Adaptec 39320A-R Installation Guide - Page 2

Introduction The Adaptec SCSI Card 39320A enables you to connect up to 30 SCSI devices-such as very large arrays of high-performance hard disk drives, external storage subsystems, Ultra320/160 hard disk drives, scanners, and CD-ROM drives-to any Intel-based computer with 64- or 32-bit PCI/PCI-X expansion slots. The Adaptec SCSI Card 39320A has two independent SCSI channels with a maximum throughput of 320 MB/sec per SCSI channel. SCSI Channel A (marked CH A on the card) has one internal 68-pin Low Voltage Differential/Single-Ended (LVD/SE) connector and one external 68-pin very high-density cable interconnect (VHDCI) connector. SCSI Channel B (marked CH B on the card) has one internal 68-pin LVD/SE connector and one external 68-pin VHDCI connector. 68-pin internal LVD/SE connector Channel A 68-pin internal LVD/SE connector Channel B 68-pin external LVD/SE VHDCI connector Channel A 68-pin external LVD/SE VHDCI connector Channel B You can connect Ultra320/160 and Ultra2 SCSI devices to the 68-pin LVD connectors on both SCSI channels. When connecting these newer devices along with older legacy SCSI devices, Adaptec recommends that you dedicate them as separate channels. See Support for Older SCSI Devices on page 2 for more information. Although the Adaptec SCSI Card 39320A is a 64-bit PCI/PCI-X card, it also works in a 32-bit PCI slot. When installed in a 32-bit PCI slot, the card automatically runs in the slower 32-bit mode. 1