User`s manual

2. Basic concepts

2.1 Basic concepts

This section contains definitions and descriptions of David-Link Biometric/Fingerprint Door Access

Control concepts including:

 User Enrollment

 User Verification

 Match Threshold Levels

 User ID Numbers

 Authority (Status) Levels

2.1.1 User Enrollment

During user verification, live fingerprint scan is compared with stored to confirm user’s identity.

The enrollment process takes approximately 1 second. All ten fingers can be enrolled for the

same ID number or the same user.

Ideally, one finger from each hand should be enrolled so that if one finger is injured, the

alternate finger template can still be verified. It is recommended to enroll the left and right

index fingers for enrollment.

2.1.2 User Verification

Verification process starts when a user enters an ID number, places a finger on the

fingerprint sensor, or inputs a password combination for comparison with the stored

template.

2.1.3 Match Threshold Levels

Match Threshold Levels establishes a balance between False Acceptance Rate (FAR) and False

Rejection Rate (FRR). FAR is the frequency of a non-authorized user is falsely recognized and

granted access to the system. FRR the frequency of an enrolled and authorized user, who should

be granted access to the system, is denied on the basis that the system did not recognize. FAR

and FRR affect each other. Lower FAR yields to higher FRR.

You can set match threshold levels on a per-use basis. The higher the threshold is set, the higher

the security is ensured; however, it is recommended to leave this setting as default, threshold

value = 3, since the default threshold is commonly accepted as the balance of FAR and FRR rate.