Seagate ST15150N Product Manual - Page 80
Connector requirements
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70 11.7.1.2.3 11.7.2 ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D General cable characteristics In general, cables having the characteristic impedances given in Sections 11.7.1.2.1 and 11.7.1.2.2 are not available; however, impedances that are somewhat lower are satisfactory. A characteristic impedance of 100 ohm +10% is recommended for non-shielded flat or twisted-pair ribbon cable. However, most available cables have a somewhat lower characteristic impedance. To minimize discontinuities and signal reflections, cables of different impedances should not be used in the same bus. Your specific setup may require tradeoffs in shielding effectiveness, cable length, the number of loads, transfer rates, and cost to achieve satisfactory system operation. If shielded and non-shielded cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered. Proper impedance matching is especially important to maintain adequate margin at fast SCSI transfer rates. Only non-shielded cable connectors are applicable for N and ND drives. A 50-conductor flat cable or 25 twisted-pair cable is used. A minimum conductor size of 28 AWG should be used to minimize noise effects. Suggested nonshielded flat cable part numbers are: Flat cable, 35M-3365-50 Twisted pair, Spectra Twist in flat 455-248-50 Equivalent parts may be used. Connector requirements ST15150N/ND drives The non-shielded cable connector is a 50-conductor connector consisting of two rows of 25 female contacts with adjacent contents 100 mils apart. Recommended mating flat cable connectors part numbers: Closed end 3M-3425-7000 without strain relief, no center key (for cable ends) 3M-3425-7050 with strain relief, no center key Berg-66900-290 with strain relief, with center key Open end (in daisy chain) 3M-3425-6000 without strain relief, no center key 3M-3425-6050 with strain relief, no center key Berg-66900-250 with strain relief, with center key The drive device connector is a non-shielded 50-conductor connector consisting of two rows of 25 male pins with adjacent pins 100 mils apart. The connector is keyed (see Figure 33). Mating panel mount connector 3M-CHE-2050-J01A10-KLE ST15150W/WD drives Recommended mating wide cable connectors part numbers: AMP 786096-7, female 68-pin AMP 786090-7, male 68-pin