Access control is usually one or two small units wired directly onto a door panel to control access to the door. There is no need for a PC network and you don't have to secure every single door within your building, only those you wish to , all electronics are installed in a keypad or reader - there are no additional components or peripherals, including extra wiring, routers, sensors and alarms.
The purpose of access control is to provide fast, convenient access control for authorized users Individuals, at the same time, restrict access to unauthorized people.