[SOLVED] dsl fritz!box splitter behind isdnbox?

ichrispa · 09-02-2006, 02:10 AM

hi,

i have a bit of a problem getting a dsl connection up and running. here's the problem:
The dsl is to be installed in a big office building. The isdn box is all the way down in the basement, the office that ordered the dsl is all the way up in the third floor.

The building is euqiped with isdn junctions. I installed the dsl splitter infront of a junction, not the actual isdn box.

the dsl modem, a fritz!box sl, has been trying to communicate with the provider for quite some time now and is unable to reach him. I suspect the problem is that the bandwith used by the dsl box is filtered when it passes through an isdn line, so the signals of the box don't make any sense after they get multiplexed by the isdn box.

If this is so, I have to run network cables all through this building, which is a hell of a job. So It's better to ask if anyone has had a similar problem first.

Thanks for your help in advance...

snowtigger · 09-02-2006, 08:51 PM

From what you are describing you have some type of telephone exchange downstairs which has an ISDN line to the outside world. Then from this it gets distrubited to each floor. If this is the case then you will not be able to do what I think you are trying.

However all you need is one spare cooper pair to do the job.

ichrispa · 09-03-2006, 03:22 AM

ok, so there is some light at the end of the tunnel.

again, to clarify what I meant: big building. The telephone lines are connected to the basement. There, they are plugged into an ISDN box which multi- and demultiplexes the signals. From that ISDN box the wiring leads to various T-NET distribution boxes all over the building into which one can plug his phone.
I have plugged the DLS splitter into one of those T-NET distribution boxes. In theory, the ISDN box however should filter out the DSL bandwith before the signal can leave the building. The actual symptom of the Fritz!Box is an eternally flashing power LED, meaning it is unable to contact the provider...

Since the building manager is everything but a computer related person I want to avoid using WLAN at all cost. Otherwise the entire neighbourhood will be surfing via my DSL connection when I'm away.

So, what is a cooper pair? And how to I use it to solve the problem?

snowtigger · 09-03-2006, 10:04 AM

An example,

Code:

              ________
             |        |--out1-------
---ISDN-in---|exchange|--out2-------
             |        |--out3-------
             |        |--out4-------
             |________|--out5-  --(goes to required socket)--(M)--(R)--(S)
                               ^(disconnect here)
                              /
---DSL-in--------------------/

You could use WLAN to connect between the two points. If you set up encryption and don't advertise the SSID it should be quite secure. Also if you use two access points that can be set up in bridge mode it will be a little bit harder for some one to connect in to.

For Example,

Code:

                       ___________        ___________     
                      |WLAN AP in |      |WLAN AP in |     
---DSL-in---(M)--(R)--|bridge mode|~    ~|bridge mode|---(S)
                      |___________|      |__________
|_

Key,
(M) is for DSL modem
(R) is for the router
(S) is for switch

An example of an WLAN access point that can operate in bridge mode is a D-Link DWL-2000ap+. Although I expect the are others that can operate like this.

ichrispa · 09-04-2006, 11:35 AM

Thank you very much for your assistance snowtigger