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The Water Cherenkov Detector Array (WCDA) is one of the major components ofthe Large High Altitude Air Shower Observatory (LHAASO). In the WCDA, 3600Photomultiplier Tubes (PMTs) and the Front End Electronics (FEEs) are scatteredover a 90000 m2 area, while high precision time measurements (0.5 ns RMS) arerequired in the readout electronics. To meet this requirement, the clock has tobe distributed to the FEEs with high precision. Due to the "triggerless"architecture, high speed data transfer is required based on the TCP/IPprotocol. To simplify the readout electronics architecture and be consistentwith the whole LHAASO readout electronics, the White Rabbit (WR) switches areused to transfer clock, data, and commands via a single fiber of about 400meters. In this paper, a prototype of data and clock transmission interface forLHAASO WCDA is developed. The performance tests are conducted and the resultsindicate that the clock synchronization precision of the data and clocktransmission is better than 50 ps. The data transmission throughput can reach400 Mbps for one FEE board and 180 Mbps for 4 FEE boards sharing one up linkport in WR switch, which is better than the requirement of the LHAASO WCDA.

Data and clock transmission interface for the WCDA in LHAASO