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Re: Questions about MPLS

  • From: Danny McPherson <danny@ambernetworks.com>
  • Date: Sat, 17 Mar 2001 14:24:52 -0700
  • Resent-Date: Sat, 17 Mar 2001 17:39:22 -0500
  • To: mpls-ops@mplsrc.com



> Variable length packets versus fixed length cells or 
> TDM timeslots is what leads to the jitter problem on 
> packet based circuit transport.

Sure, and this is one of the reasons ATM switching was
easy and fast.  Of course, in multi-service packet switched 
networks nodal jitter resulting from variable length packets
can be bounded with intelligent packet scheduling algorithms
such as DRR and CoS-based queuing.

Circuit emulation edge nodes (including TDM ones) employ 
elastics stores/jitter buffers for this purpose.

As for all the CCC stuff I've seen to date, it only 
accommodates packet-based services [at the moment], 
which is much simpler.

-danny

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