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100 MDS Orbit MCR/ECR Technical Manual MDS 05-6632A01, Rev. F
Figure 3-44. ISM 900 (NX) PSK Security Settings

Security Mode - The type of authentication to perform
- none - Provide no device authentication or data privacy (DEFAULT)
- psk - Use pre-shared key authentication protocol
- eap - Use Encapsulated Authentication Protocol - will change the fields displayed and
give the user the ability to enter radius info on the AP and certificate info on the remote.

Encryption - The type of encryption to perform
- none - No data privacy (DEFAULT)
- aes128-ccm - Protect data with 128-bit AES encryption using CCM mode
- aes256-ccm - Protect data with 256-bit AES encryption using CCM mode

Passphrase - The passphrase used in PSK mode, 8 to 64 letters. (DEFAULT=blank)

Radius Server
– A reference to the RADIUS server configuration configured through the
System – RADIUS side menu item (section 3.7.4).

Rekey Interval – The session key for an active secure link changes at a regular basis. You
may increase the length of the rekey interval in order to reduce overhead caused by the
rekeying communications between radios on a narrowband channel. Valid values:
-
0 – Rekeying will not be time-based, but will instead occur every one million
packets.
-
30-525600 minutes, DEFAULT 180