able to get this resolved?

CM1000V2 terrible upload/download latencies, HUGE SPIKES HUGE HEADACHES.

CM1000V2 terrible upload/download latencies, HUGE SPIKES HUGE HEADACHES.

Re: Need help with CM1000v2, packet loss + high latency with spectrum ISP

Re: Need help with CM1000v2, packet loss + high latency with spectrum ISP

Re: CM1000V2 terrible upload/download latencies, HUGE SPIKES HUGE HEADACHES.

Re: CM1000V2 terrible upload/download latencies, HUGE SPIKES HUGE HEADACHES.

Re: CM1000V2 terrible upload/download latencies, HUGE SPIKES HUGE HEADACHES.