
Jamadagni H S DC/V1/2004 2
z
Manual - through operator 1880 onwards
z
Step-by-Step Strowger ~1897
z
First "big" strowger exchange 1919
z
# 1 Cross bar 1938
z
# 5 Cross bar 1948
z
# 3 Cross bar 1974
z
ESS I 1965
z
ESS II 1970
z
ESS III 1976
z
ESS ZB 1976
z
ESS IA 1980 onwards
PAX : Private automatic exchange useful for local connections
only
PABX: Private automatic branch Exchange useful for local and
trunk connections
History of Switching
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