The switch modules that are communicating on the chassis. The switch 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 switch modules supported. If a switch module is installed and functioning 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 switch modules are installed and functioning in bays 1 and 3, and 4 switch modules are supported, the string would look like for BladeCenter and BladeCenter T and '1011000000' for BladeCenter H and BladeCenter HT.