Multimode Scsi Termination; Combination Cd-Rom And Floppy Drive - Compaq AlphaServer DS20E Reference Manual

Multimode SCSI Termination

The storage system backplane contains on-board multimode terminators.
These devices provide LVD (Low Voltage Differential) termination to the bus
when all devices are LVD. If a SE (Single Ended) device is installed in the
backplane, the terminators will automatically switch to SE mode termination.
This causes all devices on the bus to operate in SE mode, and restrict all
transactions to SE speed and length limitations.
If a dual controller system is constructed, the second controller may be
connected to the last backplane in the chain. In this mode, the termination is
provided by the second controller and all backplane terminators are disabled.
Combination CD-ROM and
Floppy Drive
The combination IDE CD-ROM and floppy drive is located to the right of the
storage subsystem in a rack system, and is under the top spare drive bay in a
pedestal system. Figure 7-12 shows the location of the activity LEDs for the
CD-ROM and floppy drives.
Figure 7-12. Combination Drive LED Locations
Compaq Confidential – Need to Know Required
Writer: Robert Young Project: Compaq AlphaServer DS20E System Comments:
Part Number: ER-K8F6W-UA .A01 File Name: h-ch7 Using the Storage Subsystem.doc Last Saved On: 10/4/99 11:13 AM
Activity LED
Activity LED
Using the Storage Subsystem 7-19
CAT0016