Polycom RMX 1500 Administrator's Manual page 747

• The RMX only switches between MPM, MPM+ and MPMx Card
Configuration Modes if MPM / MPM+ / MPMx cards are removed or
swapped while it is running.
•
The Card Configuration Mode switch occurs during the next restart.
•
Installing or swapping MPM / MPM+ / MPMx cards while the system is off
will not cause a mode switch when the system is restarted – it will restart in
the Card Configuration Mode that was active previous to powering down.
•
From Version 7.1, MPM media cards are not supported.
Polycom RMX 1500/2000/4000 Administrator's Guide
19-83