Power Supplies And Redundancy - Alcatel 7450 ESS-7 Installation Manual

Chassis Features
C C
HASSIS OMPONENTS
The 7450 ESS-7 chassis contains the following components:
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P S
OWER UPPLIES AND
The 7450 ESS-7 chassis is designed to accommodate swappable, load-sharing power modules
(Figure
power entry module (PEM) can support the full system current requirements if you are operating
the 7450 ESS-7 without power redundancy. The PSM is also referred to as an AC-to-DC power
converter. For redundancy, two DC PEMs or the combination of two PSMs (for AC-to-DC power
conversion) and two AC PEMs must be installed and powered on at all times.
DC P E M
OWER NTRY
DC PEMs
modules are installed in power bays 1 and 2. One PEM can support the full system current
requirements if you are operating the 7450 ESS-7 without power redundancy. For redundancy, two
PEMs must be installed and powered on at all times.
Always operate an energized chassis with the safety cover installed over the DC power terminal
block to prevent contact with hazardous voltages and currents and to prevent accidental removal.
DC power cables are not shipped with each PEM. Verify the power cable is compliant with your
local safety codes. PEMs are packaged and shipped separately. Refer to
on page 66
PEMs have no field replaceable parts. The entire unit must be replaced in the event of a failure.
Page 26
Power Supplies and Redundancy on page 26
→
DC Power Entry Modules on page 26
→
AC Power Entry Modules on page 29
Fan Trays on page 30
Air Filter on page 31
Blank Panels on page 31
R
EDUNDANCY
8). One DC PEM or the combination of one AC power supply module (PSM) and AC
ODULES
(Figure 6) are easily installed and removed from the rear of the 7450 ESS-7 chassis. DC
for requirements and information to preparing cables.
Preparing the Power Cable
7450 ESS-7