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Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter
Power Entry Options
Typical Cisco MGX 8220 Hardware Weights
The typical hardware weights are shown in the following table:
Power Entry Options
DC Powered Systems
In DC-powered systems, Cisco MGX 8220 supports one or two power entry modules (PEMs) each of
which can be connected to its own independent 48V DC supply. The PEMs are installed horizontally,
side by side in the bottom rear of the shelf. (See Figure 2-3.) Each module is powered from a 48V DC
power source using three wires.
• Positive ground
• –48V DC
• Safety ground
The 48V DC cable is connected to the power entry module through a 3-position Euro-block connector.
The two modules provide power supply redundancy. Each power entry module is capable of supplying
enough power for a fully loaded Cisco MGX 8220 shelf.
An illustration of a PEM is shown in Figure 2-3.
Figure 2-3 Cisco MGX 8220 Power Entry Module
Hardware Weight (lbs)
Cisco MGX 8220 shelf with 16 boards 68
Cisco MGX 8220 main cooling unit 20
Cisco MGX 8220 booster cooling unit 14
Cisco MGX 8220 plenum 8
Average single Cisco MGX 8220 board 1.9
15
ON
OFF
DC connector
On switch (black)
Off switch (red)
+Return
Safety ground
-48V DC
H8245