On Wed, Jan 12, 2005 at 11:06:18PM +0100, Remco Barende
wrote:> Hi List!
>
> Have a weird problem with ISDN in The Netherlands.
>
> The line that is coming in from the telco is 2 wires. The line is
> connected to an NT1 using the middle pair of a UTP connector. So far sop
> good.
The incomming 2 wires are called UK0 here in Germany and they are connected to
the
NT1 or NTBA.
>
> However, the outgoing ports on the NT1, should they be wired with 2 wires
> or 4 (2 pairs)?
The outgoing Line from the NT1/NTBA is a 4 wire (2pairs) bus called S0.
>
> If I use a 4 wire cable and stick it in the NT1 I get 0 voltage on the
> middle 2 wires, but i get approx 4 volts on the left 2 wires and another
> 40 volts on the outer (right) 2 wires. Is it correct that 2 pairs should
> be used to connect ISDN devices?
Yepp, if you can read german have a look at www.kabelfaq.de . There is a well
explained
overview about isdn.
>
> Sorry for this slightly offtopic issue. The house is fully
> wired for one pair which means I may have a problem if i need 2 pairs.
>
> Thanks!
> Remco
>
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--
Tho/\/\as