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ASUS P2B-D2 User’s Manual 33
III. INSTALLATION
Connectors
III. INSTALLATION
22. 50 pin Narrow/68 pin Wide/68 pin Ultra2 SCSI Connectors
This motherboard has onboard 50-Pin Narrow SCSI connector for 8-bit SCSI
devices, 68-Pin Wide SCSI connector for 16-bit SCSI devices, and 68-Pin Ul-
tra2 SCSI connector for 16-bit differential SCSI devices.
P2B-D2 Onboard SCSI Connectors
50-pin Narrow
SCSI Connector
68-pin Ultra2
SCSI Connector
68-pin Wide
SCSI Connector
1
35
34
68
1
35
34
68
NOTE: A maximum of 15 devices can be connected using any combination of 50-
pin Narrow SCSI, 68-pin Wide SCSI, and 68-pin Ultra2 SCSI devices.
The onboard Adaptec AIC-7890AB chipset incorporates an advanced multimode I/O cell that
supports both single-ended (SE) and Ultra2 devices. With Ultra2 devices, the SCSI bus plat-
form performs at full Ultra2 speeds (up to 40 MB/sec in 8-bit mode and up to 80 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 Ultra2 and SE devices, the onboard host adapter can be coupled
with the Adaptec AIC-3860 transceiver chipset to bridge the compatibility gap. By dividing
the SCSI bus into independent SE and low voltage differential (LVD) segments, the trans-
ceiver chipset supports legacy devices without limiting performance and cable length on the
LVD segment.
IMPORTANT: Connect SCSI devices as shown. Mixing SCSI devices will lower
performance.
P2B-D2 SCSI Connection
Disk 2 Disk 3Disk 1
Disk 2 Disk 3Disk 1
68-pin Ultra2
Scanner TapeCD-ROM
(Terminated)
(Terminated)
50-pin Narrow
68-pin Wide
Terminator
NOTE: Ultra2 devices do not have termination jumpers and must use a separate
terminator on the last connector.