The Copper Passthru Module (CuPM) is an unswitched/unblocked bidirectional copper connection to each blade server. This option provides Ethernet network connectivity for customers who have available ports on external Ethernet switches by delivering an alternative method to connect to Gigabit Ethernet network architectures.This module is used to transfer data between the BladeCenter units and the external Gigabit Ethernet networking environments, allows up to 14 blade connections per module.