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<p style='margin-left:.25in'><font size=1 face=Arial><span style='font-size:
9.0pt'>According to the Enterprise QoS SRND page 1-13 (<font color=navy><span
style='color:navy'>http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigration_09186a008049b062.pdf</span></font>),
your spec’s are:<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=2
face=Univers-CondensedBold><span style='font-size:10.5pt;font-family:Univers-CondensedBold;
font-weight:bold'>Voice (Bearer Traffic)<o:p></o:p></span></font></b></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Times-Roman><span
style='font-size:10.0pt;font-family:Times-Roman'>A summary of the key QoS
requirements and recommendations for Voice (bearer traffic) are:<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=1
face=Univers-CondensedBold><span style='font-size:9.0pt;font-family:Univers-CondensedBold;
font-weight:bold'>• </span></font></b><b><font size=2 face=Times-Bold><span
style='font-size:10.0pt;font-family:Times-Bold;font-weight:bold'>Voice </span></font></b><font
size=2 face=Times-Roman><span style='font-size:10.0pt;font-family:Times-Roman'>traffic
should be marked to </span></font><b><font size=2 face=Times-Bold><span
style='font-size:10.0pt;font-family:Times-Bold;font-weight:bold'>DSCP EF </span></font></b><font
size=2 face=Times-Roman><span style='font-size:10.0pt;font-family:Times-Roman'>per
the QoS Baseline and RFC 3246.<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=1
face=Univers-CondensedBold><span style='font-size:9.0pt;font-family:Univers-CondensedBold;
font-weight:bold'>• </span></font></b><b><font size=2 face=Times-Bold><span
style='font-size:10.0pt;font-family:Times-Bold;font-weight:bold'>Loss </span></font></b><font
size=2 face=Times-Roman><span style='font-size:10.0pt;font-family:Times-Roman'>should
be no more than </span></font><b><font size=2 face=Times-Bold><span
style='font-size:10.0pt;font-family:Times-Bold;font-weight:bold'>1 %.<o:p></o:p></span></font></b></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=1
face=Univers-CondensedBold><span style='font-size:9.0pt;font-family:Univers-CondensedBold;
font-weight:bold'>• </span></font></b><font size=2 face=Times-Roman><span
style='font-size:10.0pt;font-family:Times-Roman'>One-way </span></font><b><font
size=2 face=Times-Bold><span style='font-size:10.0pt;font-family:Times-Bold;
font-weight:bold'>Latency </span></font></b><font size=2 face=Times-Roman><span
style='font-size:10.0pt;font-family:Times-Roman'>(mouth-to-ear) should be no
more than </span></font><b><font size=2 face=Times-Bold><span style='font-size:
10.0pt;font-family:Times-Bold;font-weight:bold'>150 ms</span></font></b><font
size=2 face=Times-Roman><span style='font-size:10.0pt;font-family:Times-Roman'>.<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=1
face=Univers-CondensedBold><span style='font-size:9.0pt;font-family:Univers-CondensedBold;
font-weight:bold'>• </span></font></b><font size=2 face=Times-Roman><span
style='font-size:10.0pt;font-family:Times-Roman'>Average one-way </span></font><b><font
size=2 face=Times-Bold><span style='font-size:10.0pt;font-family:Times-Bold;
font-weight:bold'>Jitter </span></font></b><font size=2 face=Times-Roman><span
style='font-size:10.0pt;font-family:Times-Roman'>should be targeted under </span></font><b><font
size=2 face=Times-Bold><span style='font-size:10.0pt;font-family:Times-Bold;
font-weight:bold'>30 ms</span></font></b><font size=2 face=Times-Roman><span
style='font-size:10.0pt;font-family:Times-Roman'>.<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><b><font size=1
face=Univers-CondensedBold><span style='font-size:9.0pt;font-family:Univers-CondensedBold;
font-weight:bold'>• </span></font></b><b><font size=2 face=Times-Bold><span
style='font-size:10.0pt;font-family:Times-Bold;font-weight:bold'>21–320
kbps of guaranteed priority bandwidth is required per call </span></font></b><font
size=2 face=Times-Roman><span style='font-size:10.0pt;font-family:Times-Roman'>(depending
on the sampling<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Times-Roman><span
style='font-size:10.0pt;font-family:Times-Roman'>rate, VoIP codec and Layer 2
media overhead).</span></font><font size=2 face=Univers-CondensedBold><span
style='font-size:10.0pt;font-family:Univers-CondensedBold'><o:p></o:p></span></font></p>
<p style='margin-left:.25in'><font size=1 face=Arial><span style='font-size:
9.0pt'>So, your latency is a tad bit high, but humans don’t really notice
it until it is consistently above 200 ms.<o:p></o:p></span></font></p>
<p style='margin-left:.25in'><font size=1 face=Arial><span style='font-size:
9.0pt'>Joe<o:p></o:p></span></font></p>
<p style='margin-left:.25in'><font size=1 face=Arial><span style='font-size:
9.0pt'><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'><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>Voll, Scott<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, June 21, 2006
9:58 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] Latancy /
Jitter</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m looking at QoS stats from CM for phone
calls. Is this out of recommended specs?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Jitter < 15<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Lantancy < 175<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Scott<o:p></o:p></span></font></p>
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