CEM Dejitter Buffer

Unanswered Question
Oct 21st, 2008

I came across a CEM port whose Dejitter buffer size is set to 60 and the Dejitter buffer level max was 64....How is that possible?

I have this problem too.
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Giuseppe Larosa Wed, 10/22/2008 - 12:31

Hello James,

Setting the Dejitter Buffer Size

To specify the size of the dejitter buffer used to compensate for the network filter, use the dejitter-buffer size command. The configured dejitter buffer size is converted from milliseconds to packets and rounded up to the next integral number of packets. Use the size argument to specify the size of the buffer, in milliseconds. The range is from 1 to 500 ms; the default is 5 ms.

see

http://www.cisco.com/en/US/docs/interfaces_modules/shared_port_adapters/configuration/7600series/SRC1/76cfgcep.html#wp1585001

so the value is to be seen as msecs and I share your concerns

Hope to help

Giuseppe

jdreed2829 Mon, 11/17/2008 - 09:21

So the Max level size is a rounded number of packets where as the Buffer size is a Manually entered number??

Giuseppe Larosa Mon, 11/17/2008 - 14:01

Hello James,

being a command expressed as msecs of traffic you cannot compare directly the two numbers:

60 ms of traffic should be in packets much more then 64 and this should explain why that CEM configuration is possible

Hope to help

Giuseppe

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