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GoNadz
Level 1: Cadet

Intermittent cable connection

Hi all,

I have a cable connection which has worked almost without a hitch for many years. I am on a relatively new telstra issued modem (5 years old at most) and the problem is this. For over a week my connection has been intermittent to the point that netflix is impossible to watch. The connection is great, when it is working but when it drops out you can't even load a web page or use email. The connection between computer and modem stays fine, its just that the telstra dns server can't be connected to and my browser tells me to log in. 5 min later its working just fine without me doing anything. Then it will happen again a minute or two later. After a week the frustration is behinning to set in. According to telstra there are no outages or service issues in my area in adelaide, just this incredibly unreliable connection. Is anyone else having this issue?? Oh BTW, rebooting the modem does diddly squat. It starts working and stops working when it feels like it and nothing I do makes any difference to it.

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7 REPLIES 7
Level 22: Superhuman

Re: Intermittent cable connection

There are a lot of  (unusual)   cable issues.

In most cases, it's NBN, who now own and control the cable, preparing it for NBN use.

As they are within about a year of completion, there is every chance that is the cause.

A "Like" is always appreciated. If my advice is a solution, please mark it. I'm not a Telstra employee.
50 + years exp. in radio comms., eg mobile phones since 1963, two-way radios, base stations, antennas & pagers. One of my mottos: "Believe in yourself, and you can accomplish anything".
Level 24: Supreme Being
Level 24: Supreme Being

Re: Intermittent cable connection

It could be an intermittent fault on the cable or the street cabling equipment. Could you post your line stats (voltage and power levels). Some one here might be able to tell from these stats if there is a fault. You will find these stats here

 

On a Cable Home Network Gateway
(CG3100D):
http://192.168.0.1/ > Connection (Under Maintenance)

On a Cable Gateway Max
(C6300BD):
http://192.168.0.1/ > Advanced > Broadband Connection > Connection Settings

 

 

GoNadz
Level 1: Cadet

Re: Intermittent cable connection

Lock Status Modulation Channel ID Symbol Rate (sym/sec) Frequency (Hz) Power (dBmV) SNR (dBmV) DOCSIS Locked
Locked QAM256 1 6952000 sym/sec 359000000 Hz 5.7 dBmV 39.0 dB EuroDOCSIS
Locked QAM256 2 6952000 sym/sec 367000000 Hz 6.6 dBmV 39.6 dB EuroDOCSIS
Locked QAM256 3 6952000 sym/sec 375000000 Hz 5.4 dBmV 38.7 dB EuroDOCSIS
Locked QAM256 4 6952000 sym/sec 383000000 Hz 6.4 dBmV 39.2 dB EuroDOCSIS
Locked QAM256 5 6952000 sym/sec 391000000 Hz 6.6 dBmV 39.2 dB EuroDOCSIS
Locked QAM256 6 6952000 sym/sec 399000000 Hz 7.1 dBmV 39.3 dB EuroDOCSIS
Locked QAM256 7 6952000 sym/sec 407000000 Hz 7.6 dBmV 39.6 dB EuroDOCSIS
Locked QAM256 8 6952000 sym/sec 415000000 Hz 6.9 dBmV 39.1 dB EuroDOCSIS
Locked QAM256 9 6952000 sym/sec 438000000 Hz 7.6 dBmV 39.3 dB EuroDOCSIS
Locked QAM256 10 6952000 sym/sec 446000000 Hz 6.8 dBmV 38.7 dB EuroDOCSIS
Locked QAM256 11 6952000 sym/sec 454000000 Hz 7.3 dBmV 39.1 dB EuroDOCSIS
Locked QAM256 12 6952000 sym/sec 462000000 Hz 7.7 dBmV 39.3 dB EuroDOCSIS
Locked QAM256 13 6952000 sym/sec 470000000 Hz 7.3 dBmV 39.2 dB EuroDOCSIS
Locked QAM256 14 6952000 sym/sec 478000000 Hz 7.1 dBmV 38.6 dB EuroDOCSIS
Locked QAM256 15 6952000 sym/sec 486000000 Hz 7.3 dBmV 38.3 dB EuroDOCSIS
Locked QAM256 16 6952000 sym/sec 494000000 Hz 6.9 dBmV 38.1 dB EuroDOCSIS

 

Is that what you wanted to know?

