Digital Equipment EK-SFXXS-SG-003, Руководство по обслуживанию

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2–18 Theory of Operation
2.3.3 Front Panel Controls, Labels, and Indicators
The various controls and indicators on the storage enclosure allow you to
place the resident ISEs in a variety of operating states. These controls
and indicators connect to the ISE on the OCP 10-pin cable and the 5-pin
power cable. There are four sets of identical controls and indicators, one
set for each drive position in the storage enclosure. The following list is a
summary of these controls and indicators:
• DC power is controlled by means of one of four switches on the lower
front of the enclosure. Each switch has a status LED and an icon.
This icon shows the location of the drive position in the storage
enclosure.
• The Ready, Write Protect, and Fault buttons are on the OCP. Each of
these buttons has a switch element and a status LED.
— The Ready button is used to place the ISE on- and off-line; its
status LED is green. This LED is lit when the ISE is on-line.
— The Write Protect button is used to prevent data on the ISE from
being written over or erased; its status LED is yellow. This LED
is lit when the ISE is write-protected.
— The Fault button is used to display fault codes and to clear a ISE
fault; its status LED is red. This LED is lit when the ISE has
failed. When the Fault LED is lit, press the button to obtain the
fault codes for the disk ISE.
• Behind the front door of the OCP are two green LEDs and four
switchpacks.
— The top LED is TERM PWR (terminator power), which indicates
that the correct termination power is being supplied to that
enclosure.
— The bottom LED is SPLIT, which indicates that the enclosure is
operating in split-bus mode.
— The switchpacks, again one for each of the four drive positions in
the enclosure, are used to set the drive positions DSSI ID number
and the left-most to MSCP enable or disable that ISE. The icon on
the front of the door denotes the location of the drive position in
the storage enclosure.