What is Integrated Service Digital Network (ISDN)?
Integrated Service Digital Network (ISDN) is a set of communication standards that allow the transmission of voice, video, and data across traditional Public Switched Telephone Networks (PSTN). It was developed to improve the speed and quality of data transfer over conventional telephone lines by digitizing the transmission. ISDN provides end-to-end digital connectivity and supports multiple digital channels for simultaneous communication.
In the context of security systems, ISDN can be used for connecting alarm systems, video surveillance, and monitoring equipment to central monitoring stations. For example, ISDN enables faster data transfer for video feeds from surveillance cameras to be reviewed in real time, enhancing response capabilities in home and business security setups.
ISDN operates through two main types of channels: the B (Bearer) channel for data and voice transmission and the D (Delta) channel for control and signaling. These channels ensure that data-intensive security applications, like high-definition video surveillance and remote access control systems, operate smoothly without interruptions.
Although ISDN has been largely replaced by newer technologies like broadband and fiber-optic connections, it remains a relevant option for certain remote or legacy systems where modern infrastructure may not be readily available.