Chapter 2 Site Planning
Site Power Requirements
2-2
Cisco Catalyst 4900M Switch Installation Guide
78-18350-01
The switch operates as a standalone system mounted in a rack in a secure wiring
closet. It requires a dry, clean, well-ventilated, and air-condit ioned environment.
To ensure normal operation, maintain ambient airflow. If the airflow is blocked or
restricted, or if the intake air is too warm, an overtemperature condition can occur.
The switch environmental monitor can then shut down the system to protect the
system components.
To ensure normal operation and avoid unnecessary maintenance, plan your site
configuration and prepare your site before installation. After installation, make
sure that the site maintains an ambient temperature of 0 to 40°C (32 to 104°F). It
is essential to keep the area around the chassis as free from dust and foreign
conductive material (such as metal flakes from nearby construction activity) as is
possible.
Multiple switches can be rack-mounted with little or no clearance above and
below the chassis. However, when mounting a switch in a rack with other
equipment, or when placing it on the floor near other equipment, ensure that the
exhaust from other equipment does not blow into the intake vents of the chassis.
Cooling air is drawn in through the right side and exhausted through the left side
of the chassis. Keep the sides and rear clear of obstructions, including dust and
foreign conductive material, and away from the exhaust ports of other equipment.
Appendix A, “Specifications,” lists the operating and nonoperating environmental
site requirements for the switches. To maintain normal operation and ensure high
system availability, maintain an ambient temperature and EMI-free and
continuous power at your site. The environmental ranges listed in Appendix A are
those within which the switch will continue to operate; however, a measurement
that approaches the minimum or maximum of a range in dicates a potential
problem. You can maintain normal operation by anticipating and correcting
environmental anomalies before they exceed the maximum operating range.
Site Power Requirements
This section describes the installation site power requirements for the
Catalyst 4900M switch. Verify your site power before you install the switch.
This section consists of the following sections:
• Preinstallation Requirements, page 2-3
• Warnings and Cautions, page 2-3