Chapter 2 Preparing for Installation
Site Requirement Guidelines
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Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
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air is too warm, an overtemperature condition can occur within the router.
Under extreme conditions, the environmental monitoring system shuts down
the power to protect the router components.

Temperature and Humidity

The operating environmental site requirements are listed in Appendix A,
“Technical Specifications.” The temperature and humidity ranges listed are those
within which Cisco 12006 and Cisco 12406 Routers will continue to operate. You
can maintain normal operation by anticipating and correcting environmental
irregularities before they approach critical values.
The environmental monitoring functionality built into Cisco 12006 and
Cisco 12406 Routers protects the system and components from potential damage
from overvoltage and overtemperature conditions. To assure normal operation and
avoid maintenance difficulty, plan and prepare your site before you install the
router.
Rack-Mounting Guidelines
Before installing Cisco 12006 and Cisco 12406 Routers in a rack, consider the
general rack-mounting guidelines in the following sections.

Types of Equipment Racks

Cisco 12006 and Cisco 12406 Routers can be mounted in most two-post,
four-post, or telco-type 19-inch equipment racks that comply with the Electronics
Industries Association (EIA) standard for equipment racks (EIA-310-D). The rack
must have at least two posts with mounting flanges on which to mount the router
chassis. The distance between the center lines of the mounting holes on the two
mounting posts must be 18.31 inches ± 0.06 inch (46.50 cm ± 0.15 cm).