Digital baseband signal, SFPCI-6533 4-channel 8-channel 100M digital acquisition and processing card. PC operating system can use the currently popular Windows series, Unix and other operating systems. Can achieve 4 the channel TTL/HDB3 communication baseband signal acquisition, the acquisition and synchronization extraction procedure can be dynamically loaded provide E1/E2/E3, sync of T1/T2/T3 real-time signal acquisition and byte code rate adjustment feature provides E1 / T1 signal solution HDLC synchronous acquisition function, IBS signal synchronous descrambler acquisition, can also be collected directly original Communication baseband signal; interface provides users loader. Continuous acquisition passed in two ways: the first one is the continuous acquisition into the system buffer; the end of each DMA (16384 byte blocks) to notify the user program the second continuous acquisition to the user buffer; each FIFO half-full, notify the user start a DMA can provide users with FPGA acquisition and processing program design services.