LSI 21003 - Manual (Page 15)

Interface Descriptions 1-5
1.3.3 SCSI Activity LED Interface
The SCSI activity LED interface is a four-wire arrangement that allows
connection of an LED harness to the board. The connector on the host
adapter is J6 for both channels. See
Table 3.8 on page 3-12 for the signal
name and pin numbers on this interface.
1.3.4 Cabling
The cable provided in the kit is matched for a Fast/Ultra/Ultra2/Ultra160
SE or LVD operation. This cable also has built-in multimode (SE/LVD)
termination since most Ultra160 hard disk drives are not made with
on-board LVD termination.
Table 1.1 lists standard cable specifications.
Table 1.1 Standard Cables
Maximum Bus Length, Meters
1
1. This parameter may be exceeded in point-to-point and engineered
applications.
STA Term SE LVD Maximum Devices
Wide Ultra SCSI 1.5 see note 2
2. LVD was not defined in the original SCSI standards for this speed. If all
devices on the bus support LVD, then 12-meter operation is possible at
this speed. However, if any device on the bus is SE only, then the entire
bus switches to SE mode, and the distances in the SE column apply.
8
Wide Ultra SCSI 3 see note 2 4
Wide Ultra2 SCSI see note
3
3. SE and High Voltage Differential (HVD) are not defined at greater than
Ultra speeds.
12 16
Ultra160 see note 3 12 16