HP Vectra VL800, Техническое справочное руководство

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89
4 Interface Cards
SCSI Adapter Cards
Internal Connection
The internal connector is a Wide SCSI 68-pin high-density connector. The
internal ribbon cable has to be connected to this connector.
External Connection
The external connector is located on the PCI bracket. It is a shielded Wide
SCSI 68-pin high-density connector. Any cable connected to this connector
must be shielded.
• When running in LVD mode, the external cable should not exceed 12 m
• When running in SE mode, the external cable should not exceed 1.5 m.
NOTE
When connecting an external SCSI device, you must terminate the SCSI bus
by fitting an external terminator.
Cables
Internal SCSI cable
The internal SCSI cable is supplied with an embedded multi-mode
terminator at one end of it.
LED Activity cable
The LED cable supplies SCSI LED activity to the front panel hard disk LED.
For this to work, the SCSI LED cable must be connected to the LED Activity
connector on the Ultra 160 SCSI PCI Adapter card (refer to graphic on
page
87 ) and the SCSI LED connector on the system board.
The connectors on both ends of the cable are identical, hence they can be
connected to either connector.
SCSI Controller
The SCSI controller characteristics are as follows:
• PCI 64-bit 33 MHz.
• SCSI Multimode LVD/SE.
SCSI Bus
• LVDlink™ transceivers meet all of the SPI-2 standard requirements.
• Uses LSI Logic TolerANT
®
active negation technology for improved
single-ended SCSI signal integrity.
• Pre-fetches up to 8 words of SCSI SCRIPTS
®
instructions to save PCI bus
overhead.
• Supports multithreaded I/O algorithms in SCSI SCRIPTS with fast I/O
context switching.
SCSI LED
Connector