The 32-way switch is implemented as three stage Clos network which consists of 8 terminal stage switches and four centre stage switches. The connections between the switches can be seen in figure 5. The module uses the same control structure as the 4x8-way switch module, i.e. a T8 microcontroller and DS-Links or RS232 to initialise and control the switch. The board will also be built in 19`¨ mechanics and the printed circuit board layout is currently in its final stages.