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<DIV dir=ltr><FONT size=2 face=Arial>Here's a reference I found --</FONT></DIV>
<DIV dir=ltr><A href="http://documents.exfo.com/appnotes/anote160-ang.pdf">http://documents.exfo.com/appnotes/anote160-ang.pdf</A></DIV>
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<DIV dir=ltr>I bet their CableSHARK ain't cheap...</DIV>
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<DIV dir=ltr>Here's another reference.</DIV>
<DIV dir=ltr><A href="http://support.avaya.com/css/P8/documents/100096307">http://support.avaya.com/css/P8/documents/100096307</A></DIV>
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<DIV dir=ltr>You could buy one of these:</DIV>
<DIV dir=ltr><A href="http://www.ebay.com/itm/VINTAGE-METRO-TEL-CORP-TELEPHONE-LINE-TESTER-VOLT-METER-/190554686851?pt=LH_DefaultDomain_0&hash=item2c5df1c583">http://www.ebay.com/itm/VINTAGE-METRO-TEL-CORP-TELEPHONE-LINE-TESTER-VOLT-METER-/190554686851?pt=LH_DefaultDomain_0&hash=item2c5df1c583</A></DIV>
<DIV dir=ltr>Or this:</DIV>
<DIV dir=ltr><A href="http://www.ebay.com/itm/TEMPO-SIDEKICK-7B-TELEPHONE-LINE-TESTER-/260885036727?pt=LH_DefaultDomain_0&hash=item3cbdf5beb7">http://www.ebay.com/itm/TEMPO-SIDEKICK-7B-TELEPHONE-LINE-TESTER-/260885036727?pt=LH_DefaultDomain_0&hash=item3cbdf5beb7</A></DIV>
<DIV dir=ltr>That's what the AT&T crews carry...</DIV>
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<FONT size=2 face=Tahoma><B>From:</B> Lelio Fulgenzi [mailto:lelio@uoguelph.ca]<BR><B>Sent:</B> Fri 11/4/2011 4:32 PM<BR><B>To:</B> Tim Reimers<BR><B>Cc:</B> cisco-voip@puck.nether.net<BR><B>Subject:</B> Re: [cisco-voip] Old cisco-voip thread on VG-224 dead ports<BR></FONT><BR></DIV>
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<DIV style="FONT-FAMILY: Verdana; COLOR: #000000; FONT-SIZE: 10pt">Thanks for sending this out Tim. I have been meaning to reply to it and am now just getting to it.<BR><BR>We're looking at replacing a few VG248s (EOL) and our legacy PBX with VG224s and some VIC3-2FXS-E/DID if required. The differences between the three devices is interesting:<BR>
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<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; WIDTH: 25%; BORDER-TOP: rgb(0,0,0) 1px solid">Model<BR></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; WIDTH: 25%; BORDER-TOP: rgb(0,0,0) 1px solid">DID Loop Resistance<BR></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; WIDTH: 25%; BORDER-TOP: rgb(0,0,0) 1px solid">FXS Loop Resistance<BR></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; WIDTH: 25%; BORDER-TOP: rgb(0,0,0) 1px solid">Loop Length<BR></TD></TR>
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<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid">VG248<BR></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid"><SPAN class=content>N/A</SPAN></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid"><SPAN class=content></SPAN><SPAN class=content>415 ohms (on-premise only)</SPAN></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid"><SPAN class=content>5000 feet</SPAN></TD></TR>
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<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid">VG224<BR></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid">N/A<BR></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid"><SPAN class=content>
<P style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; FONT-VARIANT: normal; FONT-STYLE: normal; TEXT-INDENT: 0pt; MARGIN: 3pt; FONT-WEIGHT: normal; TEXT-DECORATION: none" class=pChart_bodyCMT>Up to 600 ohm (including the phone or terminal equipment)</P></SPAN></TD>
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<P class=pB1_Body1><SPAN class=content>
<P style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; FONT-VARIANT: normal; FONT-STYLE: normal; TEXT-INDENT: 0pt; MARGIN: 3pt; FONT-WEIGHT: normal; TEXT-DECORATION: none" class=pChart_bodyCMT>3000 ft, 26 AWG</P></SPAN>
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<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid">VIC3-2FXS-E/DID</TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid"><SPAN class=content>
<P style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; FONT-VARIANT: normal; FONT-STYLE: normal; TEXT-INDENT: 0pt; MARGIN: 3pt; FONT-WEIGHT: normal; TEXT-DECORATION: none" class=pChart_bodyCMT>Up to 1800 ohms (including terminal equipment)</P></SPAN></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid"><SPAN class=content>
<P style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; FONT-VARIANT: normal; FONT-STYLE: normal; TEXT-INDENT: 0pt; MARGIN: 3pt; FONT-WEIGHT: normal; TEXT-DECORATION: none" class=pChart_bodyCMT>Up to 1400 ohms (including phone or terminal equipment)</P></SPAN></TD>
