Ultra Start 450 SERIES Manuel d'instructions Page 97

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Chapter 4 Hardware Configuration 77
Use the following cabling guidelines to ensure proper device termination:
The SCSI bus must be correctly terminated. Most Sun devices use
autotermination. See the documentation supplied with the device.
If all external mass storage devices use 68-pin connectors, connect all non-Sun
devices to the system first and Sun devices last in the chain, since Sun 68-pin
devices use autotermination.
If external mass storage devices consist of 68-pin devices and 50-pin devices,
connect the Sun 68-pin devices to the system first and terminate the chain with a
50-pin device and its terminator. The 68-pin device connected to the 68-50 pin
adapter cable must be auto-terminating in order to terminate the high-order bits.
Caution Do not connect 68-pin devices after 50-pin devices; SCSI bus errors
will occur.
The following figures provide a summary of the cabling guidelines.
Multi-initiator Support
The SCSI implementation of the system includes multi-initiator support: any
external host adapter on the bus can drive Termpower. This means that if the system
should lose, the devices on the SCSI bus (except those powered by the system) can
continue to operate.
Non-Sun Device Non-Sun Device Sun Device
Sun Device Non-Sun Device 50-pin Device
68 - 68 68 - 68 68 - 68
68 - 68
68 - 68 68 - 50
T
Adapter Cable
Terminator
System
System
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