TP LINK TD-W8970 DSL Modulation Problem

[panzer008]

MTNL Mumbai Triband Plan: UL1333
Triband Speed: 1Mbps (8AM-8PM), 2Mbps (8PM-8AM)
ADSL connection speed 24*7: DL:2048kbps UL:512kbps
Old Router: Linksys WAG54G2 ADSL2+ (2009) (Latest Firmware Upgraded)
New Router: TP LINK TD-W8970 ADSL2+ (2013) (Latest Firmware Upgraded)

I had a Linksys WAG54G2 ADSL2+ router..... but upgraded to this W8970......
On the Linksys WAG54G2 I use to use ADSL2+ modulation and get 200-210KBps DL speeds(after 8PM) with ping to EU arnd 170ms(since my ping to MTNL itself is 60ms)........ with line stats:

Now on the TPLINK W8970 I am getting DL speeds capped to 140-141KBps and ping increased to 195ms to same EU servers with ADSL2+ modulation....... Why is this???...... Why is my speed getting capped??....... bcoz of which ping is also increasing....
Line stats r also very diff than the Linksys(but I think its router to router)......

But if I chg modulation on W8970 to G.dmt...... I get usual DL speeds of 200-210KBps and 170ms ping to EU..... but max attainable rate goes down frm 22700kbps to just 6300kbps...... which is not a concern now but if I want to upgrade to MTNL's new 8Mbps plan it will hamper my speeds then....... Line stats for G.dmt:

So the main question is why is the W8970 capping speed on ADSL2+ modulation??

P.S.: Over all the W8970 is very good router....... streaming HD movies across devices(PS3, OPlay HDP-R1) through gigabit ethernet gives no stutter........ with very good Wifi range throughout 2BHK...... and hasnt dropped ADSL connection so far........

 

[prateekS]

Same happened to me on my tp link w8968.

Then i switched to modem plus router setup. Tp link products always get high ping on ADSL2+.

Tested with td 8817 modem.. Used a digisol modem and ping was back to 20 for ADSL2+.

Are u panzer on India broadband forum?

 

[panzer008]

Are u panzer on India broadband forum?

Yup..

 

[mach9]

interesting..didn't know the TP-link settings made such a big difference for ADSL2+ and on G.dmt..

I tried to switching from 2+ to G.dmt & my attentuation dropped for 62+ to 56 on downstream

 

[panzer008]

interesting..didn't know the TP-link settings made such a big difference for ADSL2+ and on G.dmt..

I tried to switching from 2+ to G.dmt & my attentuation dropped for 62+ to 56 on downstream

did tht hav an effect on ur pings or speeds like mine??

I dont think MTNL DSLAM likes my W8970 modem...... though I must say net has worked flawlessly on G.dmt.......

 

[mach9]

did tht hav an effect on ur pings or speeds like mine??

I dont think MTNL DSLAM likes my W8970 modem...... though I must say net has worked flawlessly on G.dmt.......

Didnt do a before - after check.. will do it tmrw

 

[prateekS]

I used to get 120 ping on ADSL2+ on 8968.

Used to get 20 on g. Dmt

 

[panzer008]

Anyone using TP Link ADSL2+ routers...... can chk if ur download speed(KBps) increases on G.dmt??
mach9.... prateekS... can u pls chk??
Coz I dont think its a faulty router issue........

 

[prateekS]

Anyone using TP Link ADSL2+ routers...... can chk if ur download speed(KBps) increases on G.dmt??
mach9.... prateekS... can u pls chk??
Coz I dont think its a faulty router issue........

Speed remains same, I get 1 Mbps on g. Dmt too..

 

[panzer008]

ok...... I forgot to mention...... u need 2Mbps to test....... Even I get 1Mbps on both modulations during my 1Mbps period..... but after 8PM I get 2Mbps...... thts when speed increases frm 100 to 140KBps only, instead of 200KBps....

