2-10
Catalyst 4500 E-Series Switches Installation Guide
OL-13972-01
Chapter 2 Preparing for Installation
Ventilation
• 10 X 6.3 W = 63 W for inline devices.
6.3 Watts is correct for a Cisco IP phone. Wattage consumption will depend on the inline device used.
Step 4 Find the DC input power using the DC output power.
• 63/.96 (efficiency) = 65 W of DC input power.
Step 5 Divide the DC input power by the DC voltage input of –48 V to find the DC input current used by inline
devices.
• 65/48 = 1.4 Amps for inline devices.
Step 6 Add the DC input current used by data and the DC input current used by inline devices to find the total
DC input current.
• Total DC input current = 6.14 + 1.4 = 7.54 A.
Ventilation
Planning a proper location for the switch and the layout of your equipment rack or wirin g closet is
essential for successful system operation. You should install the switch in an enclosed, secure area,
ensuring that only qualified personnel have access to the switch and control of the environment.
Equipment placed too close together or inadequately ventilated can cause syst em overtemperature
conditions. In addition, poor equipment placement can make chassis panels inaccessible and difficult to
maintain.
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-conditioned 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 the site maintains an ambient
temperature of 0 to 40ºC (32 to 104ºF). It is essential to keep the area around the chassis as free from
dust and foreign conductive material (such as metal flakes from nea rby 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 equipmen t does not blow into the intake vent of the
chassis.
Cooling air is drawn in through the right side of the chassis. Keep the right side 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 clean power at your site. The environmental ranges listed in Appendix A,
“Specifications,” 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.