Cisco Systems XR 12406 manual Blower Module, Power Distribution

Chapter 1 Cisco XR 12406 Router Overview

Line Cards

Power Distribution

The router chassis backplane distributes -48 VDC power throughout the router and to all cards in the card cages.

All cards have multiple DC-DC converters that convert the -48 VDC into

+2.5 VDC, +3.3 VDC, +5 VDC, and other voltages as required by the line card. The DC-DC converters are turned on by the MBus modules under the control of the route processor and MBus software.

Power for the blower module is supplied directly from the backplane through a connector in the PDU that passes DC voltage from the backplane to the blower module. An blower module controller card in the blower module converts –48 VDC into DC voltage that powers the blower module fans.

Caution To ensure that the chassis configuration complies with the required power budgets, use the on-line power calculator. Failure to properly verify the configuration may result in an unpredictable state if one of the power units fails. Contact your local sales representative for assistance.

Blower Module

The Cisco XR 12406 Router is equipped with a blower module to distribute air within the chassis. The blower module is located on the rear of the chassis (see Figure 1-2). The blower module draws room air into the chassis through two air filters on the side of the chassis, pulls the air through the chassis card cages, and expels it through exhaust vents on the back of the blower module (Figure 1-10).

Caution Exhaust from other equipment vented directly into the router air inlet may cause overheating. The front, back, and sides of the router must remain unobstructed to ensure adequate air flow and prevent overheating inside the chassis. Allow sufficient air flow by maintaining 6 inches (15.24 cm) of clearance at both the inlet