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Table Of Contents  CertiGuide to Network+
 9  Chapter 1001: Networking in the Real World
      9  V  Network Hardware Connectors and Components

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SCSI

The SCSI (Small Computer System Interface) pronounced ‘scuzzy’. The important issue to remember about SCSI is that like the serial port, it has gone through several changes in its long life.

Each device needs a specific ID number. The older standard follows the numbering scheme 0-7, while the newer standard is 0-15.

SCSI ID – 0 = Boot, 7 = Controller

A bootable hard drive should have the device number set to 0 (zero), and the SCSI controller should be set to 7 (seven).


As previously mentioned, SCSI has lived a long life. This translates to devices of different performance levels. Mixing devices of different capabilities results in the lowest performance level of all devices on the chain being used. When dealing with SCSI devices, you will probably see one or more of the following connectors. (On servers, you might also see an 80-pin SCSI connector called an SCA connector).

Figure 62: DB Connectors

 


SCSI Connectors

The popular connectors are 25, 50, 68 pins.

Notice that SCSI connectors can look much like the serial DB-25 connector.



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