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Re: IP: Pac Bell says Net use may collapse phone system

  On Mon, 28 Oct 1996, Fred R. Goldstein wrote:
  > Yes, in the sense that the network (resi and others all together) is
  > designed with the expectation that around 10% of the resi lines are in use
  > at once.
      Again, you have qualified this extensively, and I appreciate that.
  But as a crude first approximation,,,, do you see our point?  If the 
  ISP's only have one incoming line per every 10 to 20 customers, I don't 
  see how the internet users differ that much in peak patterns from the 
  voice network.  jamie
  > Essentially, you take the number of resi lines and multiply by the average
  > CCS of the resi lines, the number of business lines times the average CCS of
  > business lines (which is higher than for resi), the number of trunks times
  > around 30 CCS (mostly busy), and add it all up.  Thus a CO in a
  > business-heavy area will typically be designed for a higher CCS/line number
  > than one in a bedroom community.
  > But that's only a first-guess estimate.  In practice, engineering a real CO
  > is done one at a time, based on experience.  In other words, when it's
  > running out of room, you add more.  The problem is that recent growth has
  > been fairly rapid, and telcos plan growth on a 5-10 year planning cycle.
  > ___
  > Fred R. Goldstein      fgoldstein@bbn.com  
  > BBN Corp.              Cambridge MA  USA    +1 617 873 3850
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