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BSNL India broadband frequently goes off and on

  1. #1
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    Default BSNL India broadband frequently goes off and on

    I have a D-Link wifi router model # DSL-2750U. I use it to run two devices - a Win7 laptop and an Android cellphone.

    Very often, the ADSL light on the router starts blinking. Sometimes even if the ADSL is steady, the extreme right internet light changes from green to red.
    I understand that these interruptions may happen once in a while, but I am experiencing situations like "5 minutes on, 2 minutes off" for long cycles. To clarify, such interruptions happen for hours, and then it runs smooth. So, it is not a daily occurence, but quite frequent.
    Sometimes the problem gets solved after registering complaint (and, I have logged many in the past few months), and sometimes the problem gets solved after a few hours on its own.
    Additionally, I feel that the ISP side has issues, because in an "internet out" situation, sometimes clicking my browser homepage (simple google) takes me to BSNL's landing page mail.bsnl.in . And then, normalcy is restored.

    I found some advice on the net with respect to similar issues faced by others with BSNL. These are as below.

    a) "Disable all modulations except G.Dmt Enabled. This will limit the download speed to around 4.8 Mbps (4984 Kbps) and the upload speed to 207 Kbps. But can make the connection a lot more stable."
    I am a non-technical person, and understand only basic internet connectivity concepts. I checked my router's ADSL settings, and found that all are enabled (screenshot attached).
    My question : Should I keep only G.Dmt ticked, and all others unticked? Apparently, this provides a more stable internet at the cost of some speed. In the past three months, my download speed has ranged between 528 Kbps to 1.3 Mbps. Will I lose speed significantly, if I choose only G.Dmt?

    b) I also learnt that "SNR Margin should be high and line attenuation should be low". My ADSL statistics (screenshot attached) shows SNR Margin is around 6 dB, and Attenuation is 29 to 45 dB.
    Should SNR Margin be 20 dB plus, and Attenuation 20 dB minus? If so, my statistics is not good.
    Attached Images Attached Images

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    Hi, My best advice is just set your dns server settings to google open server . It will save you from vulnerability. Nowadays, bsnl support is not reachable quickly. And for problem like this, they will check the configuration menu and give the modem back to you , saying the modem has to be replaced.
    go to the network settings in the tray icon. Go to the Lan adopter settings. right click and select ip4settings. Then double click the same and select auto detect , instead of use the following. If you have entered something in the use the following ip. (Just make note of all the entries, including local ip address, subnet mask,default gateway, dns server , alternate server etc in case of any problem.) Now, choose dns server google, by entering 8.8.8.8 and alternate dns server as 8.8.4.4, check the box on valid when exit and check ok. Now, you will experience speed and good internet connection.
    The problem is the attackers of router changes your dns server to unknown server as you said in your post. bsnl.mail.in is the client of bsnl email. I do not trust those sites redirecting.
    When i checked with original configuration, it says that amazon.com is accessing the router. Now, when i change the google server, this problem is gone. Even if it bsnl mail com, this should not be redirected to this page, without the consent of users. They could do the convassing in sms and other sorts of things. Sorry for bsnl support. it does have dedicated staff at the middle level, but accessing top would take every energy out of you.
    The so called help lines would only give limited advice on changing the access points.
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    Thanks jraju for your reply, where you have mentioned about server settings.

    Any idea about my query, whether "G.Dmet" would help?

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    Hi, aba, It is my experience. If you go deep in to the settings, then you may get problem. Some one may advise you to update firmware. But if you do, then there is chance of modem becoming totally unusable.
    I do not go deep in to gmut or other settings. If you have the settings configured at the time of buying . Then it is better to just change the dns server settings. The problem of your occasional red light in internet , definitely shows, there is some fault in the dns settings done when you bought the modem. Ok.
    the server nos , even though given by the ISP, there is no maintenance of individual router settings. For example, my router was configured by some server at bangalore. Those points are now shown as weak or prone to vulnerable. I changed the modem to check. I was having a old modem. The same problem. Intermittant red light internet, leading to no internet access or belated internet access.
    Instead of changing those server nos. If you just change the dns server to google, your problem will be gone and you get your connections without any problem.
    Unless you log into secured dns, then there are software now in vogue which changes or try to change the dns server access to stop from accessing your router page or failing internet access.
    I have tested this and advise you.

    - - - Updated - - -

    Hi, aba,
    Please also see the link from this forum.
    http://www.indiabroadband.net/bsnl-b...dsl2-gdmt.html
    Where it is described to remain adsl rather than d.gmt
    Please read the thread fully to the end.It says that there is no marked improvement in speed ,when you change the mode. Please do accordingly
    SmoothVibes likes this.

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    Default Thanks for the update

    Hi jraju, Thank you for the update. In fact, I ran into similar advice somewhere on the net.

    By the way, I also understand that the analog telephone often disturbs broadband due to difference in frequency.
    Does a "DSL filter" attached to analog device help? It is said that only the splitter is not good enough.

