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Re: CM1000 Upstream Light Keeps Turning Amber

EMH
Tutor
Tutor

CM1000 Upstream Light Keeps Turning Amber

Hello all, 

 

I've been trying for weeks to resolve an issue with a Netgear ADT Hub. ADT has been out several times to no avail. I've tried everything but can't seem to locate the problem. The only network component I haven't changed out is my Netgear CM1000 modem. I have noticed that there are periods of time when the upstream light is solid amber. Most of the time it is green, but I am wondering if this issue may be contributory. 

 

A quick glance at the manual suggests this indicates that only ONE upstream channel locked but indicates this is WNL. Could this be contibuting to my ADT Hub problem? If so, can anyone suggest a possible solution?

 

Thanks!

Message 1 of 11
FURRYe38
Guru

Re: CM1000 Upstream Light Keeps Turning Amber

Please post a copy and paste of the modems connection status page.
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...

Message 2 of 11
EMH
Tutor
Tutor

Re: CM1000 Upstream Light Keeps Turning Amber

 

@FURRYe38 - Thanks for the info. All measures have been taken.

 

Please post a copy and paste of the modems connection status page. <- done, upstream status light is green at the moment. 
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly. <- check
Be sure there are no coax cable line splitters in the between the modem and ISP service box. <- check
Be sure your using good quality RG6 coax cable up to the modem. <- check, including drop line.
Be sure to power OFF the modem for 1 minute then back ON. <- done for 3" at a time (more than once during troubleshooting). 

 

Could you explain the potential issues associated with only locking one upstrem channel? 


Cable Connection

ProcedureStatusComment
Acquire Downstream Channel429000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeHonor MDDIPv4 only

Downstream Bonded Channels 
ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1LockedQAM25645429000000 Hz5.9 dBmV42.5 dB37248356600
2LockedQAM2561783000000 Hz4.1 dBmV41.5 dB37151665100
3LockedQAM2562789000000 Hz3.7 dBmV41.3 dB37151962200
4LockedQAM2563795000000 Hz3.6 dBmV41.2 dB37152372000
5LockedQAM2565807000000 Hz3.4 dBmV40.9 dB37152775600
6LockedQAM25613855000000 Hz3.2 dBmV40.4 dB37153139300
7LockedQAM25615867000000 Hz2.6 dBmV40.3 dB37153519200
8LockedQAM25616873000000 Hz2.4 dBmV40.2 dB37153753800
9LockedQAM25617879000000 Hz1.9 dBmV40.0 dB37154193200
10LockedQAM25618885000000 Hz1.6 dBmV40.0 dB37154557700
11LockedQAM25619891000000 Hz1.9 dBmV40.0 dB37154921000
12LockedQAM25620897000000 Hz1.9 dBmV40.1 dB37155293900
13LockedQAM25621903000000 Hz1.8 dBmV40.0 dB37155687100
14LockedQAM25622909000000 Hz0.4 dBmV39.4 dB37156043500
15LockedQAM25623915000000 Hz0.2 dBmV39.2 dB37156425800
16LockedQAM25624921000000 Hz-0.5 dBmV38.9 dB37156794900
17LockedQAM25629951000000 Hz0.0 dBmV38.8 dB37157166800
18LockedQAM25633357000000 Hz4.3 dBmV41.5 dB37157500900
19LockedQAM25634363000000 Hz4.7 dBmV41.9 dB37157906000
20LockedQAM25635369000000 Hz4.7 dBmV42.0 dB37158309200
21LockedQAM25636375000000 Hz5.2 dBmV42.1 dB37158621600
22LockedQAM25637381000000 Hz5.2 dBmV42.1 dB37159038800
23LockedQAM25638387000000 Hz5.4 dBmV42.3 dB37159385200
24LockedQAM25639393000000 Hz5.3 dBmV42.3 dB37159757000
25LockedQAM25640399000000 Hz5.5 dBmV42.3 dB37160133600
26LockedQAM25641405000000 Hz5.4 dBmV42.3 dB37160491700
27LockedQAM25642411000000 Hz5.8 dBmV42.4 dB37160922700
28LockedQAM25643417000000 Hz5.6 dBmV42.4 dB37161273100
29LockedQAM25644423000000 Hz5.9 dBmV42.5 dB37161602900
30LockedQAM25646435000000 Hz6.2 dBmV42.6 dB37161966600
31LockedQAM25647441000000 Hz5.8 dBmV42.6 dB37162153700
32LockedQAM25648447000000 Hz5.9 dBmV42.7 dB37162134100

