Communication over a computer network with a node having a first port with a point-to-point link connection to a second node having a second port. The first port transmits to the second port a reliable link layer (RLL) packet over the link. The RLL packet comprises a first RLL header and a first data...http://www.google.com/patents/US7876751?utm_source=gb-gplus-sharePatent US7876751 - Reliable link layer packet retry
