KVN station has two recording systems, Mark5b and Mark6.
Mark5b and Mark6 are hard disk recording systems developed at Haystack observatory. The maximum data rate of Mark5b and Mark6 systems are 1Gbps and 16Gbps, respectively. For more details, please see http://www.haystack.mit.edu/tech/vlbi/mark5 and http://www.haystack.mit.edu/tech/vlbi/mark6. At KVN stations, Mark5b records the output data stream of a digital filter. Refer to receiver block diagram section for data stream connection and digital filter mode section for available bandwidth and number of channels of 1Gbps data stream. Mark6 records output data streams of four samplers via Fila10G. Fila10G converts four VSI streams from four samplers into VDIF(VLBI Data Interchange Format) data and sends them to Mark6 on 10GbE network connection. There is no digital filtering fuction in Fila10G. Therefore, single IF of Mark6 data of KVN has always 512MHz bandwidth. 2Gbps(1IF x 512MHz), 4Gbps(2IF x 512MHz) and 8Gbps(4IF x 512MHz) modes are available in KVN using Mark6.