Re: satisfied customer

[David Lesher <wb8foz@nrk.com>]

  > Nonetheless, I gather there is agreement that 28.8 Kbps modems
  > are as "digital" as ISDN "modems."
  Errr not at all...
  
  > There was an argument that ISDN traffic moved by a digital network
  > between COs while voice traveled by an analog route -- but given
  > the statements that almost all inter-office voice is handled by
  > the "digital network", this distinction, apparently, does not hold.
  THAT is true. Virtually all inter-office traffic is digital & in DS0
  format. You'd be very hard-pressed to tell the difference between POTS
  voice (digitized at the CO), ISDN voice (digitized at the CPE), ISDN
  voice carrying 28,8 modem traffic (starts digital, turned to analog by
  the modem, turned back into digital at the CPE), & ISDN data (digitized
  not at all...).
  
  > So when we compare 28.8 to ISDN we really are talking about comparing an
  > unconditioned local line with a conditioned local line with repeaters
  > (if necessary).  Once at the CO both data travel digitally.
  True. But not all local ISDN loops are "conditioned" -- the design goal
  was to use the ""average"" drop.
  
  > Does anyone know if there are inherent advantages, efficiencies in
  > using ISDN vis a vis a 28.8 modem where the connection is made
  > at the CO?
  Connection to 'what' at the CO?
  
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