Cisco Systems manual Cisco 7500 Series Installation and Configuration Guide

Chapter 2 Preparing for Installation

Environmental Monitoring and Reporting Overview for the Cisco 7500 Series

•Maintain a minimum clearance of 6 inches (15.24 cm) on the rear and front of the chassis for the cooling air inlet and exhaust ports, respectively. Avoid placing the router in an overly congested rack or directly next to another equipment rack. Otherwise, the heated exhaust air from other equipment can enter the inlet air vents and cause an overtemperature condition inside the router.

•Install and use the cable management bracket included with the router to keep cables organized and out of the way of processor modules, power supplies, and the blower module. Consider the equipment and cabling that is already installed in the rack. Ensure that cables from other equipment will not impair access to the interface processors or require you to disconnect cables unnecessarily to perform equipment maintenance or upgrades.

•Always install heavier equipment in the lower half of a rack to maintain a low center of gravity to prevent the rack from falling over. If you install one Cisco 7513, Cisco 7513-MX, or Cisco 7576 in a rack, the chassis bottom should not be higher than 20 inches (50.8 cm) from the floor.

•If you use 2-post racks, be sure that the rack is bolted to the floor and secured. One end of the chassis mounts to the two rack posts with the chassis ears; the rest of the chassis is cantilevered off the posts. Ensure that the weight of the chassis does not make the rack unstable. Some 2-post racks are also secured to ceiling brackets if warranted by the weight of the equipment in the rack.

•To properly install the Cisco 7513, Cisco 7513-MX, or Cisco 7576 in a rack, use the instructions in the configuration note Cisco 7513 and Cisco 7576 Rack-Mount Kit Installation Instructions (Document Number 78-2023-xx, where xx indicates the latest document version), which accompanies the rack-mount kit. The rack-mount kit is the same for the Cisco 7507,

Cisco 7507-MX, Cisco 7513, Cisco 7513-MX, and Cisco 7576 (ACS-7000RMK=).

In addition to the preceding guidelines, we recommend you review the precautions for avoiding overtemperature conditions in the “General Equipment Rack Ventilation Considerations” section on page 2-15.

Environmental Monitoring and Reporting Overview for the Cisco 7500 Series

In the Cisco 7500 series routers, the environmental monitoring and reporting functions are controlled by the chassis interface (CI) board. These functions enable you to maintain normal system operation by identifying and resolving adverse conditions prior to loss of operation. The environmental monitoring functions constantly monitor the internal chassis air temperature and DC supply voltages and currents.

Each power supply monitors its own voltage and temperature and shuts itself down if it detects a critical condition within the power supply. If conditions reach shutdown thresholds, the system shuts down to avoid equipment damage from excessive heat. The reporting functions periodically log the values of measured parameters so that you can retrieve them for analysis later, and the reporting functions display warnings on the console if any of the monitored parameters exceed defined thresholds.

In addition to monitoring internal temperature and voltage levels, the system also monitors the fan tray or blower. If the fan tray or blower fails, the system displays a warning message on the console. If the blower is still not operating properly after 2 minutes, the system shuts down to protect the internal components against damage from excessive heat.

	Cisco 7500 Series Installation and Configuration Guide
2-22	OL-5008-03 B0