Polycom RMX 4000 Hardware Guide
•The RMX switches between MPMx and MPM+ Card Configuration Modes when MPM+/MPMx cards are removed or swapped while the system is running.
•The switch between Card Configuration Modes occurs during the next restart.
•Installing or swapping MPM+/MPMx cards while the system is off will not cause a switch in the Card Configuration Mode when the system is restarted
– it will restart in the Card Configuration Mode that was active previous to powering down.