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Chapter 2: Hardware information
5. Ultra160 SCSI connector (SCSIB)
This motherboard has two 68-Pin Ultra160 SCSI connectors, one
internal and one external (see section “1.4 Motherboard overview” for
details on the external SCSI connector). The SCSI connectors can
support a maximum of 15 devices as specified by Ultra160 standards.
SCSI Connection Notes
The onboard SCSI chipset incorporates an advanced multimode I/O cell
that supports both single-ended (SE), Ultra2, and Ultra160 devices. With
Ultra160 devices, the SCSI bus platform performs at full Ultra160 speeds
(up to 160MB/s) 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 1.5m cable length.
Connect SCSI devices as shown. Each channel should have only one
type of SCSI standard (e.g. Ultra160, Ultra2, Ultra-Wide). Mixing SCSI
devices on the same channel decreases performance of the slower
device.
NR-LSR
®
NR-LSR Onboard SCSI Connectors
HDSCSI
68-Pin Ultra160/
Ultra2-Wide SCSI Connector
SCSI-B
68-Pin Ultra160/
Ultra2-Wide SCSI Connector
35 68
341
35
6834
1
NR-LSR
®
NR-LSR SCSI Connection Example
68-pin Internal SCSI Cable (Twisted-Pair Ribbon)
68-pin Female
Terminator
Internal SCSI Devices (up to 15 devices)
Channel B
68-pin Internal SCSI Cable (Twisted-Pair Ribbon)
68-pin Female
Terminator
Internal SCSI Devices (up to 15 devices)
Channel A