 

[blr_p]

Now on the TPLINK W8970 I am getting DL speeds capped to 140-141KBps and ping increased to 195ms to same EU servers with ADSL2+ modulation....... Why is this???...... Why is my speed getting capped??....... bcoz of which ping is also increasing....

ADSL2+ requires good SNR to deliver high speeds. Your line isn't capable. g.dmt has more error tolerance than adsl2+ so you will get more consistent throughput with it.

Do you know how far in distance you from the ISP's exhange ?

Line stats r also very diff than the Linksys(but I think its router to router)......

Yep, the differences between the d-link and tp-link are because each has its own way of measuring these characteristics. They are not transferable. The only thing you can measure is what download/upload/ping speeds you get etc.

But if I chg modulation on W8970 to G.dmt...... I get usual DL speeds of 200-210KBps and 170ms ping to EU..... but max attainable rate goes down frm 22700kbps to just 6300kbps...... which is not a concern now but if I want to upgrade to MTNL's new 8Mbps plan it will hamper my speeds then.......

g,dmt should be good upto 2.5 Mbs.

adsl+ should get you to 8Mbs

adsl2+ is for 16Mbs and beyond.

The question is whether you can get decent throughput with adsl+. Forget 2+. If you cannot get a consistent throughput then stick with your present speed as your line just cannot handle it. So your modems are capable its the line that may not be. You can always do a test for a month and see. If it does not work, then go back to your old plan.

 

[panzer008]

ADSL2+ requires good SNR to deliver high speeds. Your line isn't capable. g.dmt has more error tolerance than adsl2+ so you will get more consistent throughput with it.

My Downstream SNR of 39dB isnt good??...... I think its gr888...... Last I knew u hardly need 15dB to hav stable connection......... Also I was using ADSL2+ modulation for the last 4yrs on Linksys WAG54G2..... No disconnects.......
I dont think line is the problem..... especially when the W8970 is showing "Max Attainable Rate" is 22.7Mbps....... so providing 2Mbps on the line shouldnt be too much of a problem for it......

Do you know how far in distance you from the ISP's exhange ?

Am just 1.1Km frm my exchange......

Yep, the differences between the d-link and tp-link are because each has its own way of measuring these characteristics. They are not transferable. The only thing you can measure is what download/upload/ping speeds you get etc.

Well....... thts wht am trying to compare...... the speeds r not comparable..... I get 210KBps on the WAG54G2 with ADSL2+...... but only get 140KBps on W8970..... even when its "Max Attainable Rate" is 22.7Mbps...... so the line is capable but something is stopping it/limiting it frm providing the full 2Mbps.....

The question is whether you can get decent throughput with adsl+. Forget 2+. If you cannot get a consistent throughput then stick with your present speed as your line just cannot handle it. So your modems are capable its the line that may not be. You can always do a test for a month and see. If it does not work, then go back to your old plan.

Tht is also a problem my frnd...... coz my current plan is unavailable....... so cant subscribe to it again...... it has no FUP so I get 12hrs of 2Mbps and 12hrs of 1Mbps...... I will try to test the router on somebody's 8Mbps line......

I think its not line fault..... I think the chipset used in the modem of the W8970 is not compatible with MTNL's DSLAM...... take for eg this thread: Netgear N150

 

[prateekS]

When I used to get 2mbps earlier, I used to get 1.9mbos on g. Dmt.

And download speeds of 230-240+..

 

[blr_p]

Well....... thts wht am trying to compare...... the speeds r not comparable..... I get 210KBps on the WAG54G2 with ADSL2+...... but only get 140KBps on W8970..... even when its "Max Attainable Rate" is 22.7Mbps...... so the line is capable but something is stopping it/limiting it frm providing the full 2Mbps.....

So the linksys implements adsl2+ better than the tp-link.

Tht is also a problem my frnd...... coz my current plan is unavailable....... so cant subscribe to it again...... it has no FUP so I get 12hrs of 2Mbps and 12hrs of 1Mbps...... I will try to test the router on somebody's 8Mbps line......

