Building Auto- Voice-Data-Video (VDV) System Control Devices and Applications Exam (GRADED A).

Building Auto- Voice-Data-Video (VDV) System Control Devices and Applications Exam (GRADED A). Voice-Data-Video (VDV) systems include: Telephony, data network, and closed-circuit television (CCTV) systems. Public Switched Telephone Network (PSTN) A network of telephone exchanges that can be connected together to make a continuous circuit for each telephone call. Private Branch Exchanges (PBXs) connect in-house telephones together within a private network and manage the telephones' access to the Public Switched Telephone Network (PSTN). Voice over IP (VoIP) systems use special telephones that convert voice audio into packets of digital information to be transmitted over the internet. The simplest CCTV system consists of: just a camera and a monitor, although most systems also include a recording device. DTMF tones each telephone keypad digit responds to a pair of DTMF tones.