Specifications

FPT-40 Installation & Operation Guide Page 2-5
Caution! Use care when enrolling users at the terminal as the ESC
button can alter the entry fuctions during some
operations.
Introduction
User Identification/Verification
This is the process of comparing a user's finger against the stored map,
and/or verifying a user from a stored password number (5 digit max).
After performing the verification process the system will indicate success
or failure while also storing all verified punches for transfer to the Time &
Attendnace software.
Threshold
The threshold is a predefined number, often controlled by the
administrator, which establishes the degree of correlation necessary for
a sucessful match. If the score from the template comparison exceeds
the threshold, the templates are considered a match. The threshold
establishes a balance between False Acceptance Rate (FAR) and False
Rejection Rate (FRR). FAR indicates the probability that a biometric
system will incorrectly identify an individual or will fail to reject an
imposter.
You can set the threshold for all users. For a user who has a difficult
fingerprint verification, it is recommended to use ID & fingerprint
verification (match one-to-one). Raising the threshold increases security,
while lowering it increases the passing ratio. The correct balance can be
vital. For example, a user whose finger is worn or injured should have a
reduced threshold.
The FAR and FRR values affect each other. As FAR is increased, FRR
should be decreased. The default one-to-many threshold is 35, while the
1:1 matching default threshold is 15 (see the following table).
Table 2-1 Recommended Threshold Level Settings
FRR FAR One-to-Many One-to-One
High Low 45 25
Middle Middle 35 15
Low High 25 10