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| Subject: | [CISSP-D] Confused: fail-safe and fail-secure lock |
|---|---|
| Date: | Sat, 6 Nov 2004 23:04:23 -0800 (PST) |
I am confused by the following definition about fail-safe and fail-secure lock:
CISSP All-in-One 2002 Page 330
A fail-safe configuration means that a door would default to being locked if
there were any problem with the power.
A fail-soft setting means that if there were a power disruption,..., the doors
would default to being unlocked.
The ASIS website provides the following definition:
fail safe lock - a type of lock that automatically opens when a power failure
occurs.
fail secure lock - a type of lock that automatically locks when a power failure
occurs, as opposed to a fail safe lock.
fail soft - the capability of a physical protection system to operate, perhaps
in a reduced capacity, during a failure of some element in the system.
Can someone please advise me which definition should I follow?
Thanks.
--Weifeng
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