Level 24: Supreme Being
Level 24: Supreme Being

Re: Intermittent cable connection

Thanks for posting those stats, they are the ones I wanted. I am not very familiar with Telstra cable but those stats look okay. @343GuiltySpark  or @Yastiandrie  would be able to give you a more expert opinion.

 

Mkrtich
Level 12: Master Detective

Re: Intermittent cable connection

Your cable connection is healthier than my earlier version Netgear CG3100D2 which is an 8/1 Channel unit - my figures are - DOWN power varies from 8.3 to 9.6 dBmv and SNR 41.9 to 42.5 dB and UP power 36.5 dBmv. So your modem is not driven as hard as mine to get you the connection and your Signal to Noise Ratio figures are only marginally different to mine. I am on Telstra HFC at 100/5 Mbps. I take it you have the 16/4 Channel Netgear CG6300BD unit which is a better modem with its dual band 802.11 ac Wi-Fi support and stronger amplifiers. 

 

@ProfessorPhonehas a valid point in regards to possible cable interruptions in your area that may be happening when people in your suburb are converting from Telstra HFC to NBN HFC.  There may be some things in your devices that could indicate the source of any local issues.

 

"The connection is great, when it is working but when it drops out you can't even load a web page or use email. The connection between computer and modem stays fine, its just that the telstra dns server can't be connected to and my browser tells me to log in".

 

Is your computer and TV/Streaming device LAN cable connected to the Netgear or via Wi-Fi? In case you are getting any recent interference from neighbouring Wi-Fi networks, you may get some improved stability by checking a few things in the Modem. Hoping one of these suggestions may assist. 

 

1. I have found that the 2.4 Ghz is more stable on the 20Mhz band width setting, and not the Auto 20/40.

2. Wireless Multi Media setting - ON.

3. Apple needs UPnP to be ON.

4. My unit has no IGMP Snooping function, a recent post indicated when a modem has this function ON, it fixed the author's Chromecast issue. 

5. The CD6300BD supports Netgear proprietary Beamforming+ which works with Netgear adapters - it may assist if it is Disabled. Not sure if you will then see two SSID's in this model, but if your devices are 2.4Ghz, lock them into connecting to the 2.4 Ghz radio.

6. 'Browser requesting you to re login' - may pay to test with another browser or Clear Our Data Cache, History and Cookies. The condition can sometimes happen if the Browser gets confused due to a corrupted entry in its Cache and loops back to the modem's log-in screen instead of your desired webpage. 

 

GoNadz
Level 1: Cadet

Re: Intermittent cable connection

Everything is connected to the modem by LAN cable, it avoids the problems of signal loss due to WiFi, lol, so its not RF interference. Its also true that I had cleared some of the modems logs recently to try and locate the problem in the system so the data I posted may not contain a record of the problem times. I don't know whether clearing some of the system logs clears them all or not.

As for the browser, its set to clear the cache's every time it closes and I regularly use a secondary program to clean what's left (keeps computer clutter to a minimum) so I doubt its a corrupted cache problem. The apple TV box also says there is no internet connection, when the drop outs happen and that has a separate cable to the modem.

 

Just FYI the modem is the netgear C6300BD.

 

The NBN was rolled out to my area about 6 months ago but as yet I haven't made the change over. Is it possible that these issues are Telstra's way of prompting me to make the change, rofl.

 

Last but not least, is it possible that people around me making the change over to the NBN could be interfering with my connection?

 

Anyhow, for the last day or two the problem of drop out seems to have subsided so hopefully the issue has been sorted. Thank you for everyone's help with this, it is appreciated.

GoNadz
Level 1: Cadet

Re: Intermittent cable connection

Sorry about that reference to people around me changing over, I just realised you mentioned that as an issue, lol.

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