IBM EXP400 Type 1733, Руководство по техническому обслуживанию и ремонту

Страница: 18 / 98

Rear view: ESMs
The ESMs are accessible from the back of the expansion unit. These components
contains user controls, LEDs, switches, and connectors as shown in the following
illustration.
Note: The ESM on the right side is optional on expansion unit models 1RU and
1RX.
ESM Each ESM contain SCSI controls, LEDs, and connectors.
Fault LED (amber)
When lit, this amber LED indicates an ESM failure.
SCSI reset LED
When lit, this green LED indicates a SCSI bus reset.
Thumbscrews
Each ESM has a thumbscrew on the left side of the module. Use the
thumbscrew and lever to remove and insert the ESM.
Termination-power LED (green)
When lit, this green LED indicates that termination power is present. When
a termination-power LED is lit, it indicates that the other end of the SCSI
bus connector is connected to a powered-on controller. Each external bus
has a separate termination-power LED.
LVD/SE LED (green)
When lit, this green LED indicates that the external host bus is in low
voltage differential (LVD) mode. When this LED is off, it indicates that the
external host bus is in single-ended (SE) mode. Each external bus has a
separate LVD/SE LED. Only LVD host bus controllers are supported.
SCSI bus connector
The 68-pin Very High Density Connector Interface (VHDCI) connectors are
for connecting your SCSI cables to SCSI bus 1 and SCSI bus 2.
Activity LED (green)
When lit, this green LED indicates there is activity on the external SCSI
bus. Both external buses have a separate activity LED.
Termination-power
LED (green)
Termination-power
LED (green)
LVD/SE
LED (green)
LVD/SE
LED (green)
SCSI Bus
connector 2
SCSI Bus
connector 1
Activity LED
(green)
Activity LED
(green)
ESM
ESM
Thumbscrew
SCSI reset
LED (green)
SCSI reset
LED (green)
Fault LED
(amber) Fault LED
(amber)
Box ID switch (SW2) Configuration switch (SW1)
Switch cover
10
IBM EXP400 Storage Expansion Unit Type 1733: Hardware Maintenance Manual and Troubleshooting Guide