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<title>IAD 2420 - modem dial out issue</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Are you saying that the modem application
works okay when the IAD is connecting to your stackables but not the 6500, or
doesn’t work in either situation? Has it ever worked? For the
below, I am assuming the behavior is similar regardless of the data switch
connectivity.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>While the duplex issue is something to get
worked out (have you tried forcing both sides to full-duplex?) I am also
curious about what type of modems you are using (i.e. V.34) and what connection
speeds you are attempting. Generally you start to get into trouble at
speeds above 14.4kbps, at least in my experience. I assume you are using
the FXS ports on the IAD to connect analog modems at the head end, and then
traversing via voip to the 3725 PRI. What sort of codec is configured in
use between these two endpoints? And finally, have you looked into configuration
of “modem passthrough” (not sure how well the IADs support this)?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b><span
style='font-weight:bold'>On Behalf Of </span></b>John Kienzle<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, November 29, 2005
9:36 AM<br>
<b><span style='font-weight:bold'>To:</span></b> cisco-voip@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> [cisco-voip] IAD 2420 -
modem dial out issue</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Hello.</span></font>
<o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Our
company uses analog lines for fax and modem dial out provided by an IAD 2420
which is connected to a 3725 router handling our PRI T1 phone trunks. Incoming
and outgoing faxes work fine, the numbers associated to the IAD all work ok -
we can make and receive calls. The problem we are experiencing is this - we
have a couple workstations with modems that call out to gas control meters in
the field and retrieve data. There are 2 types of collection performed. One
retrieves the current status and another retrieves monthly historical data. The
status data always collects fine. The historical data, which is a larger amount
of data, does not collect. There is usually some kind of CRC error or character
timeout error reported by the software. We have verified it is not related to
the equipment in the field, as it works just fine over a standard 1FB analog
line. Just not through our IAD. Recently we migrated from catalyst 2924 and
3524 switches to a 6509 running IOS. I have since put the IAD back to the 2924
where it was originally connected. Our IP Address network has also changed, but
the collection has been working fine after that migration. </span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>One
thing I have noticed is that the IAD appears to only run 10 meg half-duplex
from its Ethernet port. Thus, I have noticed collisions and deferred packets on
the E0 interface and the switchport, which I would probably expect from
half-duplex ethernet operation. I have tried forcing full duplex on the IAD
Ethernet port, but the switch still shows it connected as half-duplex.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Does
anyone have ideas on other areas I might look for answers related to this
issue? Could it be a Qwest (PRI provider) issue with our PRI? I may open a TAC
case, but thought I'd try this forum first.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks.</span></font>
<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 color=teal face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;color:teal'>John Kienzle</span></font> <br>
<font size=2 color=teal face=Tahoma><span style='font-size:10.0pt;font-family:
Tahoma;color:teal'>Western Gas Resources</span></font> <br>
<font size=2 color=teal face=Tahoma><span style='font-size:10.0pt;font-family:
Tahoma;color:teal'>Field Support Analyst</span></font> <o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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