TELECOMMUNICATIONS

[vc_row][vc_column][vc_single_image image=”4147″ img_size=”large”][/vc_column][/vc_row][vc_row][vc_column width=”1/2″][vc_column_text]Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. Prior to ISDN, the telephone system was viewed as a way to transport voice, with some special services available […]