<TD style="BORDER-LEFT: rgb(0,0,0) 1px solid; BORDER-TOP: rgb(0,0,0) 1px solid"><SPAN class=content>
<P style="TEXT-ALIGN: left; TEXT-TRANSFORM: none; FONT-VARIANT: normal; FONT-STYLE: normal; TEXT-INDENT: 0pt; MARGIN: 3pt; FONT-WEIGHT: normal; TEXT-DECORATION: none" class=pChart_bodyCMT>Up to 11,000 feet (3.3 KM) 24 AWG Category 5 twisted pair cable</P></SPAN></TD></TR></TBODY></TABLE><BR></DIV>
<DIV style="MARGIN-LEFT: 40px"><SPAN></SPAN></DIV><SPAN id=7cfbb40c-a4b1-4204-bd00-d872375142d4><BR>I'm guessing the loop length provided is simply an estimate, since gauge (AWG) and number of splice points affects this sort of stuff and we really should be trying to match the FXS loop resistance to ensure we're falling in spec and can call for support accordingly. I'd rather not use any extra equipment installed in between if I can avoid it.<BR><BR>Anyone know what tools you can use to accurately measure the loop resistance? We're basically going to go to each circuit we have and decide if it falls within the VG224 specs or not since a 2911 with 4x</SPAN>VIC3-2FXS-E/DID has a port cost of about 4x that of a VG224.<SPAN id=7cfbb40c-a4b1-4204-bd00-d872375142d4> <BR><SPAN name="x"></SPAN>---<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 (ANNU)<BR>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<BR>Cooking with unix is easy. You just sed it and forget it. <BR> - LFJ (with apologies to Mr. Popeil)<BR><SPAN name="x"></SPAN><BR></SPAN><BR>
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<B>From: </B>"Tim Reimers" <treimers@ashevillenc.gov><BR><B>To: </B>cisco-voip@puck.nether.net<BR><B>Sent: </B>Saturday, October 22, 2011 6:18:10 PM<BR><B>Subject: </B>[cisco-voip] Old cisco-voip thread on VG-224 dead ports<BR><BR>
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<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">I was looking around for some info</SPAN></DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">on VG-224 ports, and found this archived thread on Gossamer from 2008..</SPAN></DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt"></SPAN> </DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt"><A href="http://www.gossamer-threads.com/lists/cisco/nsp/96100" target=_blank>http://www.gossamer-threads.com/lists/cisco/nsp/96100</A></SPAN></DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt"></SPAN> </DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">I have a bit of info to offer on this one - although it doesn't help my problems.</SPAN></DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt"></SPAN> </DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">An old tip-and-ring PBX tech told me that in his experience, you can often get this behaviour from devices (ports, station extensions, etc in his world) when the line length is too long, and the impedance is very out of range.</SPAN></DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt"></SPAN> </DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">He says that can make ports behave badly and do this kind of thing, or blow outright from trying to match the impedance of the line.</SPAN></DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt"></SPAN> </DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">There are devices that can present the needed 600 ohm impedance to the VG-224 and stabilize this -</SPAN></DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">Unfortunately, I am not enough of a line tech to know whether I'm seeing the right thing or not - maybe someone else knows of such a product by the correct part number from some manufacturer..</SPAN></DIV>
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<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">This makes for some interesting reading --</SPAN></DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt"><A href="http://www.sandman.com/loop.html" target=_blank>http://www.sandman.com/loop.html</A></SPAN></DIV>
<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">although it's pretty simple and sales oriented..</SPAN></DIV>
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<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt">I have a VG-224 with some blown ports, but I can't find anything on VG-224 port repair, other than sending it to Cisco..</SPAN></DIV>
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<DIV dir=ltr><SPAN style="COLOR: black; FONT-SIZE: 10pt"></SPAN> </DIV></DIV><BR>_______________________________________________<BR>cisco-voip mailing list<BR>cisco-voip@puck.nether.net<BR>https://puck.nether.net/mailman/listinfo/cisco-voip<BR></DIV></DIV></BODY></HTML>