    Quote Originally Posted by jraju View Post
    Hi, aba, It is my experience. If you go deep in to the settings, then you may get problem. Some one may advise you to update firmware. But if you do, then there is chance of modem becoming totally unusable.
    I do not go deep in to gmut or other settings. If you have the settings configured at the time of buying . Then it is better to just change the dns server settings. The problem of your occasional red light in internet , definitely shows, there is some fault in the dns settings done when you bought the modem. Ok.
    the server nos , even though given by the ISP, there is no maintenance of individual router settings. For example, my router was configured by some server at bangalore. Those points are now shown as weak or prone to vulnerable. I changed the modem to check. I was having a old modem. The same problem. Intermittant red light internet, leading to no internet access or belated internet access.
    Instead of changing those server nos. If you just change the dns server to google, your problem will be gone and you get your connections without any problem.
    Unless you log into secured dns, then there are software now in vogue which changes or try to change the dns server access to stop from accessing your router page or failing internet access.
    I have tested this and advise you.

    - - - Updated - - -

    Hi, aba,
    Please also see the link from this forum.
    http://www.indiabroadband.net/bsnl-b...dsl2-gdmt.html
    Where it is described to remain adsl rather than d.gmt
    Please read the thread fully to the end.It says that there is no marked improvement in speed ,when you change the mode. Please do accordingly

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    Hi, abe, Splitter is only split the signal to phone and adsl. The other things you talk about, i do not know. It is settings in the modem, which is complicate . You could see the snr settings. It is auto adjusted to suit your modem. If you know the settings configuration, then you could opt those.
    It is there in the router settings and it is normally configured to give the minimum audio disturbance. I think it is better to contact your ISP for any sound related issue in telephone. They will correct it by changing the telephone wire . If there is a small cut in the wire, then it will be fixed thro, their channel, by checking your line there and needy done.

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    Default DSL filter

    Thanks again, jraju.

    I had learnt about DSL filter here https://en.wikipedia.org/wiki/DSL_filter

    The main point is this : "A DSL filter or microfilter is an analog low-pass filter installed between analog devices (such as telephones or analog modems) and a plain old telephone service (POTS) line. The DSL filter prevents interference between such devices and a digital subscriber line (DSL) service connected to the same line. Without DSL filters, signals or echoes from analog devices at the top of their frequency range can reduce performance and create connection problems with DSL service, while those from the DSL service at the bottom of its range can cause line noise and other problems for analog devices. DSL filters are passive devices, requiring no power source to operate."

    Unfortunately, I have not been able to find DSL filter in local market.

    Quote Originally Posted by jraju View Post
    Hi, abe, Splitter is only split the signal to phone and adsl. The other things you talk about, i do not know. It is settings in the modem, which is complicate . You could see the snr settings. It is auto adjusted to suit your modem. If you know the settings configuration, then you could opt those.
    It is there in the router settings and it is normally configured to give the minimum audio disturbance. I think it is better to contact your ISP for any sound related issue in telephone. They will correct it by changing the telephone wire . If there is a small cut in the wire, then it will be fixed thro, their channel, by checking your line there and needy done.

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    Hi, It would have been supplied with the modem. It would have been already connected. It is the combo box type, having two jacks on one side and one jack on the other. You have to get two wires, from the splitter and then plug one in adsl and other in phone in the prescribed jacks in the filter. From the other side, you just plug the modem wire The picture is here
    https://www.google.co.in/search?q=wh...msg=NCSR&noj=1
    Normally you would have already have the filters when you get the modem connected by the ISP from your telephone wire. The main tele wire, gets to telephone , by the two way splitter, one wire directly connected to the telephone jack. The other is connected with two wires to pass thro the dsl filter to your modem. If you do not have, it get it from leading electrical shop or electronic shop or service provider

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    Ok thanks, jraju

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    HI abanerji , your modem statics show that your SNR value is very low.. near 6 dB. A healthy Broadband line should have minimum 15 dB SNR value and attenuation value should be belw 35dB. So that's why your ADSL is not stable and your net is down. For this plz contact your nearest BSNL exch. they will check and can improve your line's SNR value.

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    Default My query has now moved to "DSL filter"

    mayihelpu, thanks for taking the time to post.

    The disease is known :-) ... essentially, clash between digital broadband and analog phone. The frequencies of these two are in entirely different range.
    I did not know all this, only in the last few weeks have been enlightened, courtesy internet.

    Was advised to get a "DSL filter" to put between the splitter and the phone instrument. No such device is available in the local market.
    So, when using broadband for uninterrupted work, I physically disconnect the phone ... and broadband works much better.

    With all respect to the local BSNL technician, he is not very knowledgeable about such nuances.

    Quote Originally Posted by mayihelpu View Post
    HI abanerji , your modem statics show that your SNR value is very low.. near 6 dB. A healthy Broadband line should have minimum 15 dB SNR value and attenuation value should be belw 35dB. So that's why your ADSL is not stable and your net is down. For this plz contact your nearest BSNL exch. they will check and can improve your line's SNR value.

