In this paper, an optical fibre data network on board of military a/c is considered. Over this network informations are to be communicated between computers, sensors, displays and other avionics systems in form of packetized message. Empty slots strategy protocol is considered over a loop configurated network. Some aspects of this network are analyzed so as to cl arify its traffic characteristics and design issues. A complete experimental set-up is under development. A 3-station loop con-figuration is assumed and interface units for each station is implemented using the commerically available MSI digital circuits. CRT photos showing packetized signals, framing and synchronization signals are included. Imple-mentation using microprocessors will be straight-forward from the implemented scheme.