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Cisco AS5850 Universal Gateway Hardware Installation Guide
78-10573-06 0A
Chapter 1 Cisco AS5850 Product Overview
Field-Replaceable Units
The PEMFs contain two LEDs on the front panel—POWER and MISWIRE. The POWER LED indicates
that input voltage is present and the PEMF circuit breaker is on; the MISWIRE LED should remain off,
but comes on if the two DC conductors entering the PEMF DC-input power terminal block (see
Figure 1-2) are reversed. If the POWER LED does not light, one of the output voltages is not present on
the PEMF (–48V, 5.1V, 1.6V).
For detailed specification tables, refer to Appendix A, “Cisco AS5850 Specifications.”
2400W AC-Input Power Shelf
The 2400W AC-input power shelf includes three 1200-watt (W) AC-input power modules that plug into
a common power backplane in the 2400W AC-input power shelf. Two 1200W AC-input power modules
are capable of powering a fully configured Cisco AS5850. The third power module provides full
redundancy.
During normal operation, the three AC-input power modules provide automatic load-sharing, with each
power module supporting 33 percent of the power load. When you remove one of the AC-input power
modules, the remaining power modules immediately ramp up to full power and maintain uninterrupted
system power.
Note The AC-input power modules in the 2400W AC-input power shelf are hot-swappable, allowing you
to remove or replace a power module while the system is operating; system operation will not be
affected. Whenever possible, Cisco recommends that you connect each AC-input power module to a
separate AC power source.
Each AC-input power module is powered on automatically when it is plugged in and receiving power.
Ejector lever/handles secure each power module to the backplane connectors and allow you to remove
and replace the power modules with ease.
Figure 1-11 shows a front view of a 2400W AC-input power shelf installed in a four-post rack.
Figure 1-11 Cisco AS5850 2400W AC-Input Power Shelf—Front View
The 2400W AC-input power shelf is two rack units high (3.5 in. [8.88 cm]) and mounts underneath the
chassis in a standard 19-inch 4-post or telco-type rack assembly.
All cable connections for AC-input power, DC-output power, and status signals are made from the
2400W AC-input power shelf rear. (See Figure 1-12.) Three modular power cables connect each
AC-input power module to the site AC-input power source. Two DC-interconnect cables provide
DC-output power to the chassis. Two monitor cables provide a status signal connection to the PEMF
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