Internet Keeps Dropping

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Datalink
Resident Expert
Resident Expert
Posts: 7,336

Re: Internet Keeps Dropping

@JK6399 if your OFDMA channels are showing inactive, and you're still seeing disconnects, I'd say that you have a cable signal problem of some type.  Are we talking about ethernet connected devices in this case?  Disconnects with Wifi don't necessarily indicate the same issue is at hand.

 

Can you log into your modem, navigate to the STATUS .... DOCSIS WAN tab and copy the Downstream Overview, from that line all the way to the bottom of the OFDM/OFDMA Overview.  Select that entire area, then right cick .... Copy.  In a new post, right click .... Paste.   That should paste in the entire table as it appears in the modem.  Disregard the data that sits above the Downstream Overview. 



Damascus
I've Been Here Awhile
Posts: 2

Re: Internet Keeps Dropping

Thanks for the reply @Datalink. Yea I tried that this morning when I saw some of the posts saying their OFDM channels are being disabled, tried it again now but still no luck. It's not a line issue as I've had 2 techs in the past week come to check, and the tech yesterday also replaced the modem. 

tulowindow
I Plan to Stick Around
Posts: 19

Re: Internet Keeps Dropping

one issue resolved, but another remains.

 

The latency spikes are out of control. Some games you won't notice it because the way the game handles ping adversity is good and you can't tell because it doesn't affect you locally.

 

Other games, you "rubber-band" and it redraws everything that just happened, so basically you "do something" in game and see it on your screen, but the game rubber bands you back to 5 seconds prior and all of the events happen again but usually it causes a weird after effect where your movement gets messed up and you bang into walls and such.

 

Obviously it's great to not be disconnecting, but if you game... several games will experience this brutal issue.

augmentium
I Plan to Stick Around
Posts: 40

Re: Internet Keeps Dropping

@tulowindow
Is your modem bridged to a router? Since OFDMA was disabled two days ago & tweaking our ASUS AC3100 router, the network has been running very well. Even my son’s Switch which has normally been very laggy. I’m hoping I haven’t just jinxed things!
JK6399
I'm Here A Lot
Posts: 7

Re: Internet Keeps Dropping

@Datalink thanks for reply, there were many tech. visit and also troubleshoot on rogers tech. support with no result (every time tech visit home, removing/installing couple of filters, new connector and replace modem). Works for couple of days, some time week, and start issue again.And yes, it's ethernet connected device, not a wifi.

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1591000000QAM2561.400738.983
2597000000QAM2562.299838.983
3603000000QAM2563.799938.983
4849000000QAM2566.000238.605
5855000000QAM2565.500338.605
6861000000QAM2563.900438.605
7579000000QAM256-0.599537.636
8585000000QAM2560.500638.983
9279000000QAM256-3.700137.636
10609000000QAM2565.0991038.983
11615000000QAM2564.5001138.983
12621000000QAM2564.0001238.983
13633000000QAM256-0.2001338.983
14639000000QAM256-1.0001438.605
15645000000QAM256-1.0991538.605
16651000000QAM256-0.7001637.636
17657000000QAM2560.0001737.636
18663000000QAM2561.4001837.636
19669000000QAM2563.4001938.605
20675000000QAM2565.8002037.636
21681000000QAM2568.5002138.605
22687000000QAM25610.1992238.983
23693000000QAM2568.6992338.605
24699000000QAM2566.5992437.636
25705000000QAM2564.5992537.636
26711000000QAM2563.2002637.636
27717000000QAM2561.9002737.636
28723000000QAM2561.0992837.636
29825000000QAM256-1.0002938.605
30831000000QAM2560.0003037.636
31837000000QAM2562.4003138.605
32843000000QAM2564.8003238.605
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
14K275600000YESYESYES-2.799999
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
13230000064QAM47.77036400000
23870000064QAM47.52046400000
32110000064QAM46.01013200000
42590000064QAM47.27026400000
50QAM_NONE----1600000
60QAM_NONE----1600000
70QAM_NONE----1600000
80QAM_NONE----1600000
OFDM/OFDMA Overview
Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
0DISABLED0.00000.00000.00000.00000.00002K
1DISABLED0.00000.00000.00000.00000.00002K
Datalink
Resident Expert
Resident Expert
Posts: 7,336

