#5074 PCI Expansion Tower The #5074 PCI Expansion Tower is attached to Models 820, 830, and 840 for adding up to 45 disk units (15 are “base”, 30 additional with #5101 or #5111), up to 11 PCI IOAs and up to two removable media units. The #5074 includes #9691 or #2739/#9739 bus adapter to provide the HSL interface to the system, a #9943 Base PCI IOP, space for two removable media devices, one battery backup, and redundant/hot swap power supplies. The #5074 is capable of controlling Ultra2 SCSI disk units. Select two (any combination) of the following HSL cables for the first tower on an HSL loop. For additional towers on an HSL loop, select one HSL cable per tower: #1460 - 3m Copper HSL Cable #1461 - 6m Copper HSL Cable #1462 - 15m Copper HSL Cable #1470 - 6m Optical HSL Cable #1471 - 30m Optical HSL Cable #1472 - 100m Optical HSL Cable #1473 - 250m Optical HSL Cable #1474 - 6m HSL to HSL-2 Cable #1475 - 10m HSL to HSL-2 Cable For the Model 810, if the #5074 attaches to HSL ports A0 or A1, the HSL cable cannot exceed 6m. For the Model 820, if the #5074 attaches to HSL port A1 of the system unit, the HSL connection to port A1 cannot exceed 6m. When a #5074 is present, one #1460 or #1461 must be selected. Select one of the following SPCN cables per tower: #0369 100m Optical SPCN Cable #1463 - 2m SPCN Cable #1464 - 6m SPCN Cable #1465 - 15m SPCN Cable #1466 - 30m SPCN Cable #1468 - 250m Optical SPCN Cable One #14xx power cord must be specified (geography dependent). Maximum: Six on the Model 520, 12 on the Model 550, 30 on the Model 570, 48 on the Model 595, five on the Model 820, 13 on Model 830, and 23 on Model 840, 47 on Model 890. The #5074 is also supported in Linux partitions with SUSE Linux Enterprise Server 9 for POWER or Red Hat Enterprise Linux AS for POWER Version 3. Supported on the Model 520 (9406 only), 550, 570, 595, 820, 830, 840, 890. The #5074 is a Customer Install Feature.