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CM1000v2 modem is extremely slow and nowhere near the speeds of my CM500.

Wishengrad
Tutor

CM1000v2 modem is extremely slow and nowhere near the speeds of my CM500.

Hi all. My ISP is Spectrum and they sent their own modem recently to replace my CM500 because it's going to be outdated soon. I wanted to stick with my own equipment so I had recently purchased a CM1000v2 modem and set it up to replace my CM500. My rated speeds that I pay for are 350 download and 30 upload. With my CM500, I would consistently get around 330-350 down and 25 up. I should add that I also connect through the Netgear R6400 (AC 1750) router as well with the latest stock firmware. I would get the same speeds regardless of being wired via ethernet to the router or modem. With the new CM1000v2, I get a maximum download of 70 and an upload of 5. It usually fluctuates around 50 down and 4.5 up. This still happens even if I run a speed test wired directly into the modem. Spectrum was no help and said they noticed no issues. My coax is fairly new and also has a PoE filter to reduce the noise. I don't believe the connection has a splitter as it goes into a box with the neighbors right outside my building. Speed tests show slow speeds on multiple desktops running Windows 10 as well as two Android phones. Below I will drop info from the modem page.

 

TL;DR, switching from CM500 to CM1000v2 dropped my download from 350 to about 50 and upload from 25 to about 5. I have tried hard resetting and Spectrum says it provisioned perfectly with no issues. I ran a speed test for my CM500 before I made the switch to compare and the lowered speeds were instantaneous after setting up the new modem. Help.

Hardware Version2.02
 
Firmware VersionV1.01.03

 

Starting Frequency

<tabindex=-1>Startup Procedure</tabindex=-1>

ProcedureStatusComment
Acquire Downstream Channel705000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv4 only

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

ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25631705000000 Hz-4.0 dBmV42.1 dB246759119800
2LockedQAM2561693000000 Hz-4.1 dBmV42.2 dB246679109700
3LockedQAM2562525000000 Hz-0.4 dBmV44.0 dB246679933700
4LockedQAM2563531000000 Hz-0.4 dBmV44.0 dB246680264900
5LockedQAM2564537000000 Hz-0.3 dBmV44.0 dB246680601500
6LockedQAM2565543000000 Hz-0.6 dBmV44.0 dB246680925600
7LockedQAM2566549000000 Hz-0.6 dBmV44.0 dB246681571000
8LockedQAM2567555000000 Hz-0.5 dBmV43.9 dB246681724800
9LockedQAM2568561000000 Hz-0.5 dBmV44.1 dB246682141400
10LockedQAM2569567000000 Hz-0.6 dBmV44.0 dB246684067800
11LockedQAM25610573000000 Hz-0.5 dBmV44.0 dB246684503000
12LockedQAM25611579000000 Hz-0.8 dBmV43.9 dB246684857800
13LockedQAM25612585000000 Hz-0.8 dBmV43.9 dB246685260200
14LockedQAM25613591000000 Hz-0.8 dBmV43.9 dB246685571400
15LockedQAM25614597000000 Hz-0.6 dBmV43.9 dB246685975500
16LockedQAM25615603000000 Hz-0.9 dBmV43.7 dB246686353400
17LockedQAM25616609000000 Hz-1.1 dBmV43.5 dB246686883600
18LockedQAM25617615000000 Hz-1.2 dBmV43.5 dB246687051900
19LockedQAM25618621000000 Hz-1.2 dBmV43.0 dB246687396500
20LockedQAM25619627000000 Hz-1.3 dBmV43.5 dB246687767100
21LockedQAM25620633000000 Hz-1.7 dBmV43.2 dB246688230200
22LockedQAM25621639000000 Hz-1.7 dBmV43.2 dB246688626100
23LockedQAM25622645000000 Hz-2.0 dBmV43.0 dB246689070400
24LockedQAM25624657000000 Hz-2.4 dBmV42.9 dB246689295300
25LockedQAM25625663000000 Hz-2.8 dBmV42.7 dB246689670400
26LockedQAM25626669000000 Hz-3.4 dBmV42.4 dB246689930600
27LockedQAM25627675000000 Hz-3.7 dBmV40.5 dB246690396300
28LockedQAM25628681000000 Hz-4.1 dBmV42.1 dB246690563600
29LockedQAM25629687000000 Hz-4.1 dBmV42.0 dB246690933400
30LockedQAM25630699000000 Hz-4.5 dBmV41.9 dB246691244000
31LockedQAM25632519000000 Hz-0.4 dBmV43.8 dB246691029400
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

