Thread: Which mode is ur modem in : ADSL2+ or G.Dmt?

Which mode have you set your modem to ADSL2+ or G.Dmt? I have UTstarcom WA3002G4(type 4). I changed the mode to G.Dmt from ADSL2+. I saw 2 db improvement in downstream SNR value after saving settings. When I manually switched off the modem and switched it back on the mode had reverted to ADSL2+. Is this a fault in the modem or a fault in this model of utstarcom. Are u experiencing this? By the way my upstream SNR value is always above 23 db and is greater than my downstream SNR value. Is it fine?

The reason why you see the modem switch back to ADSL2 after switching off and on is because previously you changed the mode to G.dmt and clicked on 'Apply' button. This does not save the configuration to the flash memory. You must 'Save and Reboot' modem for permanent effect of any configuration change.

Which mode is ur modem in?

Please answer my other questions also.

G.dmt. But ADSL2+ works for me also. I did not find much difference. whitestar_999 is an expert in these things and he advised G.dmt to me.

some types of modems don't work as well with ADSL2/2+ mode as they with G.dmt mode because BSNL network uses G.dmt mode as default so to be safe it is recommended that you use G.dmt mode.

Right now my downstream SNR margin is 20 dB with ADSL2+. I am happy with it. But most of the time it varies a lot between 10 - 17. maybe because most of the neighbours have BSNL broadband. Should I switch to G.Dmt when my downstream SNR margin is low around 10-15?

I use ASDL2+ in my modem. I don't have any problem with it(yet).

try G.dmt first.only change it if you experience some problem.if currently no problem then you can keep any mode you want.

harsham, i think v have discussed this issue before.
I m using Utstarcom UT300-R2U, provided by mtnl.
BSNL also provides same model.
When u change ur mode to G.DMT, u'll have to go to ADVANCED tab and click on SAVE ROUTER SETTINGS TO FLASH, then a screen will open which will show YOUR MODEM IS REBOOTING, U'LL BE REDIRECTED TO PREVIOUS PAGE, PLEASE WAIT.
Dont close the window or do anything, until fresh window appears.
This is the same window when we type 192.168.1.1 in address bar.

Also G.DMT mode is prone to CRC errors( CRC= Cyclic redundancy check)
http://en.wikipedia.org/wiki/Cyclic_redundancy_check
So ur speed will be reduced little bit, but it'll provide greater stablity to connection compared to ADSL or ADSL2+, u've to decide which one is more suitable for u, U'll learn this after trial and errors.
Try T143 also,
BEST OF LUCK!

yep.. adsl 2+ is the preffered and more advanced mode.. with better allocation of bands but it will suffer problums and disconnections if used over longer distances... basically adsl 2+ will give you more bandwidth like in ranges of 20+mbps and gdmt more like 10+mbps . but as bsnl is always capped at 2 or 8 mbps.. gdmt effectively offers all its customers all the bandwidth they need at more stable speeds.

thanks chinmay. these are my new values.


Mode: G.DMT
Type: Fast
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 20.9 23.0
Attenuation (dB): 40.0 18.0

downstream Attn is a bit high but you should still be able to get normal speeds.i get normal speeds at Attn 35.

In my case, G.DMT gives me lesser line attenuation but SNR also decreases.
I m happy with ADSL2+

For me G.DMT works best...

Downstream Upstream

SNR Margin 41.0 13.0 db

Line Attenuation 19.0 20.0 db

Data Rate 2048 512 kbps

Awesome line stats mad, u'll absolutely have no probs if u upgrade with BSNL 8 mbps plan!:rockon:

Can someone tell me how to change to G.DMT my snr values are as low as 6.7

Read my post on previous page.

go to advanced and then click on DSL/ADSL, untick all options except Annexl, G.DMT, and bitswap. U can untick G.lite, T1.413, ADSL2, ADSL2+, AnnexM.
Thanks whitestar for providing me with the info.

Ok done thank you...all

i changed to g.dmt but still the values are as below....
SNR Margin (dB): 6.9 20.0
Attenuation (dB): 41.0 23.0

You should get telephone line checked immediately by bsnl. Btw r u facing internet disconnections?

I have not faced any disconnections...My speeds are also as expected...

@guru,
How far u r from NIB server?
Because as per ur line stats either u must b staying in villeges faar faar away from city or u must have parallel connections in ur house!

Originally Posted by Chinmay

,
How far u r from NIB server?
Because as per ur line stats either u must b staying in villeges faar faar away from city or u must have parallel connections in ur house!

Now how do i know where is the NIB server??..hehe i am definitely not in a village,i live in a city called mysore....my house is about 3-5kms from the nearest exchange though..

Chk this out..
http://speedtest.dataone.in:83/bandw...128&recorded=1

don't be confused friend.NIB server does not have anything to do with your problem.i think member chinmay meant local exchange which according to you is 3-5 Kms away which is completely normal for a big city like Mysore.distance mainly affects Attn values & even at a value ~40 you will get normal speeds.the problem is low SNR value in your case which must be above 10 for smooth connection but if you are having no problems then no need for extra efforts but keep this information in mind for future.

Originally Posted by Chinmay

Awesome line stats mad, u'll absolutely have no probs if u upgrade with BSNL 8 mbps plan!:rockon:

Thanx for the information Chinmay...Might upgrade in future...