Asus P3C-D User Manual download pdf (Page 51)

ASUS P3C-L / P3C-S / P3C-LS User’s Manual 51

3. HARDWARE SETUP

Connectors

3. H/W SETUP

SCSI Connection and Termination Information

Each SCSI channel is like a water hose where the inside must be opened and the

ends must be closed. Each connector, whether 68 pins or 50 pins may have single or

double-ended configurations. For Single-Ended configurations, the Termination for

that particular channel must be set to Enabled in 4.4.3 PCI Configuration. For

Double-ended configurations, the Termination for that particular channel must be

set to Disabled in 4.4.3 PCI Configuration. Each channel may have up to 15 de-

vices (ID#0-15, with #7 reserved for the chipset).

The onboard Adaptec AIC-7892B chipset (optional) incorporates an advanced

multimode I/O cell that supports both single-ended (SE) and low voltage differential

(LVD) devices. With Ultra160 devices, the SCSI bus platform performs at full Ul-

tra160 speeds (up to 80 MB/sec in 8-bit mode and up to 160 MB/sec in 16-bit mode)

and extended cabling 12m (or 25m in a point-to-point configuration). When an SE

device is attached, the bus defaults to an SE speed and cable length.

In mixed environments of LVD and SE devices, the onboard host adapter can be coupled

with the Adaptec AIC-3860Q transceiver chipset (optional) to bridge the compatibility

gap. By dividing the SCSI bus into independent SE and low voltage differential (LVD)

segments, the transceiver chipset supports legacy devices without limiting performance

and cable length on the LVD segment.

NOTE: Ultra160 devices do not have termination jumpers so a terminator block on

the SCSI cable is needed. If your end devices have its own termination, you may use

it instead.

SCSI Connection Examples

P3C-LS/L/S Mixed LVD

and Single-Ended Device Configurations

P3C-LS / L / S

LVD Devices

Single-Ended Devices

Scanner Tape

Disk 2 Disk 3Disk 1

CD-ROM

PCI Bus

Adaptec

AIC-3860Q

Chipset

Adaptec

AIC-7892B

Chipset

LVD Mode

Wide SCSI Connector

Ultra160 SCSI

Connector

PCI-to-Ultra3 (LVD)

SE Mode

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Asus P3C-D User Manual Page 51

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