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Posted by Eugene Blanchard on May 1, 2006, 5:53 pm
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This got me curious and after a bit of searching, I found out that you ISDN
and ADSL occupy the same bandwith. ADSL upstream bandwidth overlaps with
ISDN:
0 - 4kHz Voice
0 - 80kHz ISDN 80 kHz BW
26 kHz - 138 khz ADSL upstream bandwidth
138 kHz - 1.1 Mhz ADSL downstream bandwidth
So it doesn't look like ADSL and ISDN can run on the same local loop. There
is the alternative of using the black and yellow pair for one and red and
green pair for the other.
Eugene Blanchard wrote:
> I believe that the following is the bandwidth allocation for voice, ISDN
> and ADSL
>
> 0 - 4kHz Voice
> 0 - 80kHz ISDN 80 kHz BW
> 100kHz - 1.1 Mhz ADSL
>
> In the US and Europe, ISDN uses the echo canceler method instead of TCM
> with an 80-kHz bandwidth, which does not overlap with the ADSL bandwidth.
>
> In Japan, ISDN uses a 320kHz bw which overlaps with ADSL
>
> M. Bayerer wrote:
>
>> Hello newsgroup,
>> we are three enthusiasted electronics amateurs and we got that idea into
>> our heads to build our own splitter box. I have a ISDN+ADSL connection at
>> home. Based on that connection we would like to separate the
>> a) DSL signal
>> b) ISDN signal
>> c) Analog telephone signal (POTS?)
>> with an appropriate self-implemented hardware setup.
>> Does someone have experience with this, which he / she would like to
>> share with me? Has somebody already implemented such a cicruit or could
>> someone explain to me how this is achieved best? A block diagram would be
>> surely helpful, because unfortunately we do not have much notion of the
>> whole telecom stuff.
>> Are there integrated solutions, i.e. special components, which one could
>> use? I would search for components myself but I don't have a clue under
>> which keyword those components are traded? It would also be helpful to
>> know something about the expected signal characteristics, e.g. voltage
>> swing, offset, frequency range, etc. I can remember something like
>> voltage offset of -60V at the POTS signal.... or something like that?
>> What about the ringing impulse with ISDN and POTS? It is definitely
>> different with bioth, I guess?!
>>
>> Any kind of answer and held is highly appreciated.
>>
>> Best regards Max
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