Test modules e.g. EDM-2003B and CM-1G-D12 that have 2 or more ports per port groups. When assigning ports belonging to the same port group, the ports can only be assigned to the client or the server, and not both. Once a port is assigned to a client, all ports within the port group can only be configured as client ports. Unused ports will be grayed out and cannot be assigned to the server. A port from a different port group is required if a server port is needed.