HUT Comms Lab., Timo O. Korhonen
History
n1876 A. G. Bell telephone patent
n1878 The first exchange constructed in La Porte, the US
ncould connect any two of the 21 subscribers
nmanual switching (!)
n1891 first automatic exchange: Strowger Switch by Almon B. Strowger: an undertaker in Kansas City
nA 100 line
Strowger switch:
neach user has its
own selector
nno concentrators
nexpensive
Strowger switch
Text Box: via selectors
via selectors