Picture Perfect 4.6 User Manual - UTCFS Global Security Products

Chapter 9
Area management
169
Note:
If a badge's currently-recorded area and the From area (of the reader that the badge is being used at) get out of
sync, either because of some violation of the system (e.g. a person has previously climbed over a turnstile) or for
a legitimate reason (for example, a person has passed through a fire exit during a fire drill), some means is
required to bring the two back into sync. This can be accomplished from the Person form by resetting the last
access area to NEUTRAL, so that the next transaction at a nested anti-passback reader is always accepted
without violation, and the reader's To area becomes the badge's new area.
To accommodate different performance requirements, the system supports two methods of obtaining
the Nested APB status of a badge before allowing access. These methods are only to support the
Nested APB feature (available on the Reader form when the reader is the Global Nested APB type).
• Host Broadcasts to Controllers
This method broadcasts the badge’s last access area status to all associated controllers for
each incoming valid APB legacy and nested transaction at the host; this is primarily used for
individual, high-traffic readers that need to avoid longer wait times.
• Controller Requests from Host
This method relies on the controllers requesting the badge’s last access area status on a pertransaction
basis before evaluating access; this involves less overhead (network traffic) at the
host, but imposes a longer wait time at the reader for the badge holder if the host is
processing many learn requests at that time.
To accommodate different offline behaviors when using the Controller Requests from
Host method, the Fail Safe and Fail Secure modes of operation can be configured on a
per reader basis for readers that have been configured for Global Nested APB
operations. If the controller has lost communication with the host and the reader is
configured for Fail Secure, no access is granted at nested APB readers. If the controller
has lost communication with the host and the reader is configured for Fail Safe, access is
granted based on categories but not based on the From area.
Figure 75.Anti-passback example transactions