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The maximum length of the SCSI cable is as follows. If more than one SCSI device is
connected, the total length must not exceed 6 m.
A 25-pair twisted-pair cable satisfying the following requirements is recommended for the SCSI
cable:
Table 3.5 SCSI cable requirements
Item Single-Ended type
Conductor size 28 AWG or larger
Characteristic impedance
100 to 132 Ω
Each pair of wires must be connected to pins n and n + 1 (where n is an odd number) on the
interface connector. All cables used on the same SCSI must have the same characteristic
impedance to reduce signal reflection and to maintain transmission characteristics.
When an SCSI device is not connected to an end of the SCSI cable, connection to the SCSI
connector must be at a branching point of the cable. If an SCSI device is connected to an end of
the SCSI bus, any excess cable length after the last SCSI device must be terminated with a
resistor. (See Figure 3.18.)