Crazy question I know, but
Will an ADSL pots splitter, specifically the German Telekom pots splitter 40202 387 work in Spain to split the signal?
I ask because mine has just gone south and these are priced pretty cheaply on ebay.
I assume this is the same as the ADSL filter?
In this case it is likely to work, socket/plug permitting!
Only thing that worries me is your mentioning high costs; filters are very cheap. Even so called “professional” examples e.g.:
http://www.cablecity.co.uk/product_info.php?products_id=1306
So I hope we are talking about the same thing.
No, that’s a filter. I have many 
I am talking about a pots splitter. Cable from the telephone company enters at one end and at the other, two outlets. One goes to voice and the other to data. Eliminates the need for those filters.
POTS splitters have no filter.
ADSL splitters would have a filter in the voice split.
any unneeded splitters and devices can degrade a signal. if you need it then you need it.
i don’t know specifics of ADSL in Germany or Spain.
A POTS splitter for DSL is pretty much just a filter packaged in a box with “before” and “after” terminals.
In the past, I have cobbled together a splitter at the NID or demarc by using a filter in order to avoid needing filters at every phone.
Of course, I have no experience with European phone lines, but AFAIK, DSL and phone lines are pretty much universal.
There might be varying standards, but the basic job is to separate some very high frequencies (100kHz and up) from voice frequencies, which on phone systems are about 300 to 2800 Hz. That’s a meat-cleaver job, electronicallywise speaking. I’d bet that any DSL splitter/filter would work anywhere in the world, jacks permitting.
The device I linked to is a splitter/filter; it takes the company-phone line in, and gives both a phone and DSL (modem) out.
No reason not to connect multiple phones to the “phone out”, but of course only one ADSL modem to the “dsl out”.
All the filters I use here in France are like that.
I assume you have a single splitter where the line enters the house. That box contains a filter, and you need no extra filters on the phone sockets round the house. But it really does no more than these cheap filters.
take a look at:
http://www.epanorama.net/documents/telecom/adsl_filter.html
BUT!!!
Germany often uses ISDN lines to carry ADSL, not POTS. Check this out before getting the Telkom device…
This is like saying they use fiber optic to carry cable Internet connections. If you have ISDN, there’s no point to using ADSL. You carry data over the data channels defined as part of ISDN and don’t bother with the high-frequency modulation part that defines what ADSL is.
Darleth, no it is NOT. There is a good reason to “bother with” the high frequencies.. to get proper internet speeds.
ISDN on a single copper pair, is BRI ISDN, which is up to 128 kbs.
That is nothing like ADSL, ADSL2+ (up to 8mbs and 24 mbs ) ,or cable or fibre.
And when used for data at 128kbs, no phone calls are possible.
So for a country where most homes do not have an analogue phone , but do have ISDN BRI phones, and ISDN BRI phone lines therefore, they do have ADSL annex B which is ADSL for use on ISDN BRI lines.
Annex B is different from ADSL Annex A(or similar), in that its lowest ADSL frequency up from 25 kHz to around 135 kHz .. (to allow ISDN to work in the first 125 kHz , whereas analog voice only needs 15 kHz.. )
Huh, I had no idea that they could carry an ADSL signal over ISDN. I’m not saying you are wrong, but, you learn a new thing every day!
I never thought about it as I did not think it would be worth it as the end result would be the same: 128kbps.
But, I’m guessing that the physical layer (the copper ISDN lines) are shared upto the “splitter”. The splitter provides for two circuits, each for the network interface of the ISDN phone, and, the other for the ADSL modem.
Now that I think about it, makes sense and is totally do-able.
BUT, you would need to know if you were using an ISDN or POTS phone. There are voltage differences as POTS uses, IIRC, AC/DC signals for hang-up, ring, talk, etc. This might/not be an issue for your ADSL modem, and would there be any impedance mismatch issues? I think ISDN being a “newer” format would have something standard like 50 or 75 ohms and POTS did not care.
Isilder: Wow. It appears you’re correct. Chalk another one up to someone being so wrong they didn’t bother to do research because their wrongness was so complete it engendered confidence.
And, as if to rub my nose in it, a Google search for ‘ADSL over ISDN’ without quotes brings up this SDMB thread from 2005.