pugzinho's profile

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3 Messages

Mon, Aug 17, 2020 4:00 PM

Netgear CM1200 Timeouts, packet loss nightmare

I have had Xfinity service in my home since July 2020 and have been having issues ever since. I have a BRAND NEW Docsis 3.1 Netgear CM1200 that constantly times out, loses packets (20-100%), and disconnects entirely for minutes at a time. I am directly connected to my PC, I have also tried with a router, to no avail. I have had a line tech out and a tech in the house who both said the problem was the modem. But replacing it wouldn't help and that the issue could be resolved by Xfinity techs, just not them.... I have tried using my 2 year old Docsis 3.0 Netgear modem and it works just fine, except I pay for gigabit service and need a 3.1 to get the speeds I'm paying for. Why does Xfinity put their logo on the box of this product if it isn't supported and techs can't fix it??? Occassionally the upstream light on my modem will flash also as if it is unable to lock. Further there are times when I only have 1 upstream bonded channel in my modem GUI. I would assume this was a problem with my specific modem had I not read about posts as recent as today with people who have the same modem and same problem. This is either a firmware issue, or a configuration problem that needs to be remedied.




Cable Connection
Apply               Cancel     
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
Acquire Downstream Channel405000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
IP Provisioning ModeHonor MDDhonorMdd(4)
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM2561405000000 Hz13.6 dBmV40.8 dB00
2LockedQAM2562411000000 Hz13.7 dBmV40.8 dB00
3LockedQAM2563417000000 Hz13.6 dBmV40.8 dB00
4LockedQAM2564423000000 Hz13.7 dBmV40.7 dB00
5LockedQAM2565429000000 Hz13.9 dBmV40.7 dB00
6LockedQAM2566435000000 Hz14.3 dBmV40.8 dB00
7LockedQAM2567441000000 Hz14.2 dBmV40.6 dB00
8LockedQAM2568453000000 Hz12.8 dBmV40.2 dB00
9LockedQAM2569459000000 Hz13 dBmV40.2 dB00
10LockedQAM25610465000000 Hz13.2 dBmV40.3 dB00
11LockedQAM25611471000000 Hz13.1 dBmV40.2 dB00
12LockedQAM25612477000000 Hz13.2 dBmV40.1 dB00
13LockedQAM25613483000000 Hz13.2 dBmV40.1 dB00
14LockedQAM25614489000000 Hz13.3 dBmV40.1 dB00
15LockedQAM25615495000000 Hz13.3 dBmV40.1 dB00
16LockedQAM25616501000000 Hz13.4 dBmV40.1 dB00
17LockedQAM25617507000000 Hz13.6 dBmV40.1 dB00
18LockedQAM25618513000000 Hz13.6 dBmV40 dB00
19LockedQAM25619519000000 Hz13.6 dBmV40 dB00
20LockedQAM25620525000000 Hz13.7 dBmV40.1 dB00
21LockedQAM25621531000000 Hz13.6 dBmV40 dB00
22LockedQAM25622537000000 Hz13.6 dBmV39.9 dB00
23LockedQAM25623543000000 Hz13.5 dBmV39.9 dB00
24LockedQAM25624549000000 Hz13.2 dBmV39.7 dB00
25LockedQAM25625555000000 Hz13.2 dBmV39.7 dB00
26LockedQAM25626561000000 Hz13.2 dBmV39.6 dB00
27LockedQAM25627567000000 Hz13.1 dBmV39.5 dB00
28LockedQAM25628573000000 Hz13 dBmV39.4 dB00
29LockedQAM25629579000000 Hz12.9 dBmV39.4 dB00
30LockedQAM25630585000000 Hz13.1 dBmV39.3 dB00
31LockedQAM25631591000000 Hz13.1 dBmV39.3 dB00
32LockedQAM25632597000000 Hz13.5 dBmV39.3 dB00
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA15120 Ksym/sec35600000 Hz45 dBmV
2LockedATDMA25120 Ksym/sec29200000 Hz45.5 dBmV
3LockedATDMA35120 Ksym/sec22800000 Hz44 dBmV
4LockedATDMA45120 Ksym/sec16400000 Hz43.5 dBmV
5LockedATDMA51280 Ksym/sec39600000 Hz49.5 dBmV
6Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
Downstream OFDM Channels
Modulation /
Profile ID
FrequencyPowerSNR /
Active Subcarrier
Number Range
1Locked0 ,1159690000000 Hz14.4 dBmV39.0 dB1246 ~ 28493373251040169840
2Not Locked000 Hz0 dBmV0.0 dB0 ~ 4095000
Upstream OFDMA Channels
ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
1Not Locked000 Hz0 dBmV
2Not Locked000 Hz0 dBmV
Extended Upstream Transmit Power
Enable Extended Upstream Transmit Power
Current System Time:Mon Aug 17 16:59:03 2020
System Up Time:00:16:46





21 Messages

7 m ago

Same issue here, but with difference cable modems AND the Xfinity XB7 gateway. You aren't alone. My story here if you want to read it - https://forums.xfinity.com/t5/Your-Home-Network/Major-Internet-Issues-Any-Ideas/td-p/3375432


Frequent Visitor


5 Messages

7 m ago

I am in the same boat. Upload light will start flashing and I lose all connection. Some days the internet stays up for 6-10 hours, today reset the modem and it crashed within 2 mins. I've had 3 techs out in the last month. My most recent appointment was yesterday and the supervisor came out with the tech

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