Newsletter
The Black Box website uses cookies.
By continuing the use of the Black Box website, or by pressing the agree button on the right, you consent to the use of cookies on this website. Más Información.
Inicio > Recursos > Recursos Técnicos > Black Box Explica > SCSI > SCSI-1, 2, 3 and 5 Connectors
Navegación
 
SCSI-1, 2, 3 and 5 Connectors

SCSI 1, 2, 3 and 5 connectors


SCSI 1 connectorThe original SCSI standard was approved in 1986. It supports transfer rates of up to 5 Megabytes per second (MBps) and 7 SCSI devices on an 8-bit bus. The most common connector for SCSI-1 is the Centronics® 50 or Telco 50. A Micro Ribbon 60 connector may also be used.


SCSI 2 connectorApproved in 1994, SCSI-2 introduced optional 16- and 32-bit buses called “Wide SCSI.” The transfer rate, normally 10 MBps, can go up to 40 MBps when combined with Fast and Wide SCSI. SCSI-2 usually uses a MicroD 50-pin connector with thumbclips. It’s also known as Mini 50 or Micro DB50. A Micro Ribbon 60 connector may also be used.


SCSI 3 connectorFound in many high-end systems, SCSI-3 commonly uses a MicroD 68-pin connector with thumbscrews. It’s also known as Mini 68.
The most common bus width for SCSI-3 is 16-bit with transfer rates at 20 MBps. Serial-bus and fibre-channel protocols are in development.
NOTE: If you’re going from SCSI-3 to SCSI-2, check your equipment to see if it terminates the 16 unused leads. If not, you’ll need a High-Line Terminator.


SCSI 5 connectorSCSI-5, a newer type of connector interface, is also called VHDCI (Very High-Density Connector Interface) or a 0.8-mm connector. It’s similar to the SCSI-3 MD68 connector in that it has 68 pins and a much smaller footprint.


SCSI-5 is designed for next-generation SCSI connections where high performance is a key requirement. Manufacturers, such as IBM® and Hewlett-Packard®, are integrating this new 0.8-mm connector design in their controller cards. It’s the connector of choice for advanced SCSI multiport applications, such as Ultra SCSI Fast-20 and the new Low-Voltage Differential Signal (LVDS) technology.
Because of SCSI-5’s special offset cable exit, up to four channels can be accommodated in one card slot. Connections are also easier where space is limited.



Learn more: SCSI Termination

 
Share |