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[InkTone]

i have not seen a decrease in speed with different range of ip. i get 4 mbps always.
now bsnl uses ADSL 2+ technology which supports speed upto 24 mbps. this technology is used so that the service can be used to long distance users.
this 1.5 km is the range to which the full power of adsl2+ can be utilised. so what ever mode you select, as the distance between user and the exchange increases there will be decrease in speed.
refer to this graph to make things clear.

Now as far as i know Gdmt is used for long distance connection to get a more stable connection.but i think that wont give higher speed.
regarding the speed in different time. actually that is due to the load the line takes. the BSNL engineer told me about it.
server issues comes during that time i found SNR getting reducing,pages wont load properly, many errors and stuff like that but even when that is resolved the DL/UL rates always fluctuates.
Hope this helps you clear something.

 

[rajujayaraman]

HI, excellent piece of information . So, one need to only enable adsl2+ and uncheck all the other things inclulding annex settings to get the maximum possible download speed with all troubles of fluctuations in speed. If you say, so, i will just enable adsl2+ and leave at that.
, Ink.Waiting for a final reply from you
We only see the wires on our premises, but as you say, there may be so many joints , so many patches, so much other factors that will have impact on the download speed like snr, line attenuation etc.
as you say, this value changes overtime, one gets the speed according to the distance one is away from the exchange.

 

[InkTone]

as far as i know the best possible mode is selected by modem itself.
i have these all enabled by default
G.Dmt Enabled
G.lite Enabled
T1.413 Enabled
ADSL2 Enabled
AnnexL Enabled
ADSL2+ Enabled

but then too my modem mode is shown as ADSSL2+. i have heard that the D.DMT is adviced when one have a non stable connection.
as far as i know the main reason if all wiring done is right is SNR. SNR the noise ratio impact so much in connection. This value changes with the type of wire used,distance from user to the exchange,the pair used,a faulty modem,splitter,adapter,earth leakage in the line, now even other electrical appliances that are working in the premise, many such factors affect SNR. coaxial cables are able to provide more speed connection as it has better insulation, see how thick the copper is in it.
all these telephone lines that are laying underground on public roads may be damaged during digging works, some may extend when pulled with JCB's etc these all affect the performance of the line.

Note, i am not an expert. saying these from experience, reading from different sources and talking with BSNL engineers in my location.

 

[ijsa]

Select ADSL 2+ with Annex. M..... if you have good line stats you will get 20Mbps + D/L.... deselect all other modualtions.
For bad line stats G.DMT works best Annex. L...

Check MTNL forum.... you will get lot of feedback.....

 

[rajujayaraman]

Hi, ijsa please give the link in the MTNL
I am not getting that speed .
I have only enabled adsl2+ with annaxe.
My stat is good as can be seen from the below lines
Ijsa, the annex M is more on upstream and not on downstream
adsl2+ with annax L , so is the maximum possible speed.
annex M does not work for old tlype of bsnl modem, like terracom tdsl300w2.
How many users know this type of adsl modulation details
More over, the upstream is capped in adsl as the name itself suggests aslymmetrical.
Bsnl does not give the user desired upstream in broadband unlike the other firble plans
Are you near the dslam .
expecting reply
line stat:
Downstream Upstream
Hlin Scale33480
Loop Attenuation(dB)30.919.3
Signal Attenuation(dB)30.918.7
SNR Margin(dB)6.46.4
Attainable Rate(Kbps)117721143
Output Power(dBm)20.412.0

Adsl Tone List
Adsl Line StatusSHOWTIME.L0
Adsl ModeADSL2+
Channel ModeInterleave
Up Stream621 kbps
Down Stream10493 kbps
Attenuation Down Stream30
Attenuation Up Stream19
SNR Margin Down Stream6.2
SNR Margin Up Stream20.9
Vendor IDRETK
Firmware Version4926e708
CRC Errors795
Up Stream BER0e-7
Down Stream BER134e-7
Up Output Power12
Down Output Power19
ES360
SES43
UAS2480
snr margin fluctuates and not steady

​

 

[ijsa]

your line stats are bad..... SNR below 10 and Attenuation above 30.....

I had good line stats... SNR above 40 and Attenuation below 10 when I had MTNL (surrenderd few years ago...... was 500mtrs from exchange.)..... get your line checked... if required get your wire replaced.


MTNL forum

 

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[rajujayaraman]

Hi, i had my wire replace only recently.
Do yu have direct connection of your main line to modem directly or with splitter?
My snr fluctuates widely always .
I had the port change option also after trying port reset.
If all else fais, then how to get the best snr
Sometimes i get 10 mbps and some times less than 6 in and around 5.5
please say the tricks
of course, i could hear a ringtone with grrr always in the back ground.
Port change means , a kind of line change is it not ijsi
Today morning i am having 10 mbps and now i have only 5 mbps what wouold have caused to sudden ups and downs

 

[ijsa]

Do you have internal wiring or the wire goes straight in to splitter or modem.

I used to have a splitter first then to modem and telephone.

what is the distance of your house from exchange?

unless you get good attenuation your speeds won't be good and stable.

the below stats are from not so good mtnl line. but still you see SNR around 30

-- dead tinypic image removed --

 

[InkTone]

@ijsa in your screenshot the data rate shown is 2mbps right. so one can expect that kind of SNR. but now that case are all gone. instead of 2 its 8,10,20 mbps and that will affect SNR

@rajujayaraman one thing to do now is to change the pair. are you saying about that or the drop wire from DP to your splitter.
the splitter lets you use phone and internet at the same time.try to get a modem from your friend and check how the net performs..

 

[rajujayaraman]

Hi, i use telephone and modem. The distance is about 2.2 kmetres. But with Adsl2+, getting as low as 6 snr is puzzling. I get a static grrr along with the regualr bsnl usual tone.
When Bsnl staff informed me of port change, i was getting a clear tone, but once i hung up and re pick up, the grr tone added to it.
I tried with terracom modem also, and it also shows the same kind of result.
previously , i was having the connection by two way rosette box like below
connection
Now , i just use a single way rosette box from thee i use a rj11 jack to connect to the splitter. From splitter i use phone jack to phone and modem jack to modem and then to pc
I think this is also correct.
In the previous connection , on one end of the rosette wire connection, a wire was taken to the telephone and the other end of the jack connected by a rj11 wire to connect the other to the phone part of the splitter to get telephone connection. This was the default connection done by the field staff........