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    Hi, I told you so, in my post about DSL Filter. It is available in electrical shop. It normally comes with the modem pack. It would have been already available in your system.
    If not, go to the service provider, he will be helpful in getting the DSL filter. It is nothing but, a kind of small box, having one jack connecting the modem, and two jacks at the other end , connecting double way switch. Double way switch,or jack is to divert the main line to telephone and other to modem. Having the DSL filter helps in streamlining the sound to modem when both are in use. do you mean to say, that you do not have double filter and you directly connect with one main wire to both the tp and modem? Do not think so.

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    Hi jraju, clarifications below.

    a) Where I stay, none of the "big" electrical shops seem to know anything about DSL filter!

    b) The D-link router came without DSL filter.

    c) Sorry to repeat, BSNL service here is friendly, but "not so professional" :-) ... I have already drawn a blank from the exchange people (including lineman, and some "seniors").
    Even an acquaintance in one of the BSNL metros could not guide. My only thing pending is a visit to BSNL state head office, and get hold of a proper telecom engineer. I have kept it in abeyance, as long as my home-grown solution (disconnecting phone) is giving me result. Who anyway needs a landphone to talk now?

    d) My connection to BSNL line from the wall is through the conventional plain vanilla splitter. The "out" from the splitter goes one to the phone, and the other to the router.

    e) If I can get a DSL filter from one of the bigger markets in the metros, through somebody, I shall do that. Till then, the issue is managed now ... if not perfectly resolved.

    I leave this here.
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    Splitters are not normally supplied with new routers, you will only find them with modems.

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    My router came standalone, without "splitter" or "DSL filter". I bought a splitter off-the-shelf, when the old splitter died.

    I am just looking for a "DSL filter" now.

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    DSL filter and splitter are one and the same thing. You can buy one from Amazon or Flipkart or at one of your local shops.

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    Splitter would have an extra outlet for phone and stand alone filter only has one outlet for adsl. They are meant to do the same thing so if youve got one of these you are good.

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    I am still wary of e-shopping :-) ... I would buy electronics only from my "old trusted corner shop", or get through "trusted friend".

    I was forced to do a little internet study about my issue during the past few weeks. Not being a techie, but with some common sense (as I believe), I learnt that "DSL filter" may or may not be built into splitter. As I mentioned in my earlier post, I have a plain vanilla splitter (barebones, with practically nothing else inside it).

    Most probably, if I cannot get a standalone DSL filter, I will have to invest in a better quality splitter which may have DSL filter built in.

    Some knowledge I got from this http://www.dslreports.com/faq/12010

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    A splitter would normally have two outlets with dsl written on one and phone written on the other and if thats what you have got its all you need. Splitter without anything inside is understandable if someone is trying to connect two phones on one line but when we are dealing with a adsl connection we would technically call it adsl splitter but generally speaking when some one says splitter thats what they mean.

    I have been using Amazon and flipkart for a long time now and buy a lot of stuff provided reviews of customers are good and seller has a above 95% positive feedback. You can always return if the product is not upto the mark.

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    Default Thanks, Admin!

    Anyway, my ground reality is, with the phone physically disconnected, my broadband works better. That is more important to me, than any technical reasoning!
    In fact, the BSNL guy had suggested this step to "improve" broadband :-)

    Yes, I am aware of Amazon terms of business ... who would not know after their bombarding ads on tv! Just that I decide on the way I am comfortable shopping, physically or virtually.

    Quote Originally Posted by Admin View Post
    A splitter would normally have two outlets with dsl written on one and phone written on the other and if thats what you have got its all you need. Splitter without anything inside is understandable if someone is trying to connect two phones on one line but when we are dealing with a adsl connection we would technically call it adsl splitter but generally speaking when some one says splitter thats what they mean.

    I have been using Amazon and flipkart for a long time now and buy a lot of stuff provided reviews of customers are good and seller has a above 95% positive feedback. You can always return if the product is not upto the mark.
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    Quote Originally Posted by abanerji View Post
    Anyway, my ground reality is, with the phone physically disconnected, my broadband works better. That is more important to me, than any technical reasoning!
    In fact, the BSNL guy had suggested this step to "improve" broadband :-)

    Yes, I am aware of Amazon terms of business ... who would not know after their bombarding ads on tv! Just that I decide on the way I am comfortable shopping, physically or virtually.
    Hi, so in the end, your problem is resolved. It is not what you talk over telephone. Somebody may be contacting thro telephone . One think.
    Buying a splitter from amazon is not a huge cost. It may be available for less than 100 rupees. You could easily pick the one from my link or go to amazon. It is that much easy, you need not spend anything more than the amount speicified. Buying big things from amazon involve scrutiny and not tiny things like splitter. Do you have a double way switch box , when the outer line connects with two jacks at the back. The one goes to telephone and the other goes to the modem via splitter. Here, the sound wave and data wave get split.
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