User guide

13
Chapter 2 - Installation Quick Start
Backplane Board
The user configurable backplane shown in Figure 2-2 allows you to combine subsegments (2-
card slots, i.e., SUB 1 NIC and CPU with SUB2 NIC and CPU) into a 4-slot segment. The first
two segments can be combined into a 6-slot segment along with the second and remaining three
segments being combined into 4-slot segments. Combining the first two segments is
accomplished by inserting a bus jumper circuit board (see Figure 2-3) into connector P5.
Inserting a bus jumper circuit board into connectors P2 through P4 converts the remaining
segments into 4-slot segments. Power can be individually switched on each subsegment
enabling an individual subsegment to be powered down rather than the complete backplane. The
voltage LEDs along the right edge are for power to segments 1-3. The LEDs along the left edge
are for power to segments 4 and 5.
12V
5V
-5V
-12V
12V
5V
-5V
-12V
Segment 5 Segment 4 Segment 3 Segment 2 Segment 1
CPUCPUCPUCPUCPUCPUCPUCPUCPU NICNICNICNICNIC NICNICNICNIC
P1 P5 P2 P3 P4
123456789
Figure 2-2. User Configurable Backplane
The four-pin molex connectors on the front end of the backplane (labeled 1-9) are used to
connect power to the drive in the horizontal disk drive chassis (1) and the drives in the 8-bay disk
drive chassis (2-9). The associated power cables (pre-attached) are Y cables that allow for
connection to either a floppy or hard drive, and have been labeled on both ends for ease of
installation.
The four 4-slot segments (SEGMENT 2 through SEGMENT 5) can have any combination of four
boards, with the exception that a SBC needs to be in the first slot to the left of the bus jumper
circuit board. To activate a 4-slot segment, all you have to do is install the bus jumper circuit
board (MTCLUSTER2-1) in connector P1 to make SEGMENT 2 a 4-slot segment, in P2 for
SEGMENT 3, P3 for SEGMENT 4 and P4 for SEGMENT 5 and apply power to the subsegments
(both subsegments must be powered on). The bus jumper circuit board shown in Figure 2-3
takes all the signals, except power, from one 2-slot segment and jumpers them to the next 2-slot
segment.
MTCLUSTER2-1
Front
Figure 2-3. Bus Jumper Circuit Board