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SCSI standard

SCSI standard

1. SCSI-11983 started research, 1985 developed the SCSI standard is characterized by: support for synchronous and asynchronous SCSI devices; support for seven 8-bit SCSI devices; transmission rate of up to 5M / s; support WORM (WRITE ONCE READ MANY )equipment. SCSI-1 control using the card ISA bus, its maximum connection length of 6 meters, the connector is 50-pin, but because the transmission speed is too slow, now has not used. 2. The SCSI-2 SCSI-2 standard was developed in 1992. It supports the following new features in the SCSI-1 standard; supports high-density SCSI connectors; supports CD-ROMs and scanners; SCSI bus with even parity; supports FAST SCSI and WIDE SCSI; support Tagged Queuing function. FAST SCSI is the standard specification for SCSI-2. WIDE SCSI is the enhanced specification that comes with SCSI-2. FAST SCSI allows data rates on the SCSI bus to reach 10M / s, twice the speed of SCSI-1 devices. Most SCSI hard drives support the FAST SCSI standard. FAST SCSI devices require data synchronization. When installing a FAST SCSI device, its maximum cable length can not exceed 3 meters and the connector is 50-pin, up to 7 devices. The WIDE SCSI bus compares with the FAST SCSI bus and transmits 16-bit data at the same time, which increases the data transfer rate of devices supporting WIDE SCSI to 20M / s. And the WIDE SCSI bus can support both 8-bit and 16-bit SCSI devices, when you use the WIDE SCSI control card, it should be noted that it can only connect up to 15 SCSI devices, the connector is 68 or 80 pin, the maximum cable length can not exceed 6 meters. 3. SCSI-3 and SCSI-2 compared to SCSI-3 can support more computer hardware types, and data transfer rate is also faster. SCSI-3 supports Ultra SCSI, SCSI-3, also known as FAST-20, Doublespeed SCSI, which defines how to transmit 20M data per second on an 8-bit SCSI bus and 40M per second on a 16-bit wide SCSI bus. This control card with 50-pin connector, 8-bit data transmission, can be connected in series 7 SCSI devices, the maximum cable length of 1.5 meters. When the 68-pin or 80-pin connector, 16-bit data transmission, can be connected in series 15 SCSI devices, the maximum cable length of 1.5 meters; support Fiber Channel, providing up to 100M / S transfer rate; support serial channel, Serial 16-32 and SCSI


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