Specifications

2-8 Cisco MGX 8220 Reference, Release 4.1
Power Entry Options
AC Powered Systems
In AC powered systems, a separate AC power assembly is required. (See Figure2-6 and Figure2-7.)
This assembly is rack mounted under the shelf cooling assembly in the rack and is available in both
a single and double AC source line version. The power assembly has a modular design and can be
configured with up to six power supply modules, each module providing 875 watts of 48 VDC
power. The power assembly can provide power for up to four MGX 8220 shelves, requiring three
power supply modules, or four for a (1 for N) redundant power supply configuration. The rear panel
has four connectors which supply 48 VDC power to the shelves. The first three (1A, 2A, and 3A)
connectors also provide power monitoring information to the MGX 8220 shelf. Another three
connectors (1B, 2B, and 3B) on the rear panel provide monitoring information for the second half of
the power supply. Special cables are used from the rear of the power assembly to the rear of the
shelves to feed power and monitor data to the shelves.
The AC power assembly measures:
• 5.25 inches (3u) high
• 17.45 inches wide
• 23 inches deep
Figure2-6 AC Power Assembly (front without grill)
Figure2-7 AC Power Assembly (rear)