The key to the success of the system is the integration of several subsystems, with a minimum number of visual monitorings, a minimum number of operations, and a maximum amount of pertinent information presented to the operator. The major components of the system are intercoms (audio), closed circuit television surveillance, card access control, personal alarm transmission, fire alarm, door control (locks), a host computer, and the operators. The advantage of the card access control is that the card can be taken out of service if it is lost or stolen by inmates. As inmates approach each security door, they press the call button at the door. A door call is presented to the operator in central control. Simultaneously, a television picture of the door is shown to the operator, and the intercom station beside the call button is connected to the operator's intercom or head set. The operator can talk to the inmates and permit or deny the door access as needed. Personal alarm transmitters are assigned to each staff member at the beginning of each shift. Overall, the system increases security and the speed of staff response to incidents without increasing staff.