Seagate ST118202LW/LC manual Cable characteristics for SE and LVD circuits

24 Cheetah 18 Installation Guide, Rev. A

can use these wide drives on a standard (non-wide) 8-bit data bus if you provide proper termination to the upper 8-bit data lines. This is often referred to as providing “high-9 termina- tion.”

Figures 3, 4, and 5 show typical drive connections.

The following table lists the maximum cable lengths and number of devices using single-ended and LVD I/O circuits allowed on a daisy-chain cable for 10, 20, and 40 Mtransfers/sec I/O data transfer rates.

Table 1.	Cable characteristics for SE and LVD circuits
SCSI		Maximum
		number of
driver	I/O transfer rate		Maximum cable
		devices on
type	(Mtransfers/s)		length allowed
		bus
SE	10	16	6 meters (19.7 ft.)
SE	20	4	3 meters (9.8 ft.)
SE	20	8	1.5 meters (4.9 ft.)
LVD	40	16	12 meters (39.4 ft.)

A maximum of 16 devices can be connected on a 16-bit wide data bus.