Hi all, I have just been reading an article on the asterisk-doc site about ISDN X-Over cables. The article mentioned the converting of an NT1 to make this possible, has anybody got the information required to modify a BT NT1? Or any information on the BT NT1. Thanks in advance. Regards Dave
On Sat, 5 Feb 2005, Stefan Gofferje wrote:> As far as I know, you just need a second ISDN card and a X-cable. No > mods to the NT1 are needed. To build such a cable, just swap the outer > pair with the inner pair.Termination and power are needed. Most isdn cards provide neither, but some do. Peter
Stefan, Peter, Thanks for the replies guys. I have looked at the web page and will work on it over the weekend. My next step will be to find out hoe the CO lines connect, but that's another project. Regards Dave -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com]On Behalf Of Stefan Gofferje Sent: 05 February 2005 12:48 To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] ISDN X-Over Peter Svensson schrieb:> On Sat, 5 Feb 2005, Stefan Gofferje wrote: > > >>As far as I know, you just need a second ISDN card and a X-cable. No >>mods to the NT1 are needed. To build such a cable, just swap the outer >>pair with the inner pair. > > > Termination and power are needed. Most isdn cards provide neither, but > some do.Yes, as I wrote, I was reading to fast... However, termination may be done by simply connecting a terminated multiplug to the card and power is only needed for phones without own power source. I have e.g. a Siemens Gigaset cordless phone connected to my internal port, so I need no power. But anyway, I believed, David was writing about ISDN monitoring, so my answer was inadequate, I confess. May we PLEASE leave out the tar and feathers? Only this time? :-) Regards, Stefan -- (o_ Stefan Gofferje | Linux Systems Specialist //\ Reg'd Linux User #247167 | SuSE Certified Linux Trainer V_/_ Linux is like a Wigwam - No gates, no windows, Apache inside _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
> David J Carter schrieb: > > Hi all, > > > > I have just been reading an article on the asterisk-doc site about > > ISDN X-Over cables. > > > > The article mentioned the converting of an NT1 to make this > possible, > > has anybody got the information required to modify a BT NT1? > > > > Or any information on the BT NT1. > > As far as I know, you just need a second ISDN card and a X-cable. No > mods to the NT1 are needed. To build such a cable, just swap > the outer > pair with the inner pair. > > 3 ----- 4 > 4 ----- 3 > 5 ----- 6 > 6 ----- 5In Addition, you need bus termination: - Use a device that terminates the bus * Your NT1 does that (often already enabled with dip-switches inside), just plug the x-over to the nt1 as well as your other device(s) * Use a multiplug that terminates the bus - or just put in two 100 ohm resistors, one between 4&5 one between 3&6. Extremely easy and cheap if you cut a cable in half, rewire them using a screw joint, where you can also put the resistors in. Depending on the device you want to connect, you might need bus powered, THEN you really need your NT1 (or a card that provides this feature). Link to PBX4Linux - documentation has already been posted. Greets Stefan -- Stefan M?rkle Netpioneer GmbH Leitender Systemarchitekt Beiertheimer Allee 18 <stefan.maerkle@netpioneer.de> 76137 Karlsruhe