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Access Control Locksmith San Diego, Ca
Access control is a system which enables an authority to control access to areas and resources in a
given physical facility or computer-based information system. An access control system, within the field
of physical security, is generally seen as the second layer in the security of a physical structure.
Access control is, in reality, an everyday phenomenon. A lock on a car door is essentially a form of
access control. A PIN on an ATM system at a bank is another means of access control. Bouncers
standing in front of a night club is perhaps a more primitive mode of access control (given the evident
lack of information technology involved). The possession of access control is of prime importance
when persons seek to secure important, confidential, or sensitive information and equipment.
Access control system components
An access control point, which can be a door, turnstile, parking gate, elevator, or other physical barrier
where granting access can be electrically controlled. Typically the access point is a door. An electronic
access control door can contain several elements. At its most basic there is a stand-alone electric lock.
The lock is unlocked by an operator with a switch. To automate this, operator intervention is replaced by
a reader. The reader could be a keypad where a code is entered, it could be a card reader, or it could
be a biometric reader. Readers do not usually make an access decision but send a card number to
an access control panel that verifies the number against an access list. To monitor the door position a magnetic door switch is used. In concept the door switch is not unlike those on refrigerators or car doors. Generally only entry is controlled and exit is uncontrolled. In cases where exit is also controlled a second reader is used on the opposite side of the door. In cases where exit is not controlled, free exit, a device
called a request-to-exit (REX) is used. Request-to-exit devices can be a pushbutton or a motion detector.
When the button is pushed or the motion detector detects motion at the door, the door alarm is temporarily ignored while the door is opened. Exiting a door without having to electrically unlock the door is called mechanical free egress. This is an important safety feature. In cases where the lock must be electrically unlocked on exit, the request-to-exit device also unlocks the door.
This is a Typical Access Control System