Interlogix CDC4 Installation And Programming Manual page 111

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Input shunting & DOTL: The door will be shunted and will generate a DOTL
(Door Open Too Long) alarm if it is left open (i.e. Door input 1 is active) longer
than the programmed Shunt time (or Ext. shunt time, if applicable).
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Auto shunting & DOTL: If the areas assigned to the door are in access
(disarmed), shunting of the door will commence when the Door input 1 is
active. No card or PIN is required. A DOTL alarm is generated if it is left open
longer than the programmed Shunt time.
Shunt time
Program the amount of time that the door may be opened for without causing an
alarm (shunted). This allows time for a user to pass through the door and shut it
again.
Enter the time in seconds.
Ext. shunt time
Program the amount of time for the door to be shunted when a user, with the
"Use extended shunt time" flag enabled, presents a valid card or PIN at the door
reader.
Enter the time in seconds.
Shunt warning
Program the amount of time for an output to activate, to sound a warning device,
before the Shunt time (or Ext. shunt time, if applicable) expires.
Enter the time in seconds.
Shunt until door closes
Select this option to ignore the programmed Shunt time (or Ext. shunt time), and
to shunt Door input 1 until the door closes (the door input is deactivated).
Cancel shunt after door closed
For security reasons, it may be required to limit the shunt period as much as
possible in order to detect the door being opened again during the shunt time
(after the debounce time of approximately 2 seconds).
Select this option to use the programmed Shunt time (or Ext. shunt time) to shunt
Door input 1 and then to cancel the shunt when the door closes (the door input is
deactivated).
Anti-passback options
The anti-passback options control the operation of the reader if a card or PIN is
used to enter the same region that the user is currently in.
This is valid only when a region is programmed for the door. See the "In region"
section on page 106 and the "Out region" section on page 106.
Anti-passback violation is reported to management software.
CDC4 Door Controller Installation and Programming Manual
Chapter 4: Menu reference
105