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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>David, from some Google searches it means no voltage, I see this in electrical engineering in environments where dust might explode, like in a grain elevator, my electrical engineer buddy makes electrical control panels for devices that are based on vacuum, you have lots of hoses with air under the panel that lead back to somewhere safe.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Put a volt meter on it and it should read nothing. Where are you going to find a phone without power, ringer, etc.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>dry contact is that the contacts are floating. One example <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>is the COM, NC and NO contacts of the relays. If no voltage <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>is connected to them, it is called dry contacts.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Volt-free and dry contact mean the same thing. If a control <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>system supplier offers a dry contact for you to read as a <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>status bit, then he is offering to close a contact (relay <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>or contact output) that is nothing more that a stand-alone <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>set of contacts with no voltage, current, or anything else <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>impressed across the contact set. It becomes the user's <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>responsibility to determine how to sense that contact <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>closure. Usually you do this by putting a voltage on one <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>side and sensing the voltage on a return line from the <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>other side of the contact when it closes. Once you apply <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>voltage to the contacts, it becomes a wet contact. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>You "wet" the contact with a sensible voltage level.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b>On Behalf Of </b>Eric Butcher<br><b>Sent:</b> Tuesday, November 23, 2010 7:23 PM<br><b>To:</b> David Zhars; Lelio Fulgenzi<br><b>Cc:</b> cisco-voip@puck.nether.net<br><b>Subject:</b> Re: [cisco-voip] Dry Closure Phones<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I think the term dry, in this case, means no voltage is supplied.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>Eric Butcher<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";color:black'>Cisco Unified Communications Engineer</span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><br></span></b><b><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";color:red'>CDW</span></b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'> Professional Services</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>11711 N Meridian, Ste 225</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>Carmel, IN 46032<br></span><span style='font-size:10.0pt;font-family:Wingdings;color:black'>(</span><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'> 317.569.4282 - IP Phone<br></span><span style='font-size:10.0pt;font-family:Wingdings;color:black'>(</span><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'> 765.744.1458 - Mobile<br></span><span style='font-size:10.0pt;font-family:Wingdings;color:black'>*</span><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'> <a href="mailto:eric.butcher@cdw.com">eric.butcher@cdw.com</a></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:black'><a href="http://www.cdw.com/">http://www.cdw.com/</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> David Zhars [mailto:dzhars@gmail.com] <br><b>Sent:</b> Tuesday, November 23, 2010 3:24 PM<br><b>To:</b> Lelio Fulgenzi<br><b>Cc:</b> Eric Butcher; cisco-voip@puck.nether.net<br><b>Subject:</b> Re: [cisco-voip] Dry Closure Phones<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Yes apparently in the Dispatch center, the phones and radio traffic is recorded. Apparently (that word again) the PC needs a "dry closure connection" so the user won't hear both phone and radio at the same time. This may not be doable with what I am seeing, although the TAM stuff might be a possibility. I know the older analog phones definitely had this dry closure stuff. I will keep exploring! Thanks everyone for the feedback.<o:p></o:p></p><div><p class=MsoNormal>On Tue, Nov 23, 2010 at 1:08 PM, Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca">lelio@uoguelph.ca</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>Yes, it looks like it has the more common telco style stipped end and screw type connectors. That's cool.<o:p></o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><br><br>---<br>Lelio Fulgenzi, B.A.<br>Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>Cooking with unix is easy. You just sed it and forget it. <br> - LFJ (with apologies to Mr. Popeil)<o:p></o:p></span></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>From: </span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>"Eric Butcher" <<a href="mailto:Eric.Butcher@cdw.com" target="_blank">Eric.Butcher@cdw.com</a>><o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>To: </span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>"Lelio Fulgenzi" <<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>><o:p></o:p></span></p></div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>Cc: </span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>"David Zhars" <<a href="mailto:dzhars@gmail.com" target="_blank">dzhars@gmail.com</a>>, <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br><b>Sent: </b>Tuesday, November 23, 2010 2:06:23 PM<br><b>Subject: </b>RE: [cisco-voip] Dry Closure Phones<o:p></o:p></span></p><div><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p> </o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>Great! I didn’t know they came out with a new one! The original had 66 style punchdowns for the wires. This one looks to use more convenient methods. Looks like you still have to make your own power wire though </span><span style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><span