Dlink DSL2500u

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Rage101

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Hi

I have read a lot of good things about these simple and cost effective routers, the only thing i could not find any information about them was if you could adjust the target SNR margins . After spending some time in the CLI ,it is indeed possible - even after speaking to Dlink SA support who claimed that it was not possible on any of the modems ;)...

Here is a snapshot of the firware and connection speeds before messing around ( i have a very long noisy adls line)

Board ID: 96332
Software Version: RU_1.53
Bootloader (CFE) Version: 1.0.37-8.7
Release Date: Oct. 28, 2009

Downstream Upstream
SNR Margin (dB): 13.4 9.0
Attenuation (dB): 63.5 31.5
Output Power (dBm): 12.4 16.6
Attainable Rate (Kbps): 2400 716
Rate (Kbps): 1024 512


After Chaging the target SNR
adsl Configure –snr 350
Downstream Upstream
SNR Margin (dB): 22.9 9.0
Attenuation (dB): 63.5 31.5
Output Power (dBm): 12.4 16.6
Attainable Rate (Kbps): 864 704
Rate (Kbps): 896 512

interesting Enough my max Attainable Rate can reach 4mb With
adsl Configure –snr 25 , but i doubt the line would be very stable

SNR Margin (dB): 14.1 10.0
Attenuation (dB): 63.5 31.5
Output Power (dBm): 12.2 10.3
Attainable Rate (Kbps): 4064 712
Rate (Kbps): 1024 512

Also to note , This Small router is holding the line much better than my netgear dg384 v5 , The netgear's noise margin hangs around 6-9db and spikes anything up to -9 :erm:

All in all , bang for buck id say this little router is a winner ( i paid R210 for mine )
 
I have to say that I really appreciate my TP-Link W8960N. Had it for a year now and not a single issue.

Although I am tempted to replace it with this TP-LINK WR2543ND
 
Last edited:
I have not had problems with my 2500U either. Only thing about your configuration, is that I don't think you can save it across reboots. So you need to have some mechanism for repeating this everytime you have a power failure.
 
Thanks for that command Rage101 ! I knew that the D-Link has a CLI where you can add routes, dial PPPoE connections, etc., but I never knew that you can set a target SNR margin!

I've also replaced a Netgear DG834GUv5 with a D-Link DSL-2500U and never had any ADSL connectivity issues after I made that change.
 
RoganDawes said:
I have not had problems with my 2500U either. Only thing about your configuration, is that I don't think you can save it across reboots. So you need to have some mechanism for repeating this everytime you have a power failure.
Click to expand...

Correct !

I am busy writing a little utility to manage the router , possibly graph noise and connection speeds , the only thing i have not yet been able to find is a uptime counter
 
To sweeten the deal, with D-Link you have local telephonic support from 08h00 - 22h00 Mon - Fri. The PSUs on their older models aren't the best though, but get swapped under warranty.
 
I've been raving about it for years now.

My setup is 2500U + Linksys WRT54GL (DD-WRT).

I did quite a bit of research before buying. The chipset used on that router is pretty much the best around for bad quality lines. Not just that it is stable. Mine runs for months without a reset. Most stable internet I've ever experienced :p (2500u + dd-wrt).

Keep in mind only the 2500U uses that chipset when I checked. It is very simple and unlikely to be used in their higher end products.
 
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There are actually quite a few different revisions of the DSL-2500U, and I'm wondering if they all use the same/great modem chipset?

One thing that I'm missing with the D-Link ADSL modems are that they're not showing for how long the PPPoE/ADSL connection has been up. Since I'm dialing the PPPoE connections with the MikroTik, I can get the PPPoE uptime, but that ain't as accurate since some ISP's reset it too.

The DSL-2500U + Linksys WRT54GL is a legendary setup! I actually setup my dad's old Linksys WRT54GL (also running DD-WRT) for a worshop where they have 2x 3G modems for Internet. Setting up that router is a pure joy compared to other routers (with MikroTik being the only exception for me).

Both at my parent's home and at the church I'm using a DSL-2500U + MikroTik RB750, and both are rock solid. At my flat I'm using an ancient Telkom 5100 modem + Buffalo WZR-HP-G300NH (DD-WRT) router + Intel Atom (with MikroTik RouterOS in a VM) :D
I just prefer MikroTik above DD-WRT, because you can set everything with Telnet/SSH and changing the settings doesn't require a reboot like with DD-WRT.
 
