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T3/T4 timeouts and disconnects

Hi,

I have the 200mbps package and the internet disconnects intermittently. I noticed some T3/T4 timeouts in the event logs. Below is the stats of the modem.

 

Downstream

 DCIDFreqPowerSNRModulationOctetsCorrectedsUncorrectables
Downstream 124855.00 MHz4.40 dBmV37.36 dB256QAM6626980584110
Downstream 29765.00 MHz4.20 dBmV38.61 dB256QAM2763846713180
Downstream 310771.00 MHz4.00 dBmV38.61 dB256QAM2734630184170
Downstream 411777.00 MHz3.90 dBmV37.64 dB256QAM2738559780613227801
Downstream 512783.00 MHz3.70 dBmV37.64 dB256QAM2746987952656739862
Downstream 613789.00 MHz3.40 dBmV37.36 dB256QAM2688950995770
Downstream 714795.00 MHz3.30 dBmV37.36 dB256QAM271796408340
Downstream 815801.00 MHz3.20 dBmV37.36 dB256QAM260085486810
Downstream 916807.00 MHz3.20 dBmV37.64 dB256QAM3534445416110
Downstream 1017813.00 MHz3.50 dBmV37.64 dB256QAM251686790340
Downstream 1118819.00 MHz3.50 dBmV37.64 dB256QAM3475768963230
Downstream 1219825.00 MHz3.60 dBmV37.36 dB256QAM35636834685391631
Downstream 1320831.00 MHz3.70 dBmV37.36 dB256QAM376558787817291483
Downstream 1421837.00 MHz3.80 dBmV37.64 dB256QAM3685273890110
Downstream 1523849.00 MHz4.40 dBmV37.64 dB256QAM3188377587140
Downstream 1632903.00 MHz6.40 dBmV37.36 dB256QAM4957637518160
Reset FEC Counters

Upstream

 UCIDFreqPowerChannel TypeSymbol RateModulation
Upstream 1224.20 MHz46.00 dBmVDOCSIS2.0 (ATDMA)5120 kSym/s64QAM
Upstream 2437.00 MHz47.25 dBmVDOCSIS2.0 (ATDMA)5120 kSym/s64QAM
Upstream 3330.60 MHz46.25 dBmVDOCSIS2.0 (ATDMA)5120 kSym/s64QAM
Upstream 4119.40 MHz45.50 dBmVDOCSIS1.x (TDMA)2560 kSym/s16QAM

 

What should I do?

 

Thanks.

Herman

13 REPLIES 13
Lead Moderator

Re: T3/T4 timeouts and disconnects

Good morning!

 

There is a list of additional information that would be helpful for your peers to help diagnose the the issue:

 

DATA-TO-POST-TO-GET-HELP-FROM-THE-COMMUNITY

 

Regards,
Julia R.
Spectrum-Social Media Customer Care
Lead Moderator-Community Forums

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Re: T3/T4 timeouts and disconnects

The line to the modem is direct from the street, no splitters. I have a separate line from the street to the TVs, which has splitters.

Lead Moderator

Re: T3/T4 timeouts and disconnects

Are all of the lines from the splitter used or have terminators? 

 

Are you able to post your modem logs for review. I am seeing an issue 

definitely with several of your channels.  777.00 is a TV broadcast frequency.

 

There may be connections that are not tight. Are you able to check the connections, make sure they are all slightly tighter than you can do by hand? 

 

What is your zip code, we can try to find out what local TV channels broadcast on 

those. 

 

I would recommend contacting us directly here for an appointment if you find there

is no damage to the coaxial cable or all of the connections are tight.   Forums_Help

 

Regards,
Julia R.
Spectrum-Social Media Customer Care
Lead Moderator-Community Forums

 

Highlighted
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Re: T3/T4 timeouts and disconnects

Yes, all the lines go to TVs or have terminators on them. But these lines are separate from the line to the modem. I have a line from the street to the modem, separate from the line that splits to the TVs.

 

Here are the logs from the modem.

 

Date TimeEvent IDEvent LevelDescription
4/19/2018 20:06820005003Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/19/2018 21:38840007005RCS Partial Service;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/19/2018 22:12820002003No Ranging Response received - T3 time-out;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/20/2018 0:08840007005RCS Partial Service;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/20/2018 1:08820002003No Ranging Response received - T3 time-out;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/20/2018 9:33840007005RCS Partial Service;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/20/2018 14:35820002003No Ranging Response received - T3 time-out;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/20/2018 18:53840007005RCS Partial Service;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/20/2018 19:50820002003No Ranging Response received - T3 time-out;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/21/2018 1:29840007005RCS Partial Service;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/21/2018 3:04820002003No Ranging Response received - T3 time-out;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/21/2018 16:58840007005RCS Partial Service;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/22/2018 20:39820002003No Ranging Response received - T3 time-out;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/24/2018 22:10680103004DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/24/2018 22:10680106006DHCP Renew - lease parameters time server-98.150.3.95;tftp file-?BEWGlykUq_DWNlIKa9Gu@CmvRrqORn6dyYn58gM2CLBndJqou08_e modified;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/25/2018 0:34840007005RCS Partial Service;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/25/2018 18:08820002003No Ranging Response received - T3 time-out;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/25/2018 19:41840007005RCS Partial Service;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/26/2018 21:02820002003No Ranging Response received - T3 time-out;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;
4/27/2018 23:34840007005RCS Partial Service;CM-MAC=14:ab:f0:d6:36:52;CMTS-MAC=00:01:5c:74:7e:48;CM-QOS=1.1;CM-VER=3.0;

 

The connections are secure and done with a wrench.

 

My zip code is 96822.


Thanks.

 

Herman

Helper

Re: T3/T4 timeouts and disconnects

All those T3 timeouts are upload issues. Your modem is trying to reach out to the Spectrum server but can't reach it within the allotted time frame. If all of your connections are tight (even behind the wallplates), there is no visible corrosion or damaged coax that is properly grounded the issue may be at the street or even further back to the node or headend. This would require a tech visit to check out everything at your house to the street, then would likely require that tech to schedule another type of tech if the problem is further upstream.

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Re: T3/T4 timeouts and disconnects

I have an attenuator attached to the modem. It reads 6-FAM. This was installed by a tech a long time ago. Would this be causing the issues?

Proven Sharer

Re: T3/T4 timeouts and disconnects


@Julia_Rwrote:

Are all of the lines from the splitter used or have terminators? 

 

Are you able to post your modem logs for review. I am seeing an issue 

definitely with several of your channels.  777.00 is a TV broadcast frequency.

 


777 MHz is NOT an over-the-air TV broadcast channel - those stop at 650.0 MHz.  The 776.01 to 787.99 MHz slot belongs to Verizon Wireless, used for 4G/LTE subscriber service.  The corresponding cell site transmitters are 30 MHz lower, from 746.01 to 757.99 MHz.  That's why I often focus on cell site ingress when I see high uncorrected errors on 741 and 747 or 771 and 777.

Proven Sharer

Re: T3/T4 timeouts and disconnects


@hermanwrote:

I have an attenuator attached to the modem. It reads 6-FAM. This was installed by a tech a long time ago. Would this be causing the issues?


Based on the incoming signal levels that your modem has reported, you need to leave that 6dB attenuator in place. It is not the cause of your issue.   T3 errors are brief losses of incoming (DS) channel signals from the CMTS server, while T4 errors are extended (longer than 3 seconds) loss of signals. 

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Re: T3/T4 timeouts and disconnects

Thank you everyone for your responses. I'm learning a lot about signals and how they can be affected by other wireless signals. So I'm guessing there is not much I can do if the interference is from wireless carriers?