Re: Re-engineering the public switched network

[David Lesher <wb8foz@nrk.com>]

  > 1.    I thought the D channel was already used on a POTS line, anyway...
  
  The D is dual function:
  
  	1)Call setup & knockdown & such:	everyone
  
  	2)Packet data tranmission:		If the CO is so
  						equipped & you pay
  						Ma enough...
  
  > 2.    In a somewhat different vein... aren't the B channels derived channels,
  > and if so, is there anything magic about 56 or 64 kbps?  
  
  The standard digital interoffice channel (aka a DS0) is 64kbs.
  There have to be several zillion of these installed. Every time
  you make an inter-office phone call you use one+ of 'em.  
  
  The 56 figure came from an old method of call mgmt where Ma used
  the [64-56=8k] for their own overhead.
  
  
  > What if there
  > were lots of 9.6 kbps derived channels. and you only used as many as you 
  > needed, at that time.... they everyone with an open connection would be 
  > using at most about 17 percent of what a POTS line uses now, for 
  > interoffice trunkage....  
  
  Alas, this would require a ground-up reengineering of the nation's
  circuit switching...
  
  
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