Wireline emulation for ADSL testing

A lumped-constant line is only good for frequencies well below the low-pass limit set by one LC branch in the line. In your case, it is around 27 kHz, which is far too little for any DSL mode.

To make it useful, you have to use much smaller inductances and capacitances, keeping their ratio, and adding more of the LC units to the line.

It is just a schematic from Eagle PCB designer ;-)

I've been just crawling around some Spice implementations to find my own one, but I haven't chosen the One yet. I played with LT Spice for a few minutes but I didn't like its editor. But since the important factor is also the size of community that uses it, maybe it would not be that bad solution. Let me try it again.

I'll look for it. Many thanks for suggestion.

I don't need a very precise model, but something that will be "similar" and more convinient than a few kilometers of cable on the floor.

No, this is just a pure fake antispam e-mail address. But you can use "kiziuk" username at the same provider that you use as well :-). This will be the right one.

I haven't thought that this would be the very important part for this design. What I was intending to do was to get more familiar with the right "electrical" design and then maybe try to improve PCB design.

Please note that an ADSL receiver is actually a wideband radio receiver, and all normal radio design precautions apply.

Am 17.03.2015 um 14:13 schrieb Bartosz:

I find the editor quite cool. It uses unusal keys but if you play around for a while, you'll memorize them. But, for example, you can place several parts on your sheet, press F3 for wire and connect them without terminating the wire. Just draw straight over the parts. At first it looks as if you produce a single big short circuit but if you terminate the wire, all short circuits are removed! Also, if you place a part over an existing wire, it will be inserted correctly. I have never seen a schematic program that works like this!

Cheers,

Robert

sent! look for it THAT server likes to put everything into spam and let you figure it ou!

You're right. Absolutely amazing :-) I didn't thought that it is possible, so didn't even try.

Good morning !

May be you should read the ITU 992.X standards. As a starting point you should get the normalized Z POTS to feed LTSpice with this model and .. simulate an eye diagram of the transmission. It's a business IMHO !

H.

I started to play with LTSpice, but this week, due to lack of time for it, I needed to postpone all of it... Anyway, I'll be digging it more, possibly next week.