Some features of PSTN of ´60 (cont.)
nNetwork intelligence and value-added service
nnot supported as such
noperators were anyhow intelligent :)
nvalue added services by tracking what happens in the area!
nInter-exchange signaling
ncall setup took about 15 seconds
nchannel-associated signaling
nabout 10% of trunk line capacity was taken by signaling
nOperation and maintenance
nusing local info-bases and local workforce
nnetwork maintenance was based on on-field check-ups