1. It takes time for one person to enter the door with a biometric reader. Fingerprint account is usually combined with a users card, and iris recognition also takes time, so the main question is, how many people use that door per minute.
2. Fingerprint is recognized by the number of matching minutiae (http://en.wikipedia.org/wiki/Fingerprint_recognition), and the result of each reading is a certain number, that varies as a result of temperature, humidity, user behavior, etc.
You got to find a fine compromise between having a secure scanner, and not making a queue at the door.
If the access system is too tough on users, they will seek a way to bend the rules, by leaving the door open, or giving pass for more people at the same time.
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Such a system refers to one that uses a password to open or close specific doors using a password. Without the correct password, the door will not open.
Put the key in the alarm disable lock and turn. There are two types of door systems. One as above, which is a free standing door system and the other where the door is tied into the buildings alarm system. In both cases the person that looks after the buildings security has to be notified. They will use a key that they keep and disarm the door for you. This security person also has the ability to lock the door alarm out of the buildings security system if that is the type of system used. Usually you have to sign a paper as to why the door open request was made and when you finish the time the door was brought back on line.
A garage door opener works by using a small, electric motor to lift a rolling door assembly. The motor uses a chain or series of gears to control the opening and closing of the door.
Push the lever and the door will open.
The intercom system is a communication system. You need a electric circuit, transistors and the door bells to assemble it at home.