Re: Internet Keeps Dropping

@JK6399 here are your signal levels:

 

JK6399 Signal Levels.png

 

There's no way that this meets spec.  Ask @RogersAndy, Moin, Corey, or Tony to check the OFDM MIBS which is the OFDM sub-channel data just to see if its ok. The OFDM channel runs from 350 Mhz up to 447 Mhz, so within that frequency band there is a signal rise which might be ok for the OFDM channel to operate.  The question is, what do those signal levels do to the automatic gain control that the modem is probably running. Don't know but thats a question that I'd be asking.  

 

Personal opinion, you have a combination of a neighbourhood node or line amplifier problem coupled with a cable issue. 

 

1.  Has the external cable been replaced during all of this?  

 

2.  Do you have underground or overhead cabling?  With underground cabling the techs can run a check to determine if there are any breaks in the cable and it can be tested from both ends.  Thats a Time Domain Reflectometry (TDR) test to look for problems in a length of cable.  It will pinpoint the first, maybe more, locations in a cable where there might be a break or reflection caused by a short.  

 

https://en.wikipedia.org/wiki/Time-domain_reflectometer

 

If you have overhead cabling, I wouldn't expect a tech to climb a utility pole to run the test, but, hey, you never know.  

 

I think you need a Senior tech (real Rogers tech) to look into this, or possibly a maintenance crew, which the moderators can arrange.  

 

That signal line should be a flat line at 0 dBmV, not bouncing all over the place.  There is no way that the signal levels are within the maximum slope allowed by Rogers or the DOCSIS specs. 



tulowindow
I Plan to Stick Around
Posts: 19

Re: Internet Keeps Dropping

Yes, I'm bridged and also on an asus router, but I don't think there are any settings in my router that are going to prevent latency jumps. I've tried bridged and just connected directly to the modem. No matter what, I get these spikes. I just finished trying to play a game mid day while my kid napped and it was infuriating. Just rubber banding around because of these latency hops. It's terrible.

JK6399
I'm Here A Lot
Posts: 7

Re: Internet Keeps Dropping

@Datalink thanks again, I have underground cable running to my home ( not sure anytime cable was replaced), couple of times Rogers tech open up outside green junction box, replaced connector there and other end at box mounted on wall of home.
And that’s the request I kept putting to look at this issue by some experts or second or third level technicians. Every time calling to Rogers support, they do basic troubleshooting for hours with repeating steps, then putting tickets for monitoring and last getting sms to book a tech to visit home.
After tech visit, tickets will be closed. Most of the time field tech or maintenance guys monitor the issue ( as per support tech) and ask to book tech for home visit, but it’s not going beyond to this points, both teams ( maintenance and home techs) kicking the ball to each other’s court, and issue remains there.
Lately I stopped calling tech support unless it’s down for long time or more frequently connection going down, otherwise keep doing reboot to modem, that’s most of the time fixed issue temporary.
I have no clue, where to go for help regarding this ( as keep calling and spoke to tech support not really resolving any real issue).
Datalink
Resident Expert
Resident Expert
Posts: 7,336

Re: Internet Keeps Dropping

@JK6399 talk about absolutely frustrating.  Ok, @RogersTony @RogersAndy @RogersMoin @RogersCorey the ball is in your court .........



augmentium
I Plan to Stick Around
Posts: 40

Re: Internet Keeps Dropping

@tulowindow

What router do you have? There are a number of more advanced settings on the router that can be tried. I’m no expert, just went to SNB Forums and did some asking & reading. However if you’re having the same problems in gateway mode, then it’s probably something else.