IBM DS3500, Installation, User'S, And Maintenance Manual

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Figure 1-11 and Table 1-3 below show the location and describe the function of the dc power supply
connector pins.
Table 1-3. DC power supply connector - pin descriptions
Number Description
1 Pin 1: - 48 V dc
2 Pin 2: POS RTN
3 Pin 3: GND
Battery units
Each controller contains 1024 MB of cache memory (minimum). It also contains a sealed, rechargeable
lithium ion battery that maintains data in the cache so that it can be transferred to flash memory in the
event of a power failure.
Figure 1-12 shows the locations of the battery and memory cache DIMM in the controller.
Power
switch Power
connector Power
switch Power
connector
Figure 1-10. DC power supply components
Figure 1-11. DC power supply connector - pin positions
Battery connector
Captive fastener
Memory cache battery
Memory
cache DIMM
Host adapter
or filler panel
Figure 1-12. Battery unit
Chapter 1. Introduction
1-13