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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=309133213-14102005>It
depends on what you call "4-wire". In the traditional sense, when someone
says "2-Wire E&M" they are only talking about the audio path. "4-wire
E&M" uses 2-pair to transport duplex audio, Tip,Ring,
tip1,ring1.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=309133213-14102005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=309133213-14102005>Type 1
E&M assumes you are using 2-wires for signaling.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=309133213-14102005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=309133213-14102005>Cheers,<BR>Eric</SPAN></FONT></DIV>
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<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net]
<B>On Behalf Of </B>Bob A. Bowie<BR><B>Sent:</B> Friday, October 14, 2005
12:42 AM<BR><B>To:</B> cisco-voip@puck.nether.net<BR><B>Subject:</B>
[cisco-voip] E&M Type I question<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Can someone tell me on a T1 trunk, with E&M
Type 1 with 4 wire, does</FONT></DIV>
<DIV><FONT face=Arial size=2>the signalling for all 24 ds0's happen on two of
the wires and the audio is on the</FONT></DIV>
<DIV><FONT face=Arial size=2>other two wires?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks</FONT></DIV></BLOCKQUOTE></BODY></HTML>