IBM 150 Manuel D’Utilisation

Storage Architectures and Devices 

Devices that have two SCSI connectors have internal cabling that must be 
included when calculating the total cable length. When attaching these 
devices to a SCSI chain, connect one cable to one connector and the other 
cable to the other connector. Do not piggy back the second cable/terminator 
onto the first as you would with a device that had only one SCSI connector as 
shown in Figure 31.

A dedicated adapter should be used for attachment of any external enclosure 
containing multiple SCSI devices.

4.3.1.3  SCSI Terminators
There must be exactly two terminators on the SCSI bus, and they must be 
located at each end of the bus.

  • For SCSI adapters with external devices only, make sure the appropriate 

SCSI terminator is connected to the last device on the bus.

  • For SCSI adapters with internal devices only, make sure that the 

appropriate SCSI terminator is connected to the end of the internal SCSI 
cable.

  • For SCSI adapter with both internal and external devices, make sure the 

appropriate SCSI terminator is connected to the last device on the 
external bus and that the end of the internal SCSI cable has been properly 
terminated.

one connector device