8
Delta modulation is an analog-to-digital and digital-to-analog signal conversion technique used for transmission of voice information where quality is not of primary importance.
Added 12/8/2014 3:51:43 AM
This answer has been confirmed as correct and helpful.
5
The public switched telephone network (PSTN) is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators, providing infrastructure and services for public telecommunication.
Added 12/8/2014 3:55:02 AM
This answer has been confirmed as correct and helpful.
Confirmed by
jeifunk [12/8/2014 4:13:53 AM]
5
On the public switched telephone network (PSTN), Signaling System 7 (SS7) is a system that puts the information required to set up and manage telephone calls in a separate network rather than within the same network that the telephone call is made on.
Added 12/8/2014 3:55:19 AM
