TD-W8970 ADSL2+ Modulation Problem

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TD-W8970 ADSL2+ Modulation Problem

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
TD-W8970 ADSL2+ Modulation Problem
TD-W8970 ADSL2+ Modulation Problem
2013-10-22 17:06:07
Region : India

Model : TD-W8970

Hardware Version : V1

Firmware Version : 0.6.0 2.8 v000c.0 Build 130828 Rel.38099n

ISP : MTNL


ADSL Subscribed 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 ADSL2+ modulation and get 200-210KBps DL speeds with ping to EU arnd 170ms..

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....

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....

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

P.S: Why is my reply post taking more than 15hrs now to be moderated........ when will it be posted...... so I can get some help....... admin pls....
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#1
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6 Reply
Re:TD-W8970 ADSL2+ Modulation Problem
2013-10-22 17:31:13
you can have this try:when you have dialed up to the Internet,go to 8970's WEB management interface.
In status page,you can see DSL,check "the current rate"(upstream and downstream),check if it's almost equal to your ISP provided rate
If it's much lower then your ISP provided rate,go to Network---)DSL Settings,choose "DSL Modulation Type" with "Auto Sync-up",and choose "Annex Type" with "Annex A/L",save
then check in status page about the information above I referred
normally,8970 won't have such low sync rate when in ADSL2+
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#2
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Re:TD-W8970 ADSL2+ Modulation Problem
2013-10-23 23:19:39
@James

The "Current Rate" on ADSL2+ / Auto Sync-up remains same..... at 2044kbps DL and 504kbps UL....... so tht is according to my ISP plan.......

On G.dmt "Current Rate" is also same....... at 2048kbps DL and 512kbps UL.....

By Default the router was set to "Auto Sync-up" and "Annex A/L"...... I even tried it after ur post...... but if I chk in "Status" page it auto selects ADSL2+........ and the problem of speed capping persists.......

I have tried ADSL2+ with all available Annex types as well....... but no use.....

On ADSL2+ "Max Rate" downstream is ~22700kbps...... whereas on G.dmt is ~6000kbps....... still G.dmt gives full 210KBps DL speed....... and ADSL2+ caps speed at 140KBps DL.....

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#3
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Re:TD-W8970 ADSL2+ Modulation Problem
2013-10-24 09:07:23
hmmm.....the 2nd picture you showed is your 8970 with ADSL 2+?
That's DL 2044,it' normal....
If not,and your 8970 still limited your DL speed with 140KB/s,I think something must go wrong with your 8970,you should replace it in the shop where you buy....
maybe you can ask others who use 8970,I don't think they will have the same problem with you
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#4
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Re:TD-W8970 ADSL2+ Modulation Problem
2013-10-24 18:33:43
I tried with 2 more routers......

Netgear N150 (DGN1000) : Same result........ ADSL2+ caps speed at 140KBps... but G.dmt gives full 210KBps.....

D-Link DSL-2750U: ADSL2+ speed clocks 210KBps...... G.dmt clocks 200KBps.......

Also my earlier router Linksys WAG54G2(which is still in perfectly working condition): ADSL2+ clocks 210KBps......
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#5
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Re:TD-W8970 ADSL2+ Modulation Problem
2013-10-24 20:13:38
really weired.....
contact the shop you buy it to see what's wrong with your 8970,and also DGN1000.........
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#6
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Re:TD-W8970 ADSL2+ Modulation Problem
2013-11-08 20:12:53
Update:

I chked my W8970 router on my uncles 8Mbps ADSL..... Works perfectly......

On ADSL2+ modulation..... ping to ISP gateway is just 6ms frm wht was 70ms on 2Mbps...... and speeds consistently higher than 8Mbps....... so router plus the ADSL2+ modulation works fine........

So I think this router is working gr8..... gr8 pings and gr8 speeds...... plus mainly stability of connection..... hasnt dropped once yet......

I hav immediately applied for 8Mbps as well....... will be able to enjoy this router
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#7
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