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

ChannelLock StatusModulationChannel IDFrequencyPower
1Not LockedUnknown00 Hz0.0 dBmV
2LockedATDMA330600000 Hz47.3 dBmV
3LockedATDMA437000000 Hz47.0 dBmV
4Not LockedUnknown00 Hz0.0 dBmV
5Not LockedUnknown00 Hz0.0 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, 233380000000 Hz-0.5 dBmV43.0 dB1108 ~ 298796609713946483751940
2Not Locked000 Hz-2.6 dBmV0.0 dB0 ~ 4095000

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

ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Locked3, 4, 11, 12, 1316025000 Hz45.5 dBmV
2Not Locked3, 4, 11, 12, 1300 Hz0.0 dBmV
TimePriorityDescription
2022-05-20, 00:13:58Notice (6)US profile assignment change. US Chan ID: 8; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-20, 00:03:55Notice (6)US profile assignment change. US Chan ID: 8; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-19, 23:22:14Notice (6)US profile assignment change. US Chan ID: 8; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-19, 23:12:11Notice (6)US profile assignment change. US Chan ID: 8; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-19, 18:39:13Notice (6)US profile assignment change. US Chan ID: 8; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-19, 18:29:10Notice (6)US profile assignment change. US Chan ID: 8; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-19, 15:47:13Notice (6)US profile assignment change. US Chan ID: 8; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-19, 15:37:10Notice (6)US profile assignment change. US Chan ID: 8; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-19, 13:37:04Notice (6)DHCP Renew - lease parameters Time Protocol Servers modified;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-19, 13:37:04Error (4)DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
Message 1 of 6

Accepted Solutions
Wishengrad
Tutor

Re: CM1000v2 modem is extremely slow and nowhere near the speeds of my CM500.

The head engineer at Spectrum had to look into my issue. They said it was something they haven't seen before and had to go into the backend and forcefully manipulate everything since their service wasn't talking to my modem properly despite being properly provisioned. I am now getting my speeds with the modem and it seems to be working fine.

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Message 5 of 6

All Replies
Wishengrad
Tutor

Re: CM1000v2 modem is extremely slow and nowhere near the speeds of my CM500.

I rebooted my modem and connected my router. This is the log from doing that:

 

TimePriorityDescription
2022-05-21, 15:31:39Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-21, 15:25:23Notice (6)US profile assignment change. US Chan ID: 8; Previous Profile: 13; New Profile: 11 13.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-21, 15:25:16Notice (6)DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2.;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-21, 15:25:11Notice (6)TLV-11 - unrecognized OID;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-21, 15:25:11Error (4)Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-21, 15:25:11Error (4)Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
2022-05-21, 15:25:11Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC=9c:c9:eb:40:49:78;CMTS-MAC=00:01:5c:69:b0:6f;CM-QOS=1.1;CM-VER=3.1;
Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv4
Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:40:49:78;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=9c:c9:eb:40:49:78;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

 

Message 2 of 6
FURRYe38
Guru

Re: CM1000v2 modem is extremely slow and nowhere near the speeds of my CM500.

Check the speeds at the modem with out the NG router connected.

 

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 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?article=24311
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CBR750 Modem | Wifi Router CBR750(v.7) | Switches NG GS105/8 and XS505M | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

Message 3 of 6
Wishengrad
Tutor

Re: CM1000v2 modem is extremely slow and nowhere near the speeds of my CM500.

Hi FURRYe38,

 

Everything in your comment is already mentioned as troubleshooting steps I have done in the original post.

 

Message 4 of 6
Wishengrad
Tutor

Re: CM1000v2 modem is extremely slow and nowhere near the speeds of my CM500.

The head engineer at Spectrum had to look into my issue. They said it was something they haven't seen before and had to go into the backend and forcefully manipulate everything since their service wasn't talking to my modem properly despite being properly provisioned. I am now getting my speeds with the modem and it seems to be working fine.

Message 5 of 6
FURRYe38
Guru

Re: CM1000v2 modem is extremely slow and nowhere near the speeds of my CM500.

Glad they got it working. 

Enjoy. 

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CBR750 Modem | Wifi Router CBR750(v.7) | Switches NG GS105/8 and XS505M | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

Message 6 of 6
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