PICMG CPCI-S.0 R1.0

CPCI Serial Space is based on CompactPCI® Serial. However, some unnecessary features were removed. For example, CPCI Serial Space does not need to route USB or SATA signals over the backplane so these signal lines can now be used for additional rear I/O connections. On the other hand, due to the requirements of some space applications, CPCI Serial Space requires in comparison to CompactPCI Serial new signal lines.
CPCI Serial Space does not route USB or SATA links on the backplane. These signals can be used for rear I/O connections.
CompactPCI Serial defines dedicated PCI Express and Ethernet links on the backplane. CPCI Serial Space maintains the routing of these signal lines but defines these backplane links as physical connections not dedicated especially to Ethernet or PCI Express. This has the advantage that they can be used for Ethernet and PCI Express links but also for other transport protocols like SpaceWire, TTEthernet and EtherSpace for inter-board communication.