The types of interfaces that different SAN switches may support are not exactly the same, and the performance of various interface types is different. Be sure to look at it when purchasing. For example, SCSI interface, we know that the latest Ultra 320 can reach 320MB/s, the transmission distance is only 20 meters, which is usually a dedicated interface for disk device connection; Fibre Channel (FC) can currently provide 1~4GB/s transmission rate (maximum Up to 10GB/s), at least 3 times faster than SCSI, usually used for server host and SAN switch connections, and some disks support FC interface; Escon interface designed by IBM, it can support in full-duplex mode on fiber A data rate of 200 MB/s, which is typically the interface between a server host or a SAN switch. According to different configurations, the Escon interface can support a transmission distance of 3 to 10 kilometers, depending on the quality and product characteristics of the fiber. The FICON interface, also developed by IBM, is the latest interface type and the connection interface between servers or SAN switches. It has a transfer speed six times that of ESCON. The transmission distance is also over 19 kilometers. However, many SAN switches provide support for these interfaces.