[comp.dcom.telecom] Phone system basics

sweedler@yale.UUCP (Jonathan Sweedler) (05/06/87)

Is there a good tutorial that explains the basics of the phone system.
I'm lost when people talk about DDD access trunks, SF tone detectors,
CCIS, ESS, and the like.  Thanks in advance.
-- 
UUCP:  ...!{seismo,decvax}!yale!sweedler  
ARPA:  sweedler@yale.arpa                          Jonathan Sweedler
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