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

My SNR margin varies. it is generally 7.1 downstram and 19 upstram. attenuation is 21.5(500 combo--speed Upto 2 MBPS plan). But when it rains, it goes don and starts to disconnect. What should I do? sometimes I get SNR of 14 when its not raining. So I think rain is the culprit. What will I do in monsoon yaar!

Originally Posted by appy.djuetce

My SNR margin varies. it is generally 7.1 downstram and 19 upstram. attenuation is 21.5(500 combo--speed Upto 2 MBPS plan). But when it rains, it goes don and starts to disconnect. What should I do? sometimes I get SNR of 14 when its not raining. So I think rain is the culprit. What will I do in monsoon yaar!

Mention your modem model and make.
Check all contacts for oxidisation /high resistance contacts /blackening
Use short cables.
Change MOd mode to GDMT. Uncheck adsl2 +
Check SNR/ATTN when it rains.
Hasty conclusion.
SNR will increase and ATTN will reduce !!

When looking at Line Attentuation & SNR Margin we should always look at the Downstream data for Download & Upstream for upload individually, right ?

OR

Does the Downstream data has any influence on the Upstream data or vice versa ?

Correct the first time. For ADSL technology, downstream and upstream rates are independent. That is what A (Asynchronous) in ADSL stands for.

Originally Posted by just4kix

Correct the first time. For ADSL technology, downstream and upstream rates are independent. That is what A (Asynchronous) in ADSL stands for.

hey just4kix!
does SNR margin affect speed????
my snr magin: 32.6 13.3
r they right for 200+ speeds?

SNR Margin and line attenuation do not affect speed, at least directly. They affect connectivity and up time.

Originally Posted by just4kix

SNR Margin and line attenuation do not affect speed, at least directly. They affect connectivity and up time.

plz answer my question 2-

my snr value- 32.6 13.3

are these good??

Originally Posted by imrock

plz answer my question 2-

my snr value- 32.6 13.3

are these good??

Have you read post # 1?

Originally Posted by just4kix

Have you read post # 1?

i read.
is it for only downloadstreaming or upstreaming also?

Originally Posted by imrock

does SNR margin affect speed????
my snr magin: 32.6 13.3
r they right for 200+ speeds?

Just go through the image link given here, you will come to know how SNR Margin and Line Attenuation affects things.

SNR Margin and Line Attenuation

Here's my SNR & attenuation :

Remote Line Attn 12.0 dB
Remote SNRMargin 29.0 dB

I think its quite strong. I am already getting 3-4 Mbps speed on upto 2 Mbps plan (Home 250)

Originally Posted by anuj

Here's my SNR & attenuation :

Remote Line Attn 12.0 dB
Remote SNRMargin 29.0 dB

I think its quite strong. I am already getting 3-4 Mbps speed on upto 2 Mbps plan (Home 250)

Ho so you are getting more speed than what is being provided that's great

Originally Posted by anuj

Here's my SNR & attenuation :

Remote Line Attn 12.0 dB
Remote SNRMargin 29.0 dB

I think its quite strong. I am already getting 3-4 Mbps speed on upto 2 Mbps plan (Home 250)

do u mean Mbps or MBps
there's a lot difference between Mbps and MBps.

b=bit
B=byte

1byte=8bits

so what do u really get???

Nope, I do get 3/4/5 Mbps (not MBps) but it never falls below than 2.5 Mbps.
While downloading, I get speed of around 400KB/sec.

Originally Posted by anuj

Nope, I do get 3/4/5 Mbps (not MBps) but it never falls below than 2.5 Mbps.
While downloading, I get speed of around 400KB/sec.

Then also it is more than provided.
enjoy fully what u got.
i wish i get that much speed.
the BSNL guys just say that ur pc is infected with virus

Oppsss.....Lets not go offtopic.

Originally Posted by imrock

Then also it is more than provided.
enjoy fully what u got.
i wish i get that much speed.
the BSNL guys just say that ur pc is infected with virus

Oppsss.....Lets not go offtopic.

I guess reason behind that is telephone exchange is just 500-600 Meter away from my home.

Just 2 minutes back, I took test & here's result is:



Speed is lowered now but I am quite sure that it 'll back to 4 Mbps after 10 PM.

BSNL guys 'll say whatever come in mind like virus & all that. But it actually depends on their work like porting, health of equipments at exchange. My relative (comes within same exchange of mine) also get more than promised speed on his plan & thats why I actually opted to BSNL thinking I might get same. Yeah.. I am getting it!

@anuj

Can you post the shot of you ADSL Statistics page from your modem.

@anuj
Please test your speed here also.
Airtel

Originally Posted by essbebe

@anuj
Please test your speed here also.
Airtel

Tested 2 times. Both the times, it showed 3.05 Mbps speed. Attaching the screen shot:




Speedtest.net result showing same speed. Its again back to 3-4 Mbps range as I predicted.

Originally Posted by deepmohan

@anuj

Can you post the shot of you ADSL Statistics page from your modem.

No problem! But the statistic page of my modem is too long. I was only able to take screen shot of limited area. I hope it contains statistic you require. If anything else, I can post.

your stats screen shot has only snr and attenuation values, i required Downstream Rate (Kbps):

Originally Posted by deepmohan

your stats screen shot has only snr and attenuation values, i required Downstream Rate (Kbps):

Ok, wait for few minutes. I'll back with screen shot of required page..


Here it is:

@anuj
Thanks. Airtel uses about 2.6 MB of data
Speedtest each server test will need about 15 MB.
This info is for users without free NU plan.
seems Airtel test is also reliable.

PS: Please reduce the size of pictures as small as possible, , but just readable. and fits the present page.

Originally Posted by essbebe

@anuj
Thanks. Airtel uses about 2.6 MB of data
Speedtest each server test will need about 15 MB.
This info is for users without free NU plan.
seems Airtel test is also reliable.

PS: Please reduce the size of pictures as small as possible, , but just readable. and fits the present page.

Yes, I have idea about this. But I have to consume my 1GB free limit within next 5-6 days. So I am not worrying about that!

PS: 'll take your advice granted now onwards. Sorry for inconvenience as of now.

BTW what you think about screen shot I have posted just now?
What should be downstream/upstream rate usually?

PS: screen shot size reduced.

@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.

Yes, I have idea about this. But I have to consume my 1GB free limit within next 5-6 days. So I am not worrying about that!

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.