Linkskey LKV-IPM01 - Manual (Page 84)

KLE User Guide R1.2
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Password Authentication Protocol : Here you should select the password
authentication protocol to be either CHAP or PAP.
RADIUS secret : Here you should specify the RADIUS secret, or Shared Secret,
between the RADIUS client (i.e. KLE) and the RADIUS server. Note that the RADIUS
secret, or the Shared Secret, is a shared text string that is used as a password
between the RADIUS client and RADIUS server.