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Security & Surveillance Solutions - Protecting People and Property |
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Glossary of Security Terms |
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| Glossary:
CCTV | Access Control | Access Control Card |
Security Systems |
 Glossary
of Access Control Terminology
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Alarm
input- A device that is monitored by the access control
panel. An alarm signal will be generated if the device is
activated.
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Anti-Passback-
A feature that will not allow any card to re-enter unless it
has been used to exit. This requires that readers be used
for both entry and exit.
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Central
or on line processing- A system where all systems
information is stored in a central location and all go or
no-go decisions are made by this unit.
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Distributed
processing- An access control system where some of the
system information is stored at the individual readers or
controllers. This allows the system to operate when the host
is down or not communicating.
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Door
forced open- A signal indicating that the door was opened
without a valid card or request to exit device. This
requires a status switch and some type of rex device.
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Door
held open- A signal that indicates that the door was held
open longer than it should have been. This is used to
prevent someone from using a card to enter and then leave
the door open for others. This requires a status switch on
the door.
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Easy
egress- A means of exiting where the person wishing to leave
simply turns the doorknob to exit.
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REX
button- A Request to exit button. A device that must be
pushed in order to release the door.
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Fail
safe- Is a locking device that is unlocked when no power is
applied.
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Fail
secure- Is a locking device that is locked when no power is
applied. These are not normally used for exit doors since
they cannot be unlocked during a power outage.
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Glass
break station- A device mounted near the exit door that can
be used to release the door in the event of an emergency.
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MOV-
Metal oxide varistor, a device used to prevent the emf
generated by the locks from damaging the control.
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MODEM-
A MODulator dEMulator. An electronic device that allows
communication between electronic devices.
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PIN- A
Personal Identification Number assigned to a user. It is
used either by itself or in conjunction with a card.
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Remote
Host- A system where the main computer that controls the
system is remotely located. It allows a single computer to
control multiple systems.
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Stand
alone- A system where the entire system is contained in the
card reader.
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Shunt
time- When a door is released the status switch is
automatically "shunted" for a period of time to
allow the person to enter/exit. If the time is exceeded a
door held open signal will occur.
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Status
switch- A magnetic contact mounted on the controlled door.
It is used to detect door held or door forced.
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Time
zones- "Schedules" that allow cards to function or
not function depending on the time of day. This is used to
limit access to the facility. The schedule may include not
only time but which days of the week a card is valid.
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