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Cisco AS5850 Universal Gateway Hardware Installation Guide
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Chapter1 Cisco AS5850 Product Overview
Field-Replaceable Units
Figure 1-10 GBIC Mo dule
DC-Input Power Entry ModuleThe Cisco AS5850 is equipped with two power-entry modules (PEMFs), which accept DC-input power
either from your site DC source or from an optional AC-input power shelf, and distribute –48 VDC to
–60 VDC power to the chassis components using the backplane. The PEMFs provide power redundancy
and load-sharing; however, a single PEMF can power a fully configured system. The PEMF also contains
a passive DC power filter, which includes a broadband electromagnetic interference (EMI) filter and
circuitry for monitoring power coming into the chassis.
Note Whenever possible, you should connect each PEMF to a separate DC power source.
The PEMFs are cooled by system airflow, which flows from the top to the back of the chassis. The front
and sides of the PEMFs are perforated for minimum airflow restriction.
The PEMFs support the following functions:
•Power redundancy and load sharing
The DC-input power supply provides redundant power by design. During normal operation, the two
PEMFs provide system power simultaneously (load share). When you remove one PEMF, the
remaining PEMF immediately ramps up to provide full power and maintain uninterrupted system
power.
•System environmental monitoring
A 24-pin connector monitors system environmental status and communicates this status from each
PEMF using the maintenance bus (Mbus). Table 1 -11 lists connector pins supporting system status
signals.
Table1-10 GBIC Types
GBIC Product Number
1000BASE-SX WS-G5484
1000BASE-LX/LH WS-G5486
11825
Receiver Transmitter