India Broadband Forum
how to increase SNR
This is a discussion on how to increase SNR within the BSNL broadband forums, part of the Broadband Internet Service Providers category; From Post No 19. using a splitter at modem end would be useless as a splitter is a typical 3.5KHz ...
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02-20-09, 08:24 AM
| #21 | |
| Platinum Member Join Date: Aug 2007 Location: Chennai
Posts: 4,246
Rep Power: 12   |  From Post No 19. Quote:
SEE http://i34.tinypic.com/s4c0me.jpg From the Telephone junction the RJ11 short cable can go the modemDIRECT without any filters so that there is no attenuation/degradation of the signal. An Adsl splitter does just this. ( see diagram above) Due to DC present in the line, the surge affects the modem connection, when the handset is lifted or there is an incoming call. Better Idea will be to have a telephone number dedicated to BB and another for incoming and outgoing calls. Some Home Plans have no telephone rental. There is also some limit ( seems 5 telephones) that can be connected in BB ADSL connection line. ( Impedance matching) @Noisysilence Pictures can be attached as annexures. Click Go Advanced. links can be given hxxp or h t t p :// or just bbservice.bsnl.in | |
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02-20-09, 08:38 AM
| #22 |
| Amor vincit omnia | Wow. Thanks for that post. I was also of the impression that some kind of filtering is done in the splitter. Now i know that for ADSL purposes no filtering is done, but it is done only for the phone purposes.. Repped for the informative post.. |
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02-20-09, 08:49 AM
| #23 | |
| Platinum Member Join Date: Aug 2007 Location: Chennai
Posts: 4,246
Rep Power: 12 | Quote:
@cool_techie_tvm I think this topic was discussed threadbare somewhere else. Anyway trying a different modem CAN improve/DEGRADE SNR/ATTN also . I found AIRTEL connection better,.I.R.O snr/attn. even though BSNL Exchange is very near .(usual oxidisation/rusting/blackening of contacts due to proximity to sea . FLASH Advance congratulations for being No 1 in the contest | |
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02-20-09, 10:36 AM
| #24 |
| Silver Member Join Date: Apr 2008 Location: delhi Age: 23
Posts: 420
Rep Power: 2 | Hi!everyone ...... i ws just wondering are the values for SNR and attenuation of my modem good ...... ?? ....... actually i'm having a ZTE ZXDSL 831 AII modem ........... but there is visible two attenuation and SNR values under it ................... the values are listed below ............. Local SNRMargin 32.5 dB Local Line Attn 12.5 dB & Remote Line Attn 6.0 dB Remote SNRMargin 25.5 dB so which one among these above listed to check for .............. b'coz i'm still suffering from DC at random intervals ............. and for additional info i'm listing my downstream line rate and upstream line rate : - Downstream Line Rate 7997 kbps Upstream Line Rate 510 kbps |
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02-20-09, 10:51 AM
| #26 | |
| Silver Member Join Date: Apr 2008 Location: delhi Age: 23
Posts: 420
Rep Power: 2 | Quote:
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02-20-09, 11:03 AM
| #27 |
| Amor vincit omnia | Yes the values are proper. If u are still experiencing problems with your connection i would suggest contacting the exchange for a free test modem and checking the stability of the connection with that modem too.. |
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02-20-09, 11:14 AM
| #28 | |
| Silver Member Join Date: Apr 2008 Location: delhi Age: 23
Posts: 420
Rep Power: 2 | Quote:
 ............. i mean does it show some additional info about the line as well ........ ?? ............... b'coz i had complained about it to the local exchange office about the problem but (after continues chasing) they simply replaced my modem ............ but of no use as still the DC occurs  ..... and while they had come to my house it was wrking fine that day  ............. | |
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02-20-09, 11:28 AM
| #29 |
| Amor vincit omnia | The line info displayed varies in between the modems of different make. The most comprehensive line details are listed by UTStar 300 R2 and 300 R2U (with BSNL's custom firmware). The same is being listed by one of the Beetel modem too (i am unsure of the correct model). It is tough to convince the BSNL officials when the problem is intermittent. |
