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. However, the outgoing ports on the NT1, should they be wired with 2 wires or 4 (2 pairs)? 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? 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
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 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 > > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > lists.digium.com/mailman/listinfo/asterisk-users >-- Tho/\/\as