You mention g.dmt & adsl2+. Isnt' there something in between ? adsl+ or similar. That should be able to handle your 8Mps.

I think its not line fault..... I think the chipset used in the modem of the W8970 is not compatible with MTNL's DSLAM...... take for eg this thread: Netgear N150

ok so lets check out the chipset involved then.

Linksys WAG54G2 ADSL2+ chipset
TP LINK TD-W8970 ADSL2+ chipset

Now how are you going to figure out what chipset your DSLAM uses ?

Know what ? if there was a compatibility problem, then the product would not work at all. These devices follow a certain protocol, every modem talks the same language otherwise the product will not get sold.

The d-link has better filtering or firmware than the tp-link.

 

[panzer008]

You mention g.dmt & adsl2+. Isnt' there something in between ? adsl+ or similar. That should be able to handle your 8Mps.

There is ADSL2 inbetwn them........ I tried it..... gives "Max Attainable Rate" of 12Mbps..... connects at 2048kbps as usual..... but also caps DL speed at 140KBps........ ping also increases by 20ms......

So the linksys implements adsl2+ better than the tp-link.

I was of the opinion tht its just a protocol...... u know.... like say in Wifi a/b/g/n......
So how to find out if a router has better filtering or implements protocols better....... I mean I read reviews..... even threads on TE....... Even u recommended W8968/W8970 to DarkAngel in his thread...... so I thought it was a safe pick......

It still is...... as its giving me promised speeds on diff protocol...... also I love its Wifi range all arnd 2BHK.... so no complaints...... plus my Huawei E3131Bs-1 3G Data Card with Vodafone 3G works gr8 on it as well....... Gigabit Ethernet is so useful as well.......

Lets not waste time on how it will perform on 8Mbps..... I'll go and find an 8Mbps connection to test the router...... will then report here.....

Meanwhile also hope there is another FW update for this router...... last update came in Aug 2013

 

[blr_p]

I did not recommend this particular model, it was the w8968 or W8961 and the reason for that was the wifi chip it had was a ralink. Both have the ralink chip, except the 8961 has gone v3, so we don't know what chip the w8961 has any more but the v2 of that model was good. And cheaper if you don't need a usb port.

The w8970 has an atheros and is a N450. Kind of a waste unless you have 3x3 wifi clients and even if you did the range tends to limited to benefit from a 3x3 link speed. Was not even aware there was a 3x3 adsl wifi router from tp-link.

My guess is its a firmware issue, your model is quite recent maybe a firmware update will fix it. Have you checked you are running the latest firmware for your model ? oh just saw you're running the aug version.

So go to the tp-link forums and raise the issue. How do you know about these issues before buying. One rule of thumb is any device that is new has bugs. Takes time to fix, months & months. If you want to be sure then a slightly older model is a safer bet. Provided you can get it, these router vendors deprecate their products on a yearly basis and change things under the hood, bring out the next version and keep the model number the same. Its frustrating as any reviews will be dated to the model they were tested on. They change chipsets or not which affects performance and price too.

 

[panzer008]

I tested my W8970 on my uncles new MTNL 8Mbps...... suprise.... suprise..... ADSL2+ modulation works so well....... tht speedtest is showing 9Mbps consistently even when am connected at 8192kbps...... ping to MTNL DNS is 6ms now frm 60ms.......

So this router is working perfectly...... its just tht it doesnt like 2Mbps speeds...... 8Mbps is OK.......

So applying for 8Mbps immediately.....

Ping is wht I was more concerned abt...... on 1or2Mbps its always 60ms to MTNL..... but on 8Mbps its just 6-7ms....... so much difference??...... so overall ping to EU has gone down to 129ms frm 190-200ms....

Dont feel like going home..... cant play on 60ms higher ping again...... hopefully they activate my 8Mbps soon.....

Thx all for all the Help.......