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Usual problems

spaceage security systems

An access control system can fail to perform its desired function in either of two ways: It can admit a person who should not have been admitted (a False-Accept Error), or it can deny admittance to a person who should have been admitted (a False-Reject Error).

The principal purpose of any access control system is to prevent false-accept errors, but it will not be acceptable to accomplish this while having a number of false-reject errors. The performance of automatic control systems, as measured by false-accept and false-reject errors, varies with the technology used and the wear-tear of the cards.

The most common Access control system is the Card-based system. The Card based system consists of a Card Reader that is installed on the door and credit-card sized cards that the authorized individuals have to carry with them. The card reader reads the data from the card presented to it and if the data is valid then gives a command to unlock the electric lock on the door for a limited duration otherwise denies access. The Card reader can also log this information of who was admitted and at what time in it's own memory or a PC to which it may be connected. Another advantage of card access is in the programming of the user access. A card can be programmed to allow access only during certain hours and deny after hours access. Reports can be produced based on this data. Another major advantage of Card Access Control System is that the cards can be easily revoked. Such a system pays for itself quickly due to less involvement of security persons as well as enhanced security.

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