[Asterisk-Users] EuroISDN BRI 2 or 4 wires?

[Thomas Niesel]

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