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B
Direct Connection
Daisy Chain Connection
SCSI Bus Length
B-2
Use a direct connection when you are connecting the first SCSI device in the
SCSI bus to the desktop computer system by connecting one end of the SCSI
cable to one of the SCSI ports of the DDP, and the other end of the SCSI cable
to the SCSI port of the desktop system. You must connect a regulated SCSI
terminator to the other SCSI port of the DDP.
Note – If you install a SBus card with an additional SCSI port in the desktop
system, you can connect the DDP to the SCSI port of the SCSI card.
A daisy chain connection is a means of connecting a number of SCSI peripherals
to a host system. It allows a single port on the desktop system to connect to more
than one SCSI peripheral. If you want more than one SCSI peripheral on a bus, you
need to daisy chain.
Note – Devices with the old-style connectors (3-row 50-pin D connectors or
50-pin ribbon connectors) should not be used on the same bus (daisy-chained)
with fast SCSI devices.
If you connect SCSI devices to your system in this manner, connect a regulated
terminator to the unused SCSI port on the back panel of the last device in the
daisy-chain.
A bus is a signal route to which several parts of a computer system may be
connected so that signals can pass between them. The total length of a SCSI bus
includes:
•
The length of the external SCSI cable plus
•
The length of the internal SCSI buses for the device and the system
Your desktop system performance is reliable with a maximum SCSI bus length
of 20 feet (6 meters), as illustrated below. The internal signal path of your
system unit and the external SCSI cables must not exceed this maximum
length. If this length is exceeded, the system will not run in a reliable manner.
2 Gbyte Standard Connector Disk Drive Installation Manual—May 1995
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