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Cisco AS5850 Universal Gateway Hardware Installation Guide
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Chapter1 Cisco AS5850 Product Overview
Field-Replaceable Units
maintenance bus (Mbus), which monitors voltage tolerance levels, temperature conditions, and power
failure in the enhanced AC-input power shelf. A grounding cable provides a ground connection from the
2400W AC-input power shelf to the chassis.
Figure 1-12 shows a rear view of a 2400W AC-input power shelf before installation.
Figure1-12 CiscoAS5850 240 0W AC-Input Power Shelf—Rear View
For detailed specification tables, refer to AppendixA, “Cisco AS5850 Specifications.”
Power Module Safety Features (2400W AC-Input Power Shelf)
The power modules in the enhanced 2400W AC-input power shelf have the following safety features:
•AC power modules installed in the enhanced AC-input power shelf are protected against overcurrent
by circuit breakers, and against overtemperature by internal protection circuits.
•A spring-clip locking mechanism in the ejector lever/handles holds individual AC power modules
in place, and prevents the power module from vibrating or sliding out of the power bay and
dislodging from the power backplane. A small flat-blade screwdriver is needed to delatch the AC
modules. Pulling on the handles without properly releasing the latches can damage the modules.
•Double grounding lugs (as per NEBS requirements) on both the enhanced AC-input power shelf and
the chassis provide electrical grounding.
•The power modules are self-monitoring. Each power module monitors its own temperature and
internal voltages. An internal fan in each power module draws cooling air from the front of the
power shelf, through the power module, and out the rear of the power shelf. The power module
airflow is separate from the rest of the CiscoAS5850 components.
Internal monitoring data is passed to the chassis through the maintenance bus (Mbus) monitoring
system. You can view this data through a terminal connected to the RSC console port. The command
to display the monitoring information is described in the CiscoAS5850 Universal Gateway
Operation, Administration, Maintenance, and Provisioning Guide, available online at:
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/as5850/sw_conf/5850oamp/
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