[cisco-voip] Latancy / Jitter

[Craig M Staffin]

Steven,

Take a look at Packeteer.  I have tested in the lab about 5% packet loss as
well as 200ms jitter and it still comes across crystal clear.  Now
obviously this not cisco supported but if it works thats all that matters.

Craig




                                                                           
             "STEVEN CASPER"                                               
             <SCASPER at mandtban                                             
             k.com>                                                     To 
             Sent by:                  Joe_Bell at adp.com,                   
             cisco-voip-bounce         cisco-voip at puck.nether.net          
             s at puck.nether.net                                          cc 
                                                                           
                                                                   Subject 
             06/21/2006 01:54          Re: [cisco-voip] Latancy / Jitter   
             PM                                                            
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




How about Max Jitter - we sometimes see as much as 50-60 ms though Avg
Jitter is low.

Steve

>>> "Bell, Joe" <Joe_Bell at adp.com> 06/21/06 1:14 PM >>>
According to the Enterprise QoS SRND page 1-13
(http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmi
gration_09186a008049b062.pdf), your spec's are:

Voice (Bearer Traffic)

A summary of the key QoS requirements and recommendations for Voice
(bearer traffic) are:

* Voice traffic should be marked to DSCP EF per the QoS Baseline and
RFC
3246.

* Loss should be no more than 1 %.

* One-way Latency (mouth-to-ear) should be no more than 150 ms.

* Average one-way Jitter should be targeted under 30 ms.

* 21-320 kbps of guaranteed priority bandwidth is required per call
(depending on the sampling

rate, VoIP codec and Layer 2 media overhead).

So, your latency is a tad bit high, but humans don't really notice it
until it is consistently above 200 ms.

Joe







________________________________

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Voll, Scott
Sent: Wednesday, June 21, 2006 9:58 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Latancy / Jitter



I'm looking at QoS stats from CM for phone calls.  Is this out of
recommended specs?



Jitter < 15

Lantancy < 175



Thanks



Scott



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