The CDD device is a clock generation and distribution device intended for use in FDDI (Fiber Distributed Data Interface) networks The device provides the complete set of clocks required to convert byte wide data to serial format for fiber medium transmission and to move byte wide data between the PLAYERTM and BMACTM devices in various station configurations 12 5 MHz and 125 MHz differential ECL clocks are generated for the conversion of data to serial format and 12 5 MHz and 25 MHz TTL clocks are generated for the byte wide data transfers