SCSI Physical Characteristics
Chapter 5
Technical Reference Manual
Page 57
Cable Requirements
A 50 conductor cable no more than 6 meters (19.68 feet) cumulative length with
at least 28 AWG wire size and a characteristic impedance of 70 to 100 ohms (84
ohms nominal) is required. In systems which use the fast synchronous transfer
option, the cable should meet the following additional requirements:
Table 5-12
Interface Cable Electrical Characteristics
Specification
Value
Signal Attenuation
0.095dB maximum per meter at 5 Mhz
Pair-to-Pair Propagation Delay Delta
0.20 ns maximum per meter
DC Resistance
0.230 ohms maximum per meter at 20
°
C
