India Broadband Forum

jon08 · 01-26-09, 04:07 PM

I use Dlink GLB-502T ADSL+2 Router cum modem. what is my SNR value in attachment picture? my speed is very very slow. pls help me.

just4kix · 01-26-09, 04:19 PM

In your case the DS Margin is SNR Downstream Margin and US Margin is SNR Upstream margin.

You SNR is 13 db (down) and 2 db (Up). These are very low. You will face problems - read this article: SNR Margin and Line Attenuation - What do they mean?

aray · 01-26-09, 06:30 PM

Thanks for the details. It helped me also to know more about the SNR.

essbebe · 01-26-09, 11:53 PM

1.If you can change the Trained modulation to
GDMT
SNR will increase slightly, and a
stable connection, also may be possible.

2. Are you using an external ADSL splitter to connect to the modem ?
( Appears not necessary for GLB502T confirm. )

3. For low speed:
Please try opendns 208.67.220.220 and 208.67.222.222

Para two: SNR Signal to Noise Ratio.
Excellent article given by @just4kix.
Example: For A TV station reception we use a directional beam Antenna( Olden days ! ONLY DD!)
If your picture is fussy SNR is low meaning wanted signal is low and Noise high. .

Reorient the antenna and we get a clear picture.
SNR value increases. ( Also for Portable FM Radio)

Same way for BB data signals/.
Line loss/connection contacts/distance from exchange etc affects your BB connection.

For reference :
DLINK GLB-502T ADSL2+ Router configuration for BSNL dataone | I am Sumeet
DLINK India's user manual>
D

jon08 · 01-27-09, 05:23 PM

Thanks a lot to all ............

Quote:

Originally Posted by essbebe

1.If you can change the Trained modulation to
GDMT
SNR will increase slightly, and a
stable connection, also may be possible.

2. Are you using an external ADSL splitter to connect to the modem ?
( Appears not necessary for GLB502T confirm. )

3. For low speed:
Please try opendns 208.67.220.220 and 208.67.222.222

Para two: SNR Signal to Noise Ratio.
Excellent article given by @just4kix.
Example: For A TV station reception we use a directional beam Antenna( Olden days ! ONLY DD!)
If your picture is fussy SNR is low meaning wanted signal is low and Noise high. .

Reorient the antenna and we get a clear picture.
SNR value increases. ( Also for Portable FM Radio)

Same way for BB data signals/.
Line loss/connection contacts/distance from exchange etc affects your BB connection.

For reference :
DLINK GLB-502T ADSL2+ Router configuration for BSNL dataone | I am Sumeet
DLINK India's user manual>
D

How to i change Trained Modulation ADSL_2plus to GDMT. Help me pls!!!!!!!

cool_techie_tvm · 01-27-09, 06:15 PM

Quote:

Originally Posted by jon08

How to i change Trained Modulation ADSL_2plus to GDMT. Help me pls!!!!!!!

Are u able to log into the web interface of the modem/router? It can be accessed by typing 192.168.1.1 on the browser address bar. Once u login, look closely at the various tabs being listed in the page. U should specifically check for ADSL Modulation/DSL Modulation and in that option u will be able to select the adsl modulation required (from ADSL2+ to G.DMT).

jon08 · 01-27-09, 06:32 PM

Quote:

Originally Posted by cool_techie_tvm

Are u able to log into the web interface of the modem/router? It can be accessed by typing 192.168.1.1 on the browser address bar. Once u login, look closely at the various tabs being listed in the page. U should specifically check for ADSL Modulation/DSL Modulation and in that option u will be able to select the adsl modulation required (from ADSL2+ to G.DMT).

I use DLINK GLB-502T router cum modem. I search every page in 192.168
.1.1 address page but nothing see about Trained Modulation .

cool_techie_tvm · 01-27-09, 07:56 PM

Quote:

Originally Posted by jon08

I use DLINK GLB-502T router cum modem. I search every page in 192.168
.1.1 address page but nothing see about Trained Modulation .

Go to Setup-->Modem. Any of the modes can be set in there.

jon08 · 01-31-09, 09:07 PM

Quote:

Originally Posted by essbebe

1.If you can change the Trained modulation to
GDMT
SNR will increase slightly, and a
stable connection, also may be possible.

2. Are you using an external ADSL splitter to connect to the modem ?
( Appears not necessary for GLB502T confirm. )

3. For low speed:
Please try opendns 208.67.220.220 and 208.67.222.222

Para two: SNR Signal to Noise Ratio.
Excellent article given by @just4kix.
Example: For A TV station reception we use a directional beam Antenna( Olden days ! ONLY DD!)
If your picture is fussy SNR is low meaning wanted signal is low and Noise high. .

Reorient the antenna and we get a clear picture.
SNR value increases. ( Also for Portable FM Radio)

Same way for BB data signals/.
Line loss/connection contacts/distance from exchange etc affects your BB connection.

For reference :
DLINK GLB-502T ADSL2+ Router configuration for BSNL dataone | I am Sumeet
DLINK India's user manual>
D

MANY MANY THANKS TO essbebe. I change my Trained modulation to GDMT. Now its works fine.......

essbebe · 01-31-09, 11:43 PM

Quote:

I change my Trained modulation to GDMT. Now its works fine.......

Please post latest SNR details. screen shot as annexure.
Also WHERE you changed the mod to GDMT. in modem.

jon08 · 02-01-09, 09:49 PM

Quote:

Originally Posted by cool_techie_tvm

Go to Setup-->Modem. Any of the modes can be set in there.

Thanks. i change my modulation.

jon08 · 02-01-09, 10:12 PM

Quote:

Originally Posted by essbebe

Please post latest SNR details. screen shot as annexure.
Also WHERE you changed the mod to GDMT. in modem.

I attached two screen shot.......

01-26-09, 11:53 PM	#4
essbebe Platinum Member Join Date: Aug 2007 Location: Chennai Posts: 4,240 Rep Power: 12	1.If you can change the Trained modulation to GDMT SNR will increase slightly, and a stable connection, also may be possible. 2. Are you using an external ADSL splitter to connect to the modem ? ( Appears not necessary for GLB502T confirm. ) 3. For low speed: Please try opendns 208.67.220.220 and 208.67.222.222 Para two: SNR Signal to Noise Ratio. Excellent article given by @just4kix. Example: For A TV station reception we use a directional beam Antenna( Olden days ! ONLY DD!) If your picture is fussy SNR is low meaning wanted signal is low and Noise high. . Reorient the antenna and we get a clear picture. SNR value increases. ( Also for Portable FM Radio) Same way for BB data signals/. Line loss/connection contacts/distance from exchange etc affects your BB connection. For reference : DLINK GLB-502T ADSL2+ Router configuration for BSNL dataone \| I am Sumeet DLINK India's user manual> D Last edited by essbebe; 01-27-09 at 12:17 AM.

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India Broadband Forum

Pls help me, find what's my SNR value

Pls help me, find what's my SNR value

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01-26-09, 04:19 PM	#2
just4kix Platinum Member Join Date: Dec 2007 Location: Pune Posts: 8,899 Blog Entries: 6 Rep Power: 19	In your case the DS Margin is SNR Downstream Margin and US Margin is SNR Upstream margin. You SNR is 13 db (down) and 2 db (Up). These are very low. You will face problems - read this article: SNR Margin and Line Attenuation - What do they mean?

01-26-09, 06:30 PM	#3
aray Junior Member Join Date: Jul 2008 Location: Kolkata Posts: 31 Rep Power: 2	Thanks for the details. It helped me also to know more about the SNR.