2-4 Cisco BPX 8600 Series Reference
Physical Description
Nodes may be equipped with either a single PEM or dual PEMs for redundancy. They are mounted
at the back of the node below the backplane. A conduit hookup box or an insulated cover plate is
provided for terminating conduit or wire at the DC power input. It is recommended that the source
of DC for the node be redundant and separately fused.
Figure 2-3 DC Power Entry Module Shown with Conduit Box Removed
Optional AC Power Supply Assembly
For applications requiring operation from an AC power source, an optional AC Power Supply
Assembly and shelf is available. It provides a source of –48 VDC from 208/240 VAC input. A shelf,
separate from the BPX switch shelf, houses one or two AC Power Supplies and mounts directly
below the node cabinet. This provides a secure enclosure for the power supply assemblies (supplies
cannot be removed without the use of tools).
Two of these supplies are usually operated in parallel for fail-safe redundant operation. The front of
the AC Power Supplies for the BPX switch includes two green LEDs to indicate correct range of the
AC input and the DC output for each individual supply (see Figure 2-4).
+RTN
–48V
SAFETY
GROUND
CB1
ON
OFF
USE COPPER
CONDUCTORS ONLY
DC Terminal
Block
H8019
Plastic
Cover
