Alcatel 7750 SR-12, Installation Manual

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Installing an AC Power Shelf
Page 76
7750 SR-12
I
NSTALLING AN
AC P
OWER
S
HELF
The AC power shelf converts AC power from an external AC power source into DC power that is
suitable for the 7750 SR-12 router. A 1:1 power shelf to PEM ratio exists with a maximum of two
shelves and two PEMs per chassis. Each power shelf supplies -52 VDC output power to one DC
PEM.
If you install a power shelf that was not provided by Alcatel, use a power shelf that is at least two
rack units high (3.5-inches, 8.88 cm) and can be mounted in a standard 19-inch equipment rack or
telco-type rack. Install the AC power shelf directly below your 7750 SR-12 or in an adjacent rack
and make sure you are able to connect the power cables to the router.
AC input power, DC output power, and status are provided with cable connections from the rear of
the power shelf. Individual power cables connect each AC power rectifier to the AC input power
source. Each AC power shelf provides DC-interconnect cables to provide DC output power (-48
DC) to the DC PEMs.
In internal fan in each rectifier circulates air from the front of the shelf, through the power module,
and out through rear vents.
Notes: Follow the manufacturer’s instructions to install AC power shelves.