http://docs.google.com/Doc?docid=0AZTOJNVUoixhZGZ4cjRiemtfMzQyaGZtOG4yZ2o&hl=en ------------------------------------------------------------------------------------------------------------------ Guy Roberts, Ph.D Network Engineering & Planning DANTE - www.dante.net<http://www.dante.net/> Tel: +44 (0)1223 371 316 City House, 126-130 Hills Road Cambridge, CB2 1PQ, UK ------------------------------------------------------------------------------------------------------------------