Network access control systems based on Big Brother, ACS are designed to provide control and access control on objects of various sizes (banks, institutions, schools, businesses, hotels, etc.). This implies the integration of all the access points of the building entering system into single management system. The server part of the software can be situated on a normal user PC, to which all devices of the system are connected using the interface converter. This solution allows one to manage access in enterprises with a large number of employees and visitors, namely: monitor events and control access of employees to certain premises, add new users, organize and record working hours, manage remote sites from one workplace and monitor their status. Besides that these systems allow one to put personnel management at a higher level, improve discipline and productivity in addition to security and information.