Orbi WiFi 7 RBE973
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Re: CAX30 Timing Synchronization failure - Loss of Sync

ljmagyar
Star

CAX30 Timing Synchronization failure - Loss of Sync

I have a Nighhawk AX6 CAX30 AC2700 router that is dropping connection.

I have read through all the canned responses for this issue.

I have Firmware Version V1.4.10.8

There is no splitter

There is no amplifier

The coax is brand new from the node

I am on Comcast/XFinity.  Xfinity has been out 3 or 4 times because i keep complaining.  They have done all they can do with the line.  They gave me an xfi modem and set up a monitor.  The week that it was active there was not a single event of dropping the connection.

 

On 12/15 I spent time on a call with Netgear support on which we performed the following:

Disconnect all but power connection

Press and hold reset button for 30 seconds

Remove poer connection

Press and hold reset button for 30 seconds

Reconnect power

Press and hold reset button for 30 seconds.

 

The modem worked fine for 3 days and now is back to dropping connection

 

A review of the logs shows this:

 

2021-12-19 13:05:52Notice (6)DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=6c:cd:d6:80:fb:a4;CMTS-MAC=00:01:5c:92:1a:66;CM-QOS=1.1;CM-VER=3.1;

1970-01-01 00:00:35

Notice (6)Honoring MDD; IP provisioning mode = IPv6
1970-01-01 00:00:30Critical (3)No Ranging Response received - T3 time-out;CM-MAC=6c:cd:d6:80:fb:a4;CMTS-MAC=00:01:5c:92:1a:66;CM-QOS=1.1;CM-VER=3.1;
1970-01-01 00:00:24Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=6c:cd:d6:80:fb:a4;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2021-12-19 12:20:14Critical (3)No Ranging Response received - T3 time-out;CM-MAC=6c:cd:d6:80:fb:a4;CMTS-MAC=00:01:5c:92:1a:66;CM-QOS=1.1;CM-VER=3.1;
2021-12-19 12:20:06Critical (3)SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=6c:cd:d6:80:fb:a4;CMTS-MAC=00:01:5c:92:1a:66;CM-QOS=1.1;CM-VER=3.1;

 

The cable connection info is this:

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 
 
<tabindex=-1>Startup Procedure</tabindex=-1>
ProcedureStatusComment
Acquire Downstream Channel507000000 HzLocked
Connectivity StateOKRegistration Complete
Boot StateOKOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDIPv6 only
 
<tabindex=-1>Downstream Bonded Channels</tabindex=-1>
 
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectabables
1Locked256 QAM5507000000 Hz4.9 dBmV42.6 dB00
2Locked256 QAM2483000000 Hz4.7 dBmV42.5 dB00
3Locked256 QAM3489000000 Hz4.8 dBmV42.7 dB00
4Locked256 QAM4495000000 Hz4.6 dBmV42.4 dB00
5Locked256 QAM6513000000 Hz4.5 dBmV42.4 dB00
6Locked256 QAM7519000000 Hz4.4 dBmV42.2 dB00
7Locked256 QAM8525000000 Hz4.7 dBmV42.4 dB00
8Locked256 QAM9531000000 Hz4.9 dBmV42.5 dB00
9Locked256 QAM10537000000 Hz5.0 dBmV42.5 dB00
10Locked256 QAM11543000000 Hz4.8 dBmV42.4 dB00
11Locked256 QAM12549000000 Hz4.5 dBmV42.3 dB00
12Locked256 QAM13555000000 Hz4.5 dBmV42.3 dB00
13Locked256 QAM14561000000 Hz4.6 dBmV42.4 dB00
14Locked256 QAM15567000000 Hz4.8 dBmV42.4 dB00
15Locked256 QAM16573000000 Hz4.8 dBmV42.3 dB00
16Locked256 QAM17579000000 Hz4.8 dBmV42.3 dB00
17Locked256 QAM18585000000 Hz4.8 dBmV42.4 dB00
18Locked256 QAM19591000000 Hz4.9 dBmV42.4 dB00
19Locked256 QAM20597000000 Hz5.3 dBmV42.5 dB00
20Locked256 QAM21603000000 Hz5.3 dBmV42.4 dB00
21Locked256 QAM22609000000 Hz5.2 dBmV42.4 dB00
22Locked256 QAM23615000000 Hz5.2 dBmV42.4 dB00
23Locked256 QAM24621000000 Hz5.3 dBmV42.3 dB00
24Locked256 QAM25627000000 Hz5.4 dBmV42.4 dB00
25Locked256 QAM26633000000 Hz5.6 dBmV42.3 dB00
26Locked256 QAM27639000000 Hz5.3 dBmV42.4 dB00
27Locked256 QAM28645000000 Hz5.4 dBmV42.5 dB00
28Locked256 QAM29651000000 Hz5.4 dBmV42.1 dB00
29Locked256 QAM30657000000 Hz5.3 dBmV42.2 dB00
30Locked256 QAM31663000000 Hz5.5 dBmV42.2 dB00
31Locked256 QAM32669000000 Hz5.4 dBmV42.2 dB00
32Not LockedUnknown00 Hz0.0 dBmV0.0 dB00
 
