The device automatically backs up the configuration data on a KEY-PLUG (as delivered) upon start-up. Changes to the configuration during operation are also saved on the KEY-PLUG without any additional operator intervention being necessary.

During start-up, an unconfigured device automatically loads the configuration data from an inserted KEY-PLUG that has been written to provided the data was written by a compatible device type.

Diagnostics

Incorrect use of the KEY-PLUG such as inserting a KEY-PLUG containing the configuration of a non-compatible device or general malfunctions of the KEY-PLUG are indicated by diagnostics mechanisms of the terminal device (LEDs, SNMP, Web based Management, etc.).