History
n1878
The first exchange constructed in La Porte, the US
ncould
connect any two of the 21 subscribers
nmanual
switching (!)
n1890
first automatic exchange: Strowger Switch
nAlmon B.
Strowger: an undertaker in Kansas City
n1960s
and 1970s processor controlled, semi-automatic switches: Stored Program Control
(SPC)
nThis
allowed new functionality to be build into exchanges for
nsupervision
ncharging
ngathering
statistics