What is ISDN
1 min readMar 25, 2017
Integrated Services Digital Network (ISDN) is comprised of digital telephone and data transport services offered by regional telephone carriers. ISDN involved the digitization of the telephone network, which permits voice, data text graphics music video, and other source material to be transmitted over existing telephone wires.
Read more visit — http://www.sseducationlab.in/2017/03/17/what-is-isdn/
