A routing method, performed by intelligent network elements of a data communications network having SONET applications, for selecting a path from a source network element to a next network element. Each network element has access to a database containing the addresses of its neighboring network elements...http://www.google.com.hk/patents/US5262906?utm_source=gb-gplus-share專利 US5262906 - Message routing for SONET telecommunications maintenance network
