Raritan Computer DKX2-V2.3.5-0N-E - Manual (Page 138)

Chapter 7: User Management
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9. The default number of retries is 3 Retries.
This is the number of times the KX II will send an authentication
request to the RADIUS server.
10. Choose the Global Authentication Type from among the options in
the drop-down list:
 PAP - With PAP, passwords are sent as plain text. PAP is not
interactive. The user name and password are sent as one data
package once a connection is established, rather than the server
sending a login prompt and waiting for a response.
 CHAP - With CHAP, authentication can be requested by the
server at any time. CHAP provides more security than PAP.