SCSI Cable Length

^{IBM-AUSTRIA - PC-HW-Support 30 Aug 1999}

SCSI Cable Length

SCSI Cable Length

The following table shows the maximum cable lengths for connecting SCSI devices, based on data-transmission rates.

NOTE: The maximum cable length for an external cable is determined by subtracting the length of the internal cable being used from the maximum length of SCSI cable that can be used based on the speed of the data transfer.

5MB Per Second or Slower Data Transmission Rates

NOTE: Maximum cable length - internal cable length = external cable length.

Table 4. Maximum External SCSI Cable Lengths

Maximum Length of SCSI cable = 6 meters (19.7 ft.) Length of 4-drop, SCSI narrow cable = 1 meter (3.3 ft.) Length of 7-drop, SCSI Fast/Wide cable = 1.5 meters (4.9 ft.) When a narrow internal cable is used, the maximum length of the SCSI external cable = 5 meters (16.4 ft.) 6 meters - 1 meter = 5 meters, or 19.7 ft. - 3.3 ft. = 16.4 ft. When a Fast/Wide internal cable is used, the maximum length of the SCSI external cable = 4.5 meters (14.8 ft.) 6 meters - 1.5 meter = 4.5 meters, or 19.7 ft. - 4.9 ft. = 14.8 ft.

Greater Than 5MB Per Second Data Transmission Rate

NOTE: Maximum cable length - internal cable length = external cable length.

Maximum Length of SCSI cable = 3 meters (9.8 ft.) Length of 4-drop, SCSI narrow cable = 1 meter (3.3 ft.) Length of 7-drop, SCSI Fast/Wide cable = 1.5 meters (4.9 ft.) When a narrow internal cable is used, the maximum length of the SCSI external cable = 2 meters (6.5 ft.) 3 meters - 1 meter = 2 meters, or 9.8 ft. - 3.3 ft. = 6.5 ft. When a Fast/Wide internal cable is used, the maximum length of the SCSI external cable = 1.5 meters (4.9 ft.) 3 meters - 1.5 meter = 1.5 meters, or 9.8 ft. - 4.9 ft. = 4.9 ft.

Table 4. Maximum External SCSI Cable Lengths

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