Thread: SNR Margin and Line Attenuation - What do they mean?

Originally Posted by deepmohan

@anuj

By mistake BSNL have set your port speed to 8 Mbps instead of 2 Mbps, because of that you are getting 3 to 4 Mbps speed.

Really?? How you concluded that? Is the downstream rate in modem page suggest that?

essbebe, put light on this please!

Originally Posted by essbebe

NEGATIVE
BSNL counts usage on monthly basis 1st to 30th/31st.

If you got the connection last mont around 8th your DEC quota is only 1024/30 x 22=
approx 750 MB!!!
Your usage month also changes .from 1st.
Chargeable units less 1 GB is excess usage.

Check usage Billed for Dec 2009.

I have opted in Nov 09 & it got started from 16 Nov 09. So I only got around 500 MB free in Nov. They billed correctly for that month. Rent was 125+tax for that month.

Dec 09 bill is not yet issued, atleast I don't get it as of today. But I guess from Dec, they 'll charge as per monthly cycle starting for 1st of every month. Following I'll have 1GB free usage this month. Correct me if wrong.

Yes . see the picture your posted.( 8187 kbps d/l)
We get two sets. normally.

maximum line speed ( modem's)
and line rate. D/L U/L this depends on ISP.
And actual(
conditions apply!

Originally Posted by essbebe

Yes . see the picture your posted.
We get two sets. normally.

maximum line speed ( modem's)
and line rate. D/L U/L this depends on ISP.
And actual(
conditions apply!

So it usually shows something around 2048 Kbps speed in modem configuration page for upto 2 Mbps plans?

I initially thought that 8187 Kbps shown in my modem page is default value & independent of actual plan.

examples:
http://i11.tinypic.com/2e5myb4.jpg
http://i21.tinypic.com/2njdq49.jpg

Originally Posted by essbebe

one example:
http://i11.tinypic.com/2e5myb4.jpg

Ya, got it now. So it seems I am bit lucky!
But I guess they 'll come to know about their mistake one day mainly if I change plan.

@ anuj
you are very lucky dude...i hope i could get that much of speed.
When i was using limited 2mbps plan i used to get speed between 1.8-2.0mbps & infact MTNL exchange is also very near to my house around 600-700 meters as it is in your case so it means the internet speed also depends on the line rate/port opened to you!

@ others
Recently i have switched to 512kbps unlimited plan, in the beginning i used to get good speed but recently i am getting only 260-270kbps. I checked my modem and it shows Download-stream as 288kbps & Upload-stream as 260kbps.
So it means they have decreased my line rate.....am i correct!!

take a look at this:

Change Mod mode to GDMT.
Your line conditions extremely bad.
Check for rusted /contacts/oxidization/blackening etc.
A new pair of short rj11 cables with new contacts may help.
seems you are far away from the Exchange .

What is the Down-stream & Up-stream Line Rate for the 512Kbps (Down/Up) internet connection!!
Currently mine is set at Down-stream is 576Kbps & Up-stream is 517Kbps by exchange!

SNR Margin (dB): 34.5 (Downstream) 27.0(Upstream)
Attenuation (dB): 24.5 (Downstream) 11.1(Upstream)


Router - Beetel 220BX, Plan - BSNL UL750

Even though the values of SNR Margin and Attenuation are good I still experience frequent hanging of the modem mostly while using uTorrent,

Meaning all 4 LED's are ON but the router is completely unresponsive(can't even ping and network activity is zero), I gave to restart the router and then things become OK,

This happens every 10-15mins,

Is there a problem in the router or splitter or anything else?

How to know or find out both.Very good post.Reps to the author

Originally Posted by bhasker

How to know or find out both.Very good post.Reps to the author

Go to http://192.168.1.1, enter username and password as admin, admin. then go to DSL STATUS to check it out.

Click this link http://192.168.1.1/

Enter both ID and password as admin. In some cases, password is password or root.

Thank you. Welcome to India Broadband Forum.

You can find the SNR Margin/Line Attenuation in the same page of the modem's summary pages. Different modems have different menus - so difficult to say.

BTW, how did you find us here? Please stay put and contribute.

giving you reps after reading the last sentence of ur article.

This is what was displayed.I cannot interpret the data.Can someone help me out.
Mode: ADSL2+
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 34.0 28.8
Attenuation (dB): 16.5 7.8
Output Power (dBm): 12.3 2.1
Attainable Rate (Kbps): 17267 1333
Rate (Kbps): 2045 509
MSGc (number of bytes in overhead channel message): 72 15
B (number of bytes in Mux Data Frame): 24 5
M (number of Mux Data Frames in FEC Data Frame): 1 8
T (Mux Data Frames over sync bytes): 2 8
R (number of check bytes in FEC Data Frame): 16 16
S (ratio of FEC over PMD Data Frame length): 0.4147 3.1801
L (number of bits in PMD Data Frame): 791 161
D (interleaver depth): 64 8
Delay (msec): 6 6

Super Frames: 277047 275960
Super Frame Errors: 0 55140
RS Words: 43219406 1255140
RS Correctable Errors: 18 2264183
RS Uncorrectable Errors: 0 N/A

HEC Errors: 0 328699
OCD Errors: 0 0
LCD Errors: 0 0
Total Cells: 21602853 2508376282
Data Cells: 1909037 1694878548
Bit Errors: 0 28989557

Total ES: 0 10617731
Total SES: 0 10599911
Total UAS: 17 10586984

The download speed has recently come down.

Thanks gaggan4392

This is all what there is to know:

Downstream Upstream
SNR Margin (dB): 34.0 28.8
Attenuation (dB): 16.5 7.8

Downstream means from ISP to your modem and upstream is vice versa.

I want to know whether the figures give good connection or not.Thanks for your reply friend.Can i help the forum in any way.

Please refer to post 1 of the thread. Everything is explained.

Thanks .Though i am a layman what i understood is the connection is good.Reps to you.

Originally Posted by bhasker

Can i help the forum in any way.

Yes. Certainly.

1. Ask questions however stupid they might seem. You will find that these simple (stupid) questions are not really stupid at all. They have profound theory and concept behind.

2. But before asking questions, please certainly do a Google search around. 95% of the time you will find the answer.

3. Keep participating. You said that you are a novice. Everyone starts as a novice. And everyone is a novice in some field or another. Slowly from a novice, you will become an expert.

4. Try to help. If you are not able to help people, just point to the right thread or person. People do appreciate this bit also (I tell this so often).

Rep added

Downstream Upstream
SNR Margin: 17.0 8.1 db
Line Attenuation:19.0 12.4 db
Data Rate: 6144 517 kbps

How are these results??

Originally Posted by mihir94

Rep added

Downstream Upstream
SNR Margin: 17.0 8.1 db
Line Attenuation:19.0 12.4 db
Data Rate: 6144 517 kbps

How are these results??

Thank you.

You SNR Margin is fair. Line attenuation is low and that is excellent. You should not be facing issues.

Originally Posted by just4kix

Thank you.

You SNR Margin is fair. Line attenuation is low and that is excellent. You should not be facing issues.

@moderator us right the values of your line are good,
"Frequent Disconnection"Issue may not be there,however In a month or two you may face drop down of "LINK"

Please look at this
I have BSNL 500c paln 2mbps getting 180-190KB/s in torrent and avg
210KB/s from megaupload is this good???????





Is this ok........bsnl server is 1/4 km away.