The physical devices used to attach a SCSI cable to a SCSI device are called Connectors. Several different types of SCSI connectors are used in the construction of SCSI cables.
D-Shell (D-Sub, DB):
A 50-pin D-shell connector whose name is derived from the "D-shaped" metal shell that is found around the pins on the male half of the connector. D-shell connectors that are used for parallel and serial connections on PCs.
Centronics
Another external connector type that was defined by the SCSI-1 standard is the 50-pin connector commonly called Centronics connector. In Centronics connectors, two rows of flat contacts are used instead of thin pins. There are two latches provided on either side, which is used to hold the connector in place.
