Configuring HP-UX For Peripherals

92 Chapter3
Configuring Interface Cards
Selecting Device Drivers for Your Interface Cards
Cabling options can be ordered for the HP fast/wide/differential host
adapter (HP 28696A) to extend standard cabling and for SwitchOver
configurations (V-cables, male-male-male to daisy-chain multiple hosts).
Table 3-13, “Fast/Wide SCSI Cables,” shows additional cables available
to connect a Fast/Wide SCSI adapter-to-peripheral or
peripheral-to-peripheral.
The HP 28643A SCSI Fiber-Optic Extender overcomes SCSI distance
limitation to a maximum of 100 meters. Note, however, this device is
single-ended SCSI and is recommended for printers, optical libraries,
and magnetic tape drives only. It is not supported for SwitchOver
configurations.
SCSI cable impedance and construction have a significant impact on
signal quality; use only HP cables.
Calculating SCSI Cable Length
Table 3-14, “Example of SCSI Cable Length Calculation,” demonstrates
how to calculate SCSI bus cable lengths for a typical installation.
Table 3-13 Fast/Wide SCSI Cables
Product
Number Length Product Compatibility
C2911A 0.9 m C2425JK, C2427JK, C3034T, C3035T, C3036T
C2924A 2.5 m C3034T, C3035T, C3036T
C2925A 10.0 m C3034T, C3035T, C3036T
C2926A 20.0 m C3034T, C3035T, C3036T
Table 3-14 Example of SCSI Cable Length Calculation
Starting Point
Device Cable to Next Device
Internal
Cable
Cumulative
Cable Length
SCSI host adapter 5062-3383 1.0m 0.1m 1.1m
HP device #1 92222A 0.5m 0.2m 1.8m
HP device #2 92222A 0.5m 0.4m 2.7m
HP device #3 92222A 0.5m 0.3m 3.5m