Fibre Distributed Data Interface. A fast token-ring type network, designed for use in backbones, back when 100 MB/s was fast enough for that. - http://www.iol.unh.edu/training/fddi/htmls/ - http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/fddi.htm - http://www.nswc.navy.mil/ITT/x3t12/ - http://www.rad.com/networks/1995/fddi/fddi.htm The important thing is that the upper interface looks like this: - void send( u8 srcport, u8 dstport, u8 control, byte[] payload ) - (u8,u8,u8,u8[]) recv() - _other stuff?_ The use of the control byte is unclear. The port numbers (known as Service Access Point numbers in FDDI) identify which host process is sending the packet, and which should receive it; presumably there will be a single process for each network-layer protocol. The payload may be up to 4473 bytes long. CategoryNetwork