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02-20-09, 10:18 PM
| #30 |
| Platinum Member Join Date: Feb 2008
Posts: 2,692
Rep Power: 5 | ensure that all your telephones are connected after the splitter disconnect telephones temporarily and then restart router, if there are no more disconnections, then you need to check your splitter.. |
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02-20-09, 10:38 PM
| #31 |
| Junior Member Join Date: Jan 2009
Posts: 33
Rep Power: 1 | Hi guys, I think I belong to this category. I had earlier tried all methods, changed the wires to check if something might improve. Cleared the wire rust at the junction. Our lineman was not able to really identify the problem, usually he only bothers if link glows or not, there ends his job. I dont know what to do to improve the situation. Surprisingly I got speeds from 1 - 1.5mbps suddenly even today it happened. A new mystery !!  yup its true. Then I tried to reconnect, well the speeds started decreasing on and on till 450Kbps. So what is this new phenomenon. Why is that I am not getting a consistent speed. I have been with this trouble for the past 2 and half months, yet unresolved.For downlink My attenuation : always >44.5dB My SNR values from 11-13dB I tried different modes. I swapped modems and checked and my modem is a bit slow than the newer versions. Its Smart MT882. Can someone pls help me out guys....  |
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02-20-09, 10:45 PM
| #32 |
| Amor vincit omnia | Do u know the appropriate distance of the modem from the exchange? Use ::. Kitz - Max speed calculator .:: please. Just enter the attenuation value in the box and click on calculate button.. |
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02-21-09, 04:33 AM
| #33 | |
| Junior Member  Join Date: Feb 2009 Location: Rajkot, Gujarat Age: 23
Posts: 15
Rep Power: 1  |  From post#20 Quote:
Max(Kbps): 15356/1036 Rate (Kbps): 7996/509 Max: Maximum attainable rate varies around 15k+ kpbs(down) and 1k+ kbps(up+ Rate: The actual rate which is fixed at 7996 kbps(down) and 509(up).... | |
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02-21-09, 09:09 AM
| #34 |
| Platinum Member Join Date: Aug 2007 Location: Chennai
Posts: 4,246
Rep Power: 12 | @Noisysilence Appears your Mod is adsl2 + Uncheck this option. Try GDMT T413 Glite bitswap enabled. Check for stable connection. Report SNR and ATTN data. Mention modem/router model/make. |
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02-22-09, 12:12 AM
| #35 |
| Platinum Member Join Date: Feb 2008
Posts: 2,692
Rep Power: 5 | @noisysilence do you use iptv? |
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02-22-09, 01:27 PM
| #37 |
| Junior Member Join Date: Feb 2009
Posts: 1
Rep Power: 0 | Guys, I am using the 256 Kbps unlimited plan and am seeing these values: SNR Margin (dB): 6.7 12.6 Attenuation (dB): 49.5 29.0 Yesterday I experienced lots of problems with the DSL link. Can there be a problem other than the line which is causing the DSL link to go down frequently? |
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02-22-09, 05:18 PM
| #38 | ||
| Junior Member Join Date: Feb 2009 Location: Rajkot, Gujarat Age: 23
Posts: 15
Rep Power: 1 | Quote:
Modem: ZXDSL 531B hxxp://i43.tinypic.com/154k2o1.png And the line details as you asked... hxxp://i43.tinypic.com/1ysi2s.png hxxp://i42.tinypic.com/126dzps.png Please replace "xx" with "tt" Quote:
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02-22-09, 10:09 PM
| #39 |
| Platinum Member Join Date: Feb 2008
Posts: 2,692
Rep Power: 5 | nice.. and you still have a good downstream!! |
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03-06-09, 03:04 PM
| #40 | |
| Junior Member Join Date: Feb 2009 Location: Hyderabad, India. Age: 63
Posts: 82
Rep Power: 1 | Quote:
It dependson that. Then perhaps on copper cable condition and you can know it by the noise you get on the phone. if it is Noisy (after splitter and excluding left over modem noise), then you can complain to the local SDOP with a copy of these readings attached. aslo inform the case number you can get from 1800 424 1600 | |
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| increase, snr |
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