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EMC Symmetrix DMX-3 Product Guide
Symmetrix DMX-3 Hardware
Symmetrix DMX-3 power subsystems
The Symmetrix DMX-3 power subsystem uses a 2N power
architecture.The Symmetrix DMX-3 power subsystem includes the
following features in the system bay and storage bay:
â—† 2N power zones
â—† Dual-line cords, one for each zone per bay, providing on/off
function
â—† BBU modules with internal chargers and electronic status
reporting
The DMX-3 power subsystem architecture provides two completely
separate power zones (Power Zone A and Power Zone B), each of
which can maintain power for an entire system bay or storage bay
independent of the operation of the second zone. There is no
redundancy within each zone, rather the redundancy is
accomplished through the two-zone design.
System bay power
subsystem
components
The system bay contains up to eight power supplies that are split into
two power zones—Power Zone A and Power Zone B, consisting of
up to four power supplies each. The system bay also contains up to
eight Battery Backup Unit (BBU) modules providing battery backup
in the event an AC failure occurs. One BBU provides the AC line
power, and high voltage DC backup to one power supply. The A side
BBU modules receive their power from the A side Power Distribution
Unit (PDU) and the B side BBU modules receive their power from the
B side PDU shown in Figure 14 on page 88. Two Power Distribution
Panels (PDPs), one for each zone, provide a centralized cabinet
interface and distribution control of the AC power input lines when
connected to the system bay PDUs. The PDPs contain the manual
On/Off power switches, which are accessible through the rear door.
The DMX-3 system bay PDPs are available in three-phase Delta and
three-phase WYE configurations.
Through an RS-232 interface, the XCM modules communicate with
the system bay BBU modules to determine the BBU status and run
battery tests.
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