Alcatel 7750 SR-12, Руководство по установке

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Chassis Features
Page 26
7750 SR-12
C
HASSIS
C
OMPONENTS
7750 SR-12 chassis contain the following components:
• Power Supplies on page 26
→
DC Power Entry Modules on page 27
→
AC Power Supply Modules on page 28
• Cooling System on page 29
• Air Filter on page 30
• Blank Panels on page 30
P
OWER
S
UPPLIES
Two types of redundant power supplies can be used with 7750 SR-12 routers. Two slots in the
chassis are designated for hot swappable, load-sharing, DC power entry modules (PEMs).
AC power can be converted to DC power using external AC power supply modules (PSMs) or
rectifiers available from Alcatel.
P
OWER
R
EDUNDANCY
At least one DC PEM must be installed in the 7750 SR-12 chassis to operate. An additional PEM
can be installed for power redundancy.
I
f you need to convert AC power to usable DC power, up to two rectifiers can be installed in the
same AC power shelf and connected to a DC PEM.
For redundant operation, a second AC power shelf can be installed. This power shelf must connect
to the second PEM. This ensures that the second DC PEM has an independent redundant source.
The number of AC power shelves and rectifiers necessary depends on your configuration and the
power requirements for each IOM and MDA. Certain chassis configurations require less power,
thus requiring fewer rectifiers. Some configurations require redundant power, thus requiring an
additional AC power shelf with rectifiers.