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
 
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA11280 Ksym/sec35600000 Hz42.3 dBmV
2LockedATDMA21280 Ksym/sec29200000 Hz42.3 dBmV
3LockedATDMA31280 Ksym/sec22800000 Hz41.0 dBmV
4LockedATDMA41280 Ksym/sec16400000 Hz40.3 dBmV
5LockedATDMA51280 Ksym/sec39600000 Hz43.0 dBmV
6Not LockedUnknown00 Ksym/sec0 Hz0 dBmV
7Not LockedUnknown00 Ksym/sec0 Hz0 dBmV
8Not LockedUnknown00 Ksym/sec0 Hz0 dBmV
 
<tabindex=-1>Downstream OFDM Channels</tabindex=-1>
 
ChannelChannel IDIndicatorSubcarrier Zero FrequencyActive Subcarrier Number RangeTotal CodewordsUncorrectable Codewords
137Non-Primary617.6 MHz1108 ~ 2987114164670
20Other0 MHz0 ~ 000
 
<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
 
ChannelUpstreamIsMutedRanging StatusSubcarrier Zero FrequencyActive Subcarrier Number RangeSymbols Per FrameTx Power
1 Other0 MHz0 ~ 000 dBmV
2 Other0 MHz0 ~ 000 dBmV
 
  
 
Current System Time: 2021-12-19 14:00:36
System Up Time: 00:56:20

 

It is rather frustrating that such a high-end router is actually not as good as I was lead to believe by the reviews and ratings.

Message 1 of 8
FURRYe38
Guru

Re: CAX30 Timing Synchronization failure - Loss of Sync

Try a different CAX modem? If all as been checked and tried, possible faulty unit is all. 

Message 2 of 8
ljmagyar
Star

Re: CAX30 Timing Synchronization failure - Loss of Sync

Still dropping with sync errors.  Is this normal at all? Is there any reason that I should need to reboot the modem periodically?  With my ATT modem (previous house) i never had to reboot.  The XFinity modem does not crash either.  I don't want to use it or pay the extra $$ to do so, and it has less wifi range than the Netgear CAX30

Message 3 of 8
ljmagyar
Star

Re: CAX30 Timing Synchronization failure - Loss of Sync

So after a lengthy chat with netgear support, they have told me that my downstream power is too weak.  They told me that it is supposed to be between -7 dBmV and +7 dBmV.  Mine is running between 4 and 5 dBmV (see above info).

 

If I am at +4 or +5 dBmV, how is that too weak when the recommended band is MINUS 7 to PLUS 7 dBmV?  It must have been a language thing because "Sharon" and "Fatima" told me it is too weak at PLUS 4.

 

They quoted me this FAQ: https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router

"Good Downstream power levels are within -7 to +7 dBmV."

Message 4 of 8
FURRYe38
Guru

Re: CAX30 Timing Synchronization failure - Loss of Sync

Yes.

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.

 

Your modem should not need a reboot or power cycle to correct anything unless your troubleshooting something. 

Message 5 of 8
Phuclegau
Aspirant

Re: CAX30 Timing Synchronization failure - Loss of Sync

I think the problem was the firmware. I have issues with the wifi connection. When I first got it everything working great. Ally devices connect right away. After overnight the modem automatically updated to newest firmware which is .10.8. The oldest firmware was .10.4. So, how do I know that was firmware because I downgraded and it’s working fine. The modem automatically updated or check for newest firmware from 12-4 AM every time. I return and buy a new one. Same model same everything. Same issue. Working fine for a day then bumped. No wifi connection. Sometime slow connected on my phone but TV won’t able to connected. Called netgear support. They asking me to ask internet provider stop sending firmware update. It’s sound funny because internet provider has nothing to do with it. The manufacturer is the on creating new firmware. When ever the modem got internet it will check for update. I gave up and went back to my old modem and then everything working fine. I’m looking for a different modem different model because this CAX30 having firmware issues that cause so much problems on wifi connection.
Hopefully they will release a new firmware that will fix but I don’t think with in a day.
Return/ replacement or wait for it
Good luck
Message 6 of 8
FURRYe38
Guru

Re: CAX30 Timing Synchronization failure - Loss of Sync

Maybe applies to your experiences, however the OP has stated different experiences. 
Thanks. 

Message 7 of 8
ljmagyar
Star

Re: CAX30 Timing Synchronization failure - Loss of Sync

please stop hijacking my thread with a problem that is not the same issue

Message 8 of 8
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