Chapter 11 11-9
SCSI Peripherals and I/O Information
Differential
TERMPWR = 4.25 to5.25 vdc. with 600 ma source drive capability for the 50-pin cable, and 1000 ma
source drive capability for the 68-pin cable.
Normal Operation
1. Do not connect or disconnect a device on an active SCSI bus or to any bus that has devices
supplying termination power. Shut down the system and turn off all external SCSI devices before
connection or disconnecting products.
2. Do not power on or off a device on an ACTIVE SCSI bus.
CAUTION
Do not power on or off a device on an ACTIVE SCSI bus for the following reasons:
1. Noise can be injected which may cause devices on the bus to be reset or cause the
system to reset the bus do to detection of an error. A reset interrupts the normal
operation of the bus and can affect system performance.
2. The action can cause data corruption.
3. Some devices do not meet specified standards when doing power on (C1512A and
7980S)
Common Problems
Common Problems in the Field:
• Maximum cable length exceeded.
• Improper Termination
• More than 1 device at the same address
• Damaged connector pins on High-Density cables.
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