THE QLOGIC ETHERNET AND 4GB FC CFFH I/O EXPANSION CARD IS USED IN CONJUNCTION WITH THE MULTI-SWITCH INTERCONNECT MODULE, AND REQUIRES THAT AN ETHERNET CAPABLE I/O MODULE BE INSTALLED IN THE LEFT POSITION OF THE MUTLI-SWITCH INTERCONNECT MODULE, AND A FIBER CHANNEL CAPABLE I/O MODULE INSTALLED IN THE RIGHT POSITION OF THE MULTI-SWITCH INTERCONNECT MODULE. BOTH SWITCHES DO NOT NEED TO BE RESIDENT AT THE SAME TIME SINCE THE FIBER CHANNEL AND ETHERNET NETWORKS ARE SEPARATE AND DISTINCT.