A picture of the new BEB for fast readout. To achieve fast readout of ADC data, we adapt data transfer system via Ethernet LAN using 100 Mbps SiTCP (Uchida 2008). In this system, a transmission control protocol (TCP) and an Internet protocol (IP) are employed for data transfer from the BEB to the DAQ PC and a user datagram protocol (UDP) is used for slow control from DAQ PC to the BEB. One BEB can read four FEBs. This BEB may achieve ten times the readout speed of the current BEB.