Polycom DOC2230A - Manual (Page 137)

Chapter 8 - Management Tools
8-7
The following modes are available:
— Circular - The system allocates the next available sequential unit in
the order in which it is numbered on the card according to the unit
numbers. For example, if the last used unit is 2, the next time a
conference is run, the system will allocate units starting with unit 3
(provided that unit 3 is free). This mode should be used when you
suspect that there may be faulty units, allowing the system to
allocate other units for the conferences while the faulty units are
replaced, or reset. However, this mode should not be used when
debugging the system, as the problems will be inconsistent if the
problematic units are not used constantly.
— Terminal - The system always starts the unit allocation from the first
free unit on the first card. This mode may be problematic when there
is one faulty unit (especially if it is the first or second) that prevents
the system from running conferences. However, this should be the
selected mode when debugging the system.