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<DIV><A
href="http://www.cisco.com/warp/public/788/AVVID/hook_switch.html">http://www.cisco.com/warp/public/788/AVVID/hook_switch.html</A></DIV>
<DIV> </DIV>
<DIV>in short,</DIV>
<DIV>
<H2><A name=intro>Introduction</A> </H2>
<P>A thorough analysis of a large number of Cisco IP Phones that have been
reported as hardware failures has been completed and our research reveals that
the great majority of these phones do not have any determinable failure. The
standard by which the phone industry measures phone failures is based on Bell
Corp/Telcordia standards and the standard acceptable failure rate is set at 4
percent. The Cisco IP Phone's overall failure rate is well under the acceptable
industry average. Many of the problems that have been reported as hardware
failures are really either operational or cleanup issues. This document
describes some common troubleshoot steps to be taken before you attempt to
replace the Cisco IP Phone.</P>
<H3><A name=contacts>Self Cleaning Hookswitch Contacts</A> </H3>
<P>The hookswitch contacts design uses a wipe action to self-clean the contacts.
Periods of nonuse of the phone allow air impurities such as dust and other
contaminants to hinder contact performance, which results in intermittent
operation. Press and release the hookswitch rapidly a dozen times or so to clean
the contacts.</P>
<P>If none of the solutions above remedy the situation, Return Material
Authorization (RMA) the phone.</P></DIV>
<DIV> </DIV>
<DIV>--------------------------------------------------------------------------------<BR>Lelio
Fulgenzi, B.A.<BR>Network Analyst (CCS) * University of Guelph * Guelph, Ontario
N1G 2W1<BR>(519) 824-4120 x56354 (519) 767-1060 FAX
(JNHN)<BR>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<BR>"I had a coffee and Coke at lunch today...and now, I've got more jitter than
an<BR>IP phone on a long haul 10base2
connection"
LFJ</DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=mfa@crec.ifas.ufl.edu href="mailto:mfa@crec.ifas.ufl.edu">Mike
Armstrong</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=cisco-voip@puck.nether.net
href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, August 31, 2005 4:25
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [cisco-voip] Hookswitch problems
on IP phones</DIV>
<DIV><BR></DIV>We're starting to see problems with the hookswitches on 7910
and 7940 <BR>phones. First occurrence was a couple of weeks ago, now 2
more in the last <BR>week. Is this a trend, I wonder? (Phones are
about 5 years old.) Symptoms <BR>are that when the phone is lifted
off-hook, the switch only goes off-hook <BR>for a brief instant, then goes
back on-hook. The caller only hears a brief <BR>click followed by a dead
line, and the callee gets a bum rap for hanging up <BR>on his callers.
One of my guys suspects the spring in there is weakening. <BR>Is anyone else
seeing similar problems?<BR><BR>Mike Armstrong<BR>UF/IFAS CREC<BR>Lake Alfred,
FL <BR><BR>_______________________________________________<BR>cisco-voip
mailing list<BR><A
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