style='color:black'><o:p></o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:11.0pt;color:black'> </span></b><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:11.0pt;color:black'>Eric Butcher</span></b><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:8.0pt;color:black'>Cisco Unified Communications Engineer</span></b><b><span style='font-size:11.0pt;color:black'><br></span></b><b><span style='font-size:7.5pt;color:red'>CDW</span></b><span style='font-size:7.5pt;color:gray'> Professional Services</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;color:gray'>11711 N Meridian, Ste 225</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;color:gray'>Carmel, IN 46032<br></span><span style='font-size:10.0pt;font-family:Wingdings;color:black'>(</span><span style='font-size:7.5pt;color:black'> 317.569.4282 - IP Phone<br></span><span style='font-size:10.0pt;font-family:Wingdings;color:black'>(</span><span style='font-size:7.5pt;color:black'> 765.744.1458 - Mobile<br></span><span style='font-size:10.0pt;font-family:Wingdings;color:black'>*</span><span style='font-size:7.5pt;color:black'> <a href="mailto:eric.butcher@cdw.com" target="_blank">eric.butcher@cdw.com</a></span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:8.0pt;color:black'><a href="http://www.cdw.com/" target="_blank">http://www.cdw.com/</a></span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><span style='color:black'><o:p></o:p></span></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><span style='color:black'><o:p></o:p></span></p><div><div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:-moz-use-text-color -moz-use-text-color'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;color:black'>From:</span></b><span style='font-size:10.0pt;color:black'> Lelio Fulgenzi [mailto:<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>] <br><b>Sent:</b> Tuesday, November 23, 2010 1:58 PM<br><b>To:</b> Eric Butcher<br><b>Cc:</b> David Zhars; <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br><b>Subject:</b> Re: [cisco-voip] Dry Closure Phones</span><span style='color:black'><o:p></o:p></span></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='color:black'> <o:p></o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><span style='font-size:10.0pt;color:black'>...and it looks like the TAM-B has been updated to the TAMB2!<br><br><a href="http://www.bogen.com/products/telephonepaging/" target="_blank">http://www.bogen.com/products/telephonepaging/</a><br><br><br><br>---<br>Lelio Fulgenzi, B.A.<br>Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>Cooking with unix is easy. You just sed it and forget it. <br> - LFJ (with apologies to Mr. Popeil)</span><span style='color:black'><o:p></o:p></span></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><b><span style='font-size:10.0pt;color:black'>From: </span></b><span style='font-size:10.0pt;color:black'>"Eric Butcher" <<a href="mailto:Eric.Butcher@cdw.com" target="_blank">Eric.Butcher@cdw.com</a>><br><b>To: </b>"David Zhars" <<a href="mailto:dzhars@gmail.com" target="_blank">dzhars@gmail.com</a>>, <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br><b>Sent: </b>Tuesday, November 23, 2010 1:42:18 PM<br><b>Subject: </b>Re: [cisco-voip] Dry Closure Phones</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>With contact closure, you use a pair of wires to create a loop to signal a channel open, and a separate pair of wires to carry the audio (traditional tip and ring pair). You cannot do this without an adaptor. The best way I have found is to use a bogen tam-b or a pagepal, connected to an FXO port.</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:11.0pt;color:black'> </span></b><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:11.0pt;color:black'>Eric Butcher</span></b><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:8.0pt;color:black'>Cisco Unified Communications Engineer</span></b><b><span style='font-size:11.0pt;color:black'><br></span></b><b><span style='font-size:7.5pt;color:red'>CDW</span></b><span style='font-size:7.5pt;color:gray'> Professional Services</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;color:gray'>11711 N Meridian, Ste 225</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:7.5pt;color:gray'>Carmel, IN 46032<br></span><span style='font-size:10.0pt;font-family:Wingdings;color:black'>(</span><span style='font-size:7.5pt;color:black'> 317.569.4282 - IP Phone<br></span><span style='font-size:10.0pt;font-family:Wingdings;color:black'>(</span><span style='font-size:7.5pt;color:black'> 765.744.1458 - Mobile<br></span><span style='font-size:10.0pt;font-family:Wingdings;color:black'>*</span><span style='font-size:7.5pt;color:black'> <a href="mailto:eric.butcher@cdw.com" target="_blank">eric.butcher@cdw.com</a></span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:8.0pt;color:black'><a href="http://www.cdw.com/" target="_blank">http://www.cdw.com/</a></span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;color:black'>From:</span></b><span style='font-size:10.0pt;color:black'> <a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a> [mailto:<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>] <b>On Behalf Of </b>David Zhars<br><b>Sent:</b> Tuesday, November 23, 2010 1:11 PM<br><b>To:</b> <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br><b>Subject:</b> [cisco-voip] Dry Closure Phones</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='color:black'> <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='color:black'>An app we are installing at our Police Dept requires the phones to have a "dry closure" contact or something like that.<br>If I google this, I see a Dry Closure thing for 2600/3600 series, so I am researching that.<br>Do any phones supported by CCM 8 support dry closure? Ultimately, I want the phones to work with SRST, so I probably don't want to stray too far from the Cisco wagon...<br><br>Appreciate any insight.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;color:black'><br>_______________________________________________<br>cisco-voip mailing list<br><a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br><a href="https://puck.nether.net/mailman/listinfo/cisco-voip" target="_blank">https://puck.nether.net/mailman/listinfo/cisco-voip</a></span><span style='color:black'><o:p></o:p></span></p></div></div></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>
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