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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>This is a simplistic description, but should help you understand how it works. As you will know, there are two wires from the exchange. In the early systems there would be a ‘master’ outlet which had a capacitor, and usually a test resistor and lightening arrestor. Typically this outlet would have a ‘M’ on the front somewhere. This ‘master’ outlet separated the ring signal from the line and sent it to any connected phones using a third wire (usually blue). All other outlets had the same PCB inside but the components were not installed. These were called ‘Secondary’ outlets and had an ‘S’ on the front. This system was known as the ‘three wire’ system. Following this, they moved to a system where each outlet had its own capacitor and the ring signal was separated out at each outlet. This was called the ‘2 wire’ system and the outlets had a ‘2’ on the front. Nowadays, most phones have their own capacitor or other circuitry built in to handle the ring signals. The simple way to tell this is if the phone only has two wires in its line cord. Because of this you may not need a capacitor in any outlets, and so any type will do. Hope this helps.<o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'>Mark.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> TheList [mailto:thelist-bounces@radiowiki.org.nz] <b>On Behalf Of </b>John Barnhill<br><b>Sent:</b> Monday, 29 October 2012 3:40 p.m.<br><b>To:</b> thelist@radiowiki.org.nz<br><b>Subject:</b> [TheList] Phone Jacks<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>I am needing to replace my ‘master jack’ which has gone faulty (phone rings but no voice/line noise) – it is a ‘Saturn’ jack and has a 105K250JS capacitor inside it. The 3 extension ‘jacks’ that are fed from this ‘master’ are all working OK. Once I mention the ‘capacitor’ to DSE, Jaycar, Egleys etc. they all go into ‘don’t know mode’. As I don’t have a ‘line maintenance contract’ with Telstra Clear (who took over Saturn) they want $300 to have a look at it. What ‘phone jack’ should I be asking for?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>John B<o:p></o:p></span></p></div></body></html>