HP SW TL881 DLT Mini-Lib/1 Compaq StorageWorks TL881/TL891 Family MiniLibrary - Page 105

3-24 Compaq StorageWorks TL881/TL891 Family MiniLibrary System Reference Guide Interface Cable Specifications The MiniLibrary is a high-performance system. To avoid degradation of performance, use the highest-quality interface cables. The detailed requirements for SCSI cables are set forth in ANSI X3.131-1994. All SCSI cables used with the MiniLibrary module meet at least the following requirements: I Shielded or double-shielded, as required to meet EMI specifications I Impedance match with cable terminators of 132 Ω I Characteristic impedance between 90 and 132 Ω, required I Each end of the twisted pair ground must be connected to chassis ground. I The maximum cable length for a single-ended Fast SCSI bus is 9.8 ft (3 m). I The maximum cable length for a differential Fast SCSI bus is 82 ft (25 m). NOTE: See Appendix H, "Interconnect Characteristics for Signals," for LVD/SE, SE, and HVD recommended minimum conductor sizes. IMPORTANT: When calculating the overall length of the bus, be sure to include the internal cabling of the module, as follows: I MiniLibrary Base Module: TL881: DLT0 DLT1 19 in (48 cm) 27 in (69 cm) TL891/DLT8000: DLT0 17 in (43 cm) DLT1 26 in (66 cm) SCSI Jumper: 12 in (30 cm) Robotics Control: Wide SCSI 35 in (89 cm)