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Cell Relay Retreat>List Archive>month:1998-Mar> msg00184



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Re: CBR quantity between PBXs

  • From: Alex Hardisty <alex@pqm-cons.demon.co.uk>
  • Date: Fri, 13 Mar 1998 09:11:17 +0000

In article <350832F6.276C@ctstateu.edu>, Richard A. Masselle
<masselle@ctstateu.edu> writes
>I plan to tie 2 pbxs together over ATM using Circuit emulation . The 
>question I have is concerning the correct quantity of Constant Bit Rate.
>The provider sells CBR in .5MB chunks. I planned for budget 1.5MB CBR
>for each T1 between pbxs. Is 1.5MB CBR = 1536000 ? Shouldn't I have
>1.544MB ? Or do you not need the extra 8000 for framing in this scenario
>? TIA

If your provider sells CBR in 0.5MB chunks then presumably you need 3 of
them.

Have you considered using VTOA as a means of reducing the bandwidth you
need to buy? What signalling is used between your PBXs?

Alex Hardisty
PQM Consultants, Suite C, 17 Moor Street, Chepstow, NP6 5DB, UK
tel: +44 1291 626 180 / fax: +44 1291 626 190
email: alex@pqm-cons.demon.co.uk www: http://www.pqm-cons.demon.co.uk/