The SpaceWire standard specifies a means of using a router to copy and distribute a SpaceWire packet to several nodes attached to different ports of the router. This was included for the specific purpose of distributing the same data to several processors in a parallel processing system. It can cause significant problems when used in a SpaceWire network and its use is not recommended. For example, if a packet is arriving at one port of the router and being distributed out of several other ports and a node attached to one of these ports cannot accept any more data, for whatever reason, the data going to all of the processors will halt. Any fault is effectively multiplied.