Why not just look at the light?  On the modem I have, the LEDs blink if it's not working or are on and not blinking if it works.  I used to have one with LEDs that would change color, green if working, red if not working.
On 07/02/2013 05:41 PM, Ryan Rix wrote:
To test with a multimeter whether the DSL is working or not:

* Unscrew case for DSL modem such that the board is visible
* Set multimeter to read DC voltage 
* On the front of the modem will be a small LED which lights up depending on 
the connection quality of the DSL modem
* Attach one lead to each of the LED's two contacts

If there is a voltage measured by the multimeter, then congratulations, the 
DSL is working! If not, you will need to contact your service provider for 
more help.

I have successfully used this method to test my wireless router in the past, 
it works wonders when you're trying to debug these things. See the image I 
have attached for the method I personally use: 
http://wstaw.org/m/2013/07/03/disassembled.jpg

Warning: Do not short anything across the board with your multimeter leads as 
that may lead to damage to modem, multimeter, cables, cat or personal death, 
dismemberment or incontinence.

On Mon 1 July 2013 18:31:02 Michael Havens wrote:


I was having a lady ask me about fixing her dsl. Now.... I'm told that dsl
sounds like static  over a buttset; unfortunately, perhaps that was a few
years ago because when I test that on my dsl line I hear nothing. So I need
to ask, how does one test dsl with a multimeter?

:-)~MIKE~(-:



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