dave@mmp Posted April 27, 2012 Share Posted April 27, 2012 Are there any products out there to allow me to connect a PA system to a digital phone line in the same way I currently connect to an analogue line via a tbu?Thanks Link to comment Share on other sites More sharing options...
Shez Posted April 27, 2012 Share Posted April 27, 2012 Hi Dave, Welcome to the forum. Could you be more specific about the type of phone line you're referring to? There are a number of different technologies that could be called digital phone lines, all of which are different and would require different solutions. Link to comment Share on other sites More sharing options...
mac.calder Posted April 27, 2012 Share Posted April 27, 2012 Well... you could use a PC running a Soft-phone - that's a fairly cheap and simple way... or there is this one: TBU-IP Link to comment Share on other sites More sharing options...
dave@mmp Posted April 27, 2012 Author Share Posted April 27, 2012 Thanks for the replies, I'm referring to the typical digital lines installed in many hotels now rather than VoIP. I've looked at the audio TX unit but that appears to be for VoIP. My understanding of the different digital telephone systems is though very limited. I will also look at Soft Phone. Link to comment Share on other sites More sharing options...
mac.calder Posted April 27, 2012 Share Posted April 27, 2012 The main problem is that each venue will need their IT (or telecoms) techs to configure the device for you - it is not like analogue where you plug into an enabled port and voila. Better bet is to see if they have an ATA (Analogue Telephone Adaptor) that could be used. Link to comment Share on other sites More sharing options...
plinque Posted April 27, 2012 Share Posted April 27, 2012 There are, and they'll almost certainly work with any telephone system. Here's what I use:http://www.jkaudio.c...nkeeper-pbx.htmWe have two units, one each for sending/receving Japanese and English for offsite participants in video/telephone conferences. They are connected between the the telephone base unit and its handset. This actually works really well. The units are stable, easy to configure and straightforward to integrate into the audio system.Nice price, too. I'm just a very happy customer! JoelAre there any products out there to allow me to connect a PA system to a digital phone line in the same way I currently connect to an analogue line via a tbu?Thanks Link to comment Share on other sites More sharing options...
dave@mmp Posted April 27, 2012 Author Share Posted April 27, 2012 Thanks Plinque that looks like a good option. Link to comment Share on other sites More sharing options...
dbuckley Posted April 27, 2012 Share Posted April 27, 2012 Unlike old school POTS, every digital phone system is proprietry to a greater or lesser degree, and thus you can't connect a "digital hybrid" to the line and expect it to work. Thus a device that connects to the handset will "always" work, as long as you can physically connect to it, which is generally possible as most handsets use the same connectors which looks like a RJ jack (but actually isn't). And the phone internally has to keep tx an rx separate. JK audio stuff is good, I have one of their analogue hybrids. Link to comment Share on other sites More sharing options...
plinque Posted April 28, 2012 Share Posted April 28, 2012 It's an RJ22 connector. A reasonable assumption is that if a handset is connected to a base unit using an RJ22 then it will work. That is my experience so far anyway, but there may be exceptions... JK Audio claim to have come across only three different types of heandset mic: carbon, electret, and dynamic, and their equipment includes a switch to adjust between these. Having been hurt by unexpected combinations of PBX, POTS and ISDN in the past, it pays not to make any guarantees to clients until equipment has been tested in situ. Link to comment Share on other sites More sharing options...
ramdram Posted April 28, 2012 Share Posted April 28, 2012 http://www.sonifex.co.uk/tbu/index.shtml#digital Link to comment Share on other sites More sharing options...
Big_L Posted April 29, 2012 Share Posted April 29, 2012 http://www.sonifex.co.uk/tbu/index.shtml#digital "Note that both of these products are operating on analogue telephone lines, not ISDN digital lines." Link to comment Share on other sites More sharing options...
ramdram Posted April 29, 2012 Share Posted April 29, 2012 Oops, blush moment :wub: did not scroll down to the caveat bit. Link to comment Share on other sites More sharing options...
dbuckley Posted April 30, 2012 Share Posted April 30, 2012 It's an RJ22 connector. That's one name often used for that connector. Wikipedia (correctly) illustrates the "four-contact 4P4C handset plug (also popularly, though incorrectly, called "RJ9", "RJ10", or "RJ22")" The difficulty stems from RJ being shorthand for "registered jack", and that "registered jacks" were originally defined by the Bell Telephone Company as an interface connector, and therefore the interface semantics (both mechanical and electrical) were accurately specified. The handset connector was never so specified, and so it was never "registered". But it looks just like those connectors that are registered, so various folk started calling them by names that weren't already used... So RS will happily sell you RJ22 connectors, and a RJ9 crimping tool to use with them... Link to comment Share on other sites More sharing options...
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