The SRX5K-MPC (see Figure 1) is an interface card with two slots that accept MICs. These MICs add Ethernet ports to your services gateway. An MPC with MICs installed functions in the same way as a regular IOC but allows you to add different types of Ethernet ports to your services gateway. MPCs and MICs are similar in form and function to Flex IOCs and port modules. However, the two use different form-factors, so you cannot install port modules in an MPC, nor can you install MICs in a Flex IOC.