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Special PACS Use Cases
Two Person Control
Areas that fall under two-person control rules face a different set of challenges. In such areas, the PACS
must require that two individuals present their credentials and that both persons do indeed have access
authorization to enter the secured space.
The difference in application requires the PACS logic to include the additional internal steps in the access
As the term implies, the PACS must only release the door (or other opening) after two individuals have
presented credentials. Each person may be required to present and validate a card (possession) PIN
(knowledge) and/or biometric (physical attributes) for system authentication. [Refer: Section 2:
Credentials]. Regardless of the number of authentication factors required for each person, validation /
authorization must be acquired for each person before the system will grant access and release the opening.
Examples of where this could be deployed include Customs areas, where there are goods owners or shippers
as one entity and customs agents representing the second.
Some variations may include two readers separated by some distance controlling the same access control
point. In this case, the two authorized persons must present their credentials simultaneously at their
Just like deploying access control technologies at a door, or other portal, elevators are a different method
by which people may enter restricted areas.
Just like a door or portal may be a point that connects open, public space to other areas where access is
limited and may be controlled by access control technology an elevator may also connect open, public
spaces to restricted areas. However, the process of controlling and restricting access to different floors while
allowing public unrestricted travel between open floors presents a series of different challenges of the PACS
equipment and system designers.
Airports facilities often face these challenges as the traveling public is allowed to use elevators to go
between open, public floors, but not to levels where an elevator stops at a restricted area.
To decide what method of access control is most appropriate, system designers must develop a clear
understanding of the traffic flow of both people and goods. How much traffic is restricted vs. how much
traffic is represented by the travelling public, how many floors are restricted and who have access privileges
to travel to the restricted floors, are the restrictions based on a floor to floor basis such as each floor requires
separate authorization vs. authorization to travel to any of the controlled floors?
Elevator control operational parameters must be identified and agreed upon before a PACS approach can
be determined. Following are different scenarios:
It is unfortunately common that an elevator serves a small number of restricted as well as
unrestricted floors. In these deployments, the restricted floor selection buttons inside the elevator
car are disabled. Only the non-restricted floor selection buttons are enabled and anyone can select
these floors and ride the elevator as normal.
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