Last edited:
PostmanPot said:
To sweeten the deal, with D-Link you have local telephonic support from 08h00 - 22h00 Mon - Fri. The PSUs on their older models aren't the best though, but get swapped under warranty.
Click to expand...
D-Link told me there is NO warranty on their power supplies and they cost as much as over half a new one.

The 2640U is easy to use, but build quality is pants.
 
Lounger said:
D-Link told me there is NO warranty on their power supplies and they cost as much as over half a new one.

The 2640U is easy to use, but build quality is pants.
Click to expand...

They have one year warranties according to one of their reps in Cpt. I was quoted a lot less than half price of a new modem/router, but this could be model specific.
 
Lounger said:
D-Link told me there is NO warranty on their power supplies and they cost as much as over half a new one.

The 2640U is easy to use, but build quality is pants.
Click to expand...

The powersupply is cheap to replace. Communica in Pta sells regulated SMPS that provide the voltage needed by the router for R50.
 
Gnome said:
The powersupply is cheap to replace. Communica in Pta sells regulated SMPS that provide the voltage needed by the router for R50.
Click to expand...
I was told that would then void the warranty on the base unit.

Pot, the warranty does not cover the PSU. Check with D-Link SA. This was the first thing they told me, even though the problem was not that. They assume it is because it usually is the power.
 
Rage101 said:
Hi

I have read a lot of good things about these simple and cost effective routers, the only thing i could not find any information about them was if you could adjust the target SNR margins . After spending some time in the CLI ,it is indeed possible - even after speaking to Dlink SA support who claimed that it was not possible on any of the modems ;)...

Here is a snapshot of the firware and connection speeds before messing around ( i have a very long noisy adls line)

Board ID: 96332
Software Version: RU_1.53
Bootloader (CFE) Version: 1.0.37-8.7
Release Date: Oct. 28, 2009

Downstream Upstream
SNR Margin (dB): 13.4 9.0
Attenuation (dB): 63.5 31.5
Output Power (dBm): 12.4 16.6
Attainable Rate (Kbps): 2400 716
Rate (Kbps): 1024 512


After Chaging the target SNR
adsl Configure –snr 350
Downstream Upstream
SNR Margin (dB): 22.9 9.0
Attenuation (dB): 63.5 31.5
Output Power (dBm): 12.4 16.6
Attainable Rate (Kbps): 864 704
Rate (Kbps): 896 512

interesting Enough my max Attainable Rate can reach 4mb With
adsl Configure –snr 25 , but i doubt the line would be very stable

SNR Margin (dB): 14.1 10.0
Attenuation (dB): 63.5 31.5
Output Power (dBm): 12.2 10.3
Attainable Rate (Kbps): 4064 712
Rate (Kbps): 1024 512

Also to note , This Small router is holding the line much better than my netgear dg384 v5 , The netgear's noise margin hangs around 6-9db and spikes anything up to -9 :erm:

All in all , bang for buck id say this little router is a winner ( i paid R210 for mine )
Click to expand...

For the love of all things electronic, someone tell me how to set the target SNR margin.
 
agentrfr said:
For the love of all things electronic, someone tell me how to set the target SNR margin.
Click to expand...
You cannot do that with the D-Link modem - or at least not via the web page.

Why do you want to set the target SNR margin?

If you want a certain target, call Telkom to downgrade your line until that target is reached...
 
I've figured out how to telnet into the device, but it doesnt respond to "adsl Configure –snr 350 ". Am I going to have to muck about in the firmware?

Pada said:
You cannot do that with the D-Link modem - or at least not via the web page.

Why do you want to set the target SNR margin?

If you want a certain target, call Telkom to downgrade your line until that target is reached...
Click to expand...

My router can connect stably at 3300kbps, with an SNR of 6.5ish. But sometimes it just connects at say 2800kbps, with an SNR of 8 or 9. I want to try force it to go to 6-7ish to have the line go as fast as possible.

Telkom don't set target SNRs on their exchanges, the exchanges accept whatever the adsl router sends them.
 
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