Seagate ST373207LC Cheetah 10K.7 SCSI Product Manual - Page 93

Table 20: Example Twist-n-flat cables - into a multi-drive backplane Cable description Differential impedance, nominal Singleended impedance, nominal Singleended capacitance, maximum Time delay, nominal Conductor DC resistance, nominal Maximum twist-n-flat cable length U320 U160 transfer rate transfer rate TPE, 22.25" twist, 1.75" flat, (24" flat to flat), 30 AWG solid tinned copper 131 ohms 93 ohms 15.3 pF/ft 1.45 ns/ft 0.105 ohms/ft 3.05 meters 6.1 meters (10.0 ft) (20.0 ft) TPE, 8.1" twist, 1.75" flat, (9.85" flat to flat), 30 AWG solid tinned copper 131 ohms 93 ohms 15.3 pF/ft 1.45 ns/ft 0.105 ohms/ft 2.45 meters 4.9 meters (8.33 ft) (16.66 ft) TPE, 4.25" twist, 1.75" flat, (6" flat to flat), 30 AWG solid tinned copper 131 ohms 93 ohms 15.3 pF/ft 1.45 ns/ft 0.105 ohms/ft 1.52 meters 3.04 meters (5.0 ft) (10.0 ft) 9.8 Terminator requirements Caution: These drives do not have onboard internal terminators. The user, systems integrator or host equipment manufacturer must provide a terminator arrangement external to the drive when termination is required. For LW drives, terminator modules can be purchased that plug between the SCSI I/O cable and the drive I/O connector or on the end of a short I/O cable stub extending past the last cable connector. LC drives are designed to be plugged into a backpanel connector without cabling. 9.9 Terminator power LW drives You can configure terminator power from the drive to the SCSI bus or have the host adaptor or other device supply terminator power to the external terminator. See Section 8.1 for illustrations that show how to place jumpers for this configuration. LC drives These drives cannot furnish terminator power because no conductors in the 80-pin I/O connector are devoted to terminator power. Cheetah 10K.7 SCSI Product Manual, Rev. D 83