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1-8
Cisco Catalyst 4900M Switch Installation Guide
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Chapter 1 Product Overview
Catalyst 4900M Half-Card Modules
For safety reasons, the AC power supply must be switched off and unplugged before it is removed from
a chassis or inserted into a chassis. DC supplies should have power shut off from the source before they
are removed.
If only one power supply is used, you must use the supplied blank faceplate to cover the empty power
bay. The blank power supply cover maintains EMI shielding and proper air flow through the chassis.
Environmental Monitoring of the Power Supplies
Using the environmental monitoring and reporting functions, you can maintain normal system operation
by resolving adverse environmental conditions prior to loss of operation.
Each power supply monitors its own temperature and output vo ltages. The Catalyst 4900M switch senses
the operating condition of the power supply and reports status through software.
Power Management for the Catalyst 4900M Switch
You can select either AC-input or DC-input power su pplies for your switch. The Catalyst 4900M switch
supports the following power supplies:
• 1000 W AC-input
• 1000 W DC-input
A redundant power supply can be identified and diagnosed by a running system regardless of its input
status. The AC-input and DC-input supplies are interchangeable.
Power Management Modes
The Catalyst 4900M switch supports the redundant power management mode. In this mode, if both
power supplies are operating normally, each provides from 20/80 to 45/55 percent of the total system
power requirements at all times. If one power supply fails, the other unit increases power to 100 percent
of the total power requirement.
Catalyst 4900M Half-Card Modules
The Catalyst 4900M switch chassis has two half-card slots available allowing two half-card modules to
be installed. The following half-card modules are available:
• WS-X4920-GB-RJ45 Half-Card Ethernet Module, page 1-9
• WS-X4904-10GE Half-Card Ethernet Module, page 1-10
• WS-X4908-10GE Half-Card Ethernet Module, page 1-11
• WS-X4908-10G-RJ45 Half-Card Ethernet Module, page 1-13
The half-card modules can be mixed in a chassis.

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