LSI SYM8953U manual Scsi Bus Lengths, Lvd

You can connect up to four devices if they are evenly spaced on a

3-meter Ultra SCSI cable (0.75 m between devices). Your SE SCSI bus should not exceed 3 meters (total internal and external cable lengths), even with fewer than four devices.

For LVD applications, you can connect up to 16 devices including the host adapter if they are evenly spaced on a 12-meter Ultra SCSI cable (0.19 m minimum between devices).

Table 2.2	SCSI Bus Lengths
		Maximum Bus Length, Meters1
					Maximum #
		SE	Differential	LVD	of Devices
SCSI-1		6	25	12	8
Fast SCSI		3	25	12	8
Fast Wide SCSI		3	25	12	16
Ultra SCSI		1.52	25	12	8
Ultra SCSI		32	–	–	4
Wide Ultra SCSI		–	25	12	16
Wide Ultra SCSI		1.5	–	–	8
Wide Ultra SCSI		3	–	–	4
Ultra2 SCSI		Note3	Note3	12	8
Wide Ultra2 SCSI		Note3	Note3	12	16

1.This parameter may be exceeded in point-to-point and engineered applications.

2.Additional spacing rules apply.

3.SE and high power differential are not defined at Ultra2 speeds.

2-8 Installing the SYM8953U Host Adapter