Anti-passback is a security feature in access control systems that prevents users from gaining access to a secured area twice with a single authorization.
In an access control system with anti-passback enabled, a user's access credential is only valid for one entry to a specific area. When the user enters that area, the system records the time and location of the entry, and the credential is "checked out" by the system. The user must then exit the area using an authorized exit point, which the system also records. Once the user has exited, the credential is "checked in" by the system and is once again available for use.
If the user attempts to gain access to the area again without first exiting through an authorized exit point, the system will deny the access request, triggering an alarm or alert to notify security personnel of the unauthorized attempt.
The anti-passback feature helps to prevent unauthorized access and ensures that individuals cannot enter an area using someone else's credentials or by tailgating through a door without first exiting through the same door. This feature is particularly useful in high-security environments, such as data centers, research labs, and financial institutions, where access control is critical to maintaining the confidentiality, integrity, and availability of sensitive data and assets.
There are two types of anti-passback systems: "hard" and "soft."
Hard Anti-passback: This type of anti-passback is a physical implementation that prevents a user from entering a restricted area again until they have exited through a designated exit point. Hard anti-passback requires the use of sensors or other physical devices to track when a user enters and exits a secure area. Once a user has entered a secure area, they cannot re-enter until they have exited through a designated exit point. This type of anti-passback is typically used in high-security areas, such as data centers or research labs.
Soft Anti-passback: This type of anti-passback is a logical implementation that uses software to enforce anti-passback policies. Soft anti-passback is more flexible than hard anti-passback and allows for exceptions and can be adjusted as needed. Soft anti-passback is often used in commercial or industrial settings where security requirements may be less stringent.
Both hard and soft anti-passback systems help to ensure that only authorized individuals are able to access restricted areas and that they do so in a controlled and secure manner.
Timed Anti-Passback: This is another type of anti-passback system in access control that restricts a user from entering a secure area again for a specified period of time, regardless of whether an exit reader is present or not.
With timed anti-passback, once a user has entered a secure area, they are not allowed to re-enter that same area using the same access credential (such as a card or PIN) for a set period of time, even if they have not yet exited the area. This helps to prevent "piggybacking," where a second person tries to enter a secure area using the same access credential as the first person.
Timed anti-passback is often used in areas where there is a high risk of security breaches or where there is a need to closely monitor access, such as in data centers, laboratories, or other secure facilities. By limiting the frequency of access for each user, timed anti-passback can help to prevent unauthorized access and ensure that only authorized individuals are able to enter and exit a secure area.
Local Anti-Passback: This is another type of anti-passback system in access control that works individually for each controller in an access control system.
Each controller in the system covers access for a few doors, and with Local APB, you can set different anti-passback rules for different controllers. For example, you can set hard anti-passback for the doors under Controller A and soft anti-passback for the doors under Controller B. This allows for more flexibility and customization in access control policies.
Overall, local anti-passback is a useful feature for access control systems, particularly in large or complex environments where different areas may require different levels of security or access control policies.
Global Anti-Passback: This is another type of anti-passback system in access control that works similarly to Local Anti-Passback, but with a universal application across all controllers in the system.
With Global APB, the anti-passback rule applies to all controllers in the access control system. This can be useful for ensuring consistency in access control policies and security measures across all areas and doors in the system.
Like Local APB, Global APB also has the facility to reset the rule for users as needed. This allows administrators to make changes to the anti-passback policies and adjust access control measures as required to meet changing security needs.
Overall, Global Anti-Passback is a powerful feature for access control systems, particularly in large or complex environments where a consistent approach to security and access control policies is important.
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