http://www.epn-online.com/page/new59551/pcie-switch-devices.html and http://www.plxtech.com/products/expresslane/switches
This seems to come up with every new generation of a new bus, such as pci or lately pcie. It has a lot of limits and, eventually, people just go with a fast network. For one thing, it doesn't grow that big and, for another, error handling can be interesting. ron