 Upstream Bonded Channels 
ChannelLock StatusModulationChannel IDFrequencyPower
1LockedATDMA119300000 Hz58.3 dBmV
2LockedATDMA225800000 Hz58.3 dBmV
3LockedATDMA332200000 Hz58.3 dBmV
4LockedATDMA438600000 Hz58.3 dBmV
5LockedATDMA614500000 Hz55.3 dBmV
6Not LockedUnknown00 Hz0.0 dBmV
7Not LockedUnknown00 Hz0.0 dBmV
8Not LockedUnknown00 Hz0.0 dBmV

Downstream OFDM Channels 
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
1Locked0, 1, 2, 3159300000000 Hz9.3 dBmV42.8 dB1108 ~ 298740555362861437364412
2Not Locked000 Hz4.5 dBmV0.0 dB0 ~ 4095000

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

Current System Time: Mon Aug 16 15:54:14 2021
System Up Time: 2:16:57
Message 3 of 11
EMH
Tutor
Tutor

Re: CM1000 Upstream Light Keeps Turning Amber

Interesting.

Firmware lised for my CM1000-1AZNAS for my ISP: V3.01.04

My firmware: V6.01.07

 

Does the ISP push these down? If not, how else could I have gotten there if I didn't do it myself?

 

Thanks!

Message 4 of 11
FURRYe38
Guru

Re: CM1000 Upstream Light Keeps Turning Amber

Yes Only the ISP will push FW...

Message 5 of 11
plemans
Guru

Re: CM1000 Upstream Light Keeps Turning Amber

Are you using an amplifier on the coax line? Or a signal attenuator?

Based off the power of your downstream channels, your upstream is rather high. (high enough to cause issues)

Reason I ask is, when you're close to a hub, your downstream will be higher and the upstream tends to run lower. 

If you're further away, you have lower downstream and higher upstream. Your numbers downstream indicate you're close to a hub but your upstream indicates your further away. so somethings a bit funky there. 

Got a copy of the event logs?

Message 6 of 11
EMH
Tutor
Tutor

Re: CM1000 Upstream Light Keeps Turning Amber

@plemans  Great call. I do have an amplifier in the system, but since I cancelled cable a couple of years ago, I am wondering about its necessity. I will have to address that as soon as I am able. 

 

I am learning (I think) much from your and Furry's posts. I intend to explore such things more when I have a bit longer window to address.

 

In short - I have the ADT hub up and running again. After hours spent re-routing, by-passing and exchanging out components, it is working again with the original hardware configuration. I am not certain that this was the fix, but Furry's reminder of the basics did cause me to think about the coax cables again and whether they were all firmly connected. I worked from the cable modem backwards re-tightening all connections. Thereafter, the upstream channel locks inceased and the recertification if the ADT hub went through. KISS principle strikes again (I believe).

 

To be sure there is more in the system to tweak. I'll provide more information in the log to address the power discrepancies later on and get back to you both. Thank you very much for you help to date. 

Message 7 of 11
plemans
Guru

Re: CM1000 Upstream Light Keeps Turning Amber

If you do get issues, pull that amplifiers out and get a snip of your power levels. 

Running 58dbmv on the upstream will cause issues. 

If your downstream falls into a decent level, you probably don't need the amplifiers. 

If you're needing it for tv, you could use a splitter with one leg going to the modem and the other running to the amp. 

Message 8 of 11
vkdelta
NETGEAR Expert

Re: CM1000 Upstream Light Keeps Turning Amber

This is too high of US power. 

Normal D3.0 US spec is 51dBmV

Extended US power can do anywhere from 54dBmV to 56dBmV sometimes.

 

58dB and that too with 5 US is really pushing it too far.

Need to be reduced to mid-high 40s ideally. 

Message 9 of 11
EMH
Tutor
Tutor

Re: CM1000 Upstream Light Keeps Turning Amber

OK. Will explore solution in near future. In the meantime, can anyone elucidate the problem hiw US power causes (i.e. what are the symptoms)? 

Message 10 of 11
vkdelta
NETGEAR Expert

Re: CM1000 Upstream Light Keeps Turning Amber

you will suddenly loose US bonding (and thats why you see Amber US light since it is working in single US channel mode)

AND/OR you will partial US service 

AND/OR you see lot of T3/T4 as well when modem cannot push even more power.

 

 

Message 11 of 11
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