Some features of PSTN of ´60 (cont.)
			n Network intelligence and value-added services n not supported as such n operators were anyhow intelligent :) n value added services by tracking what happens in the area! n Inter-exchange signaling n call setup took about 15 seconds n channel-associated signaling (CAS: No.5, R1,R2*) n about 10% of trunk line capacity was taken by signaling n Operation and maintenance n using local info-bases and local workforce n network maintenance was based on on-field check-ups