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Specifications
Installation and Operation
149
SCSI cable specifications
The following table lists the recommendations for external SCSI
cables for the narrow SCSI library.
For the wide SCSI library, use cables that conform to SCSI-3
specifications.
Cable feature Requirement
Standard
Construction
50 conductors (25 twisted pairs with drain wire
and shield)
Primary
Conductors
Gauge:
# 28 AWG minimum stranded (7/34) annealed,
tinned copper
Insulation:
Polypropylene (80
°
C) 0.010 inch nominal
Shielding 80% minimum tinned copper braid over
aluminum/mylar foil
Voltage Rating 30 VAC
Impedance Single-ended: 88 Ohms ± 8 Ohms
Differential: 130 Ohms ± 12 Ohms
Grounding Case-to-case grounding
Connector 50-contact AMP Amplimite 0.050 male,
shielded, SCSI-2 connector