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.025" Pitch 68 Conductor (Wide) SCSI Cable Application
Recommendations
SCSI Type Wide bus
data
transfer
rate
Recommended
Cable
Description Nominal
Impedance
SE (Dif)
Notes:
Fast
(Ultra
SCSI)
40 MBytes 125-3011-068
30 awg solid TPE, twisted pair 90 (130) 3
125-3001-068 30 awg solid PVC, twisted pair 90 (115) 3
125-3098-999 30 awg solid PVC, twisted pair 90 (115) 3
193-3099-988 30 awg solid TPE ZIP 90 (125) 1
125-3099-999 30 awg stranded PVC,
twisted pair
80 (110) 3
125-3007-068 30 awg stranded PVC,
twisted pair
80 (110) 3
125-3096-996 30 awg solid TPE, twisted pair 90 (130) 3
193-3099-986 (SCA) 30 awg solid TPE, TPE ZIP 90 (125) 1
Fast 40
(Ultra 2
SCSI)
80 MBytes 125-3011-068 30 awg solid TPE, twisted pair 90 (130) 3
125-3001-068 30 awg stranded PVC, twisted pair 90 (115) 3
125-3098-999 30 awg solid PVC, twisted pair 90 (115) 3
125-3099-999 30 awg stranded PVC,
twisted pair
80 (110) 3
125-3007-068 30 awg stranded PVC,
twisted pair
80 (110) 3
125-3096-996 30 awg solid TPE, twisted pair 90 (130) 3
Fast 80
(Ultra 3
SCSI)
160 MBytes 125-3011-068 30 awg solid TPE, twisted pair 90 (130) 3
125-3096-996 30 awg solid TPE, twisted pair 90 (130) 3
SPI-4
Fast 160
(Ultra 320)
320Mbytes 125-3097-998 Ultra 320 Compliant Flat, 30 AWG stranded, TPO, 9.85 90 (122) 3
125-3017-068 Ultra 320 Compliant Flat, 30 AWG stranded, TPO, 5.25 90 (122) 3
125-3096-899 Ultra 320 Compliant Flat, 30 AWG solid, TPO, 9.85 90 (122) 3
125-3096-900 Ultra 320 Compliant Flat, 30 AWG solid, TPO, 5.25 90 (122) 3

General Considerations:

1. ZIP type parallel conductor constructions afford the lowest cost and overall ease of termination. They are significantly less costly than Teflon FEP constructions, with only slightly lower impedance. ZIP cable use should be limited to areas where they can be routed away from noise aggressors such as CPU's, fans, and power supplies. Due to their parallel construction, they do not have good crosstalk isolation and common mode noise rejection.

2. Loose Pair constructions afford a maximum of cable flexibility and routability in bus applications requiring good air flow for heat dissipation. Their twisted pair construction yields good common mode noise rejection and crosstalk isolation. However, impedance control is not as tight as fully laminated twisted pair designs.

3. Fully Laminated twisted pair constructions afford good control of impedance, skew, and crosstalk due to precise placement of the twisted pairs. The dual lamination (top and bottom of the pair) allows the cable to be bent and folded without delamination and subsequent cable failure. Folding and creasing of this type of cable should be minimized at Ultra320 data rates in order to avoid reflections caused by impedance discontinuities.

4. OptiClearTM is recommended for Ultra320 applications where the cable must be round for maximum airflow and cable routability, while retaining the consistent electrical performance required of Ultra320 signaling.