
SCSI and I/O 8-3
SCSI Cables
The information in this section is common to all types of SCSI busses.
1.
The cable length used to connect the SCSI devices plus ANY cable length internal to the device must
not exceed the appropriate limits as previously stated.
2.
Minimize the SCSI bus length but do not use cables shorter than 0.5m external.
3.
Because cable impedance and construction affect bus signal quality, only HP cables are
recommended.
4.
While the high-density SCSI connectors on the HP-PB Host Adapters support both thumbscrew and
squeeze latch cables, only the thumbscrew type are recommended because of reliability and RFI
concerns with the squeeze-latch cables.
Cable Characteristics
Single-Ended and Differential, 50 and 68 conductor flat cables or 25 and 34 single twisted pair cables with
a characteristic impedance of 90 to 140 ohms must be used for our application. (All Hewlett Packard
supplied cables meet this requirement.)
Voltages / Current
Single-Ended
Output Characteristics - Either open collector or tristate drivers.
Signal True (low) = 0.0 to 0.5 Vdc.
Signal False (high) = 2.25 to 5.25 Vdc.
Input Characteristics - Device powered on including drivers and passive receivers.
Signal True (low) = 0.0 to 0.8 Vdc.
Current = -0.4 to 0.0 mA @ 0.5 Vdc.
Signal False (high) = 2.0 to 5.25 Vdc.
Current = 0.0 to 0.1 mA @ 2.7 Vdc.
Differential
Output Characteristics:
V ol (Low-Level output voltage) = 1.7V max. at I ol (Low-Level output current) = 55 mA.
V oh (High-Level output voltage) = 2.7V min. at I hl (High-Level output current) = -55 mA.
V od (Differential output voltage) = 1.0V min. with common mode voltage ranges from -7 to +12 Vdc.
Input Characteristics:
I i (Input Current on either input) = +/- 2.0 mA. with input voltages between -7 and +12 Vdc. with
power on or off an with hysteresis = 35 mV min.
Summary of Contents for 3000/9x9KS Series
Page 14: ...xiv Contents E Sources of Information on the Web ...
Page 28: ...2 8 Install and Configuration Figure 2 4 HP PB I O Slot Location Diagram Kx70 Kx80 ...
Page 44: ...2 24 Install and Configuration ...
Page 68: ...3 24 Troubleshooting HP 3000 Core I O Figure 3 4 HP 3000 Core I O ...
Page 120: ...5 6 Diagnostics ...
Page 128: ...6 8 Replaceable Parts Figure 6 4 Peripheral Bay Expanded View ...
Page 136: ...6 16 Replaceable Parts ...
Page 150: ...7 14 Removal and Replacement Figure 7 11 Peripheral Bay Rear View ...
Page 180: ...7 44 Removal and Replacement Figure 7 35 Cabinet Exploded View Rear ...
Page 209: ...SCSI and I O 8 21 Figure 8 3 A3629A ST19171WD J2 and J6 Jumper Settings ...
Page 217: ...SCSI and I O 8 29 Figure 8 7 A3353A source 2 J3 Jumper Positions ...
Page 218: ...8 30 SCSI and I O Figure 8 8 A3353A source 2 Option Connector Jumper Positions ...
Page 280: ...8 92 SCSI and I O Diagnostics CSTM SCSIDDS SYSMAP IOMAP ...
Page 298: ...8 110 SCSI and I O Diagnostics SCSICD IOMAP SYSMAP ...
Page 302: ...8 114 SCSI and I O ...
Page 308: ...Support Information B 2 HP 9x9KS Block Diagram Figure B 1 HP 3000 9x9KS Block Diagram ...
Page 309: ...B 3 Support Information HP K100 Block Diagram Figure B 2 HP 9000 K100 Block Diagram ...
Page 310: ...Support Information B 4 HP K2x0 K4x0 Block Diagram Figure B 3 HP 9000 K2x0 K4x0 Block Diagram ...
Page 311: ...B 5 Support Information Kx70 Kx80 Block Diagram Figure B 4 HP9000 Kx70 Block Diagram ...
Page 342: ...Memory Configuration Guidelines C 16 ...
Page 350: ...D 8 New System Features ...