The Multiplexer Expansion Modules that are installed on the chassis. The Multiplexer Expansion Modules are listed as a bitmap. The bitmap is a string containing a list of 1's and 0's that is as long as the number of Multiplexer Expansion Modules supported. If a Multiplexer Expansion Module is installed in a bay, a 1 is present in the string in the position representing the bay ID as read from left to right. For example, if Multiplexer Expansion Module is installed in bays 1, and 2 Multiplexer Expansion Modules are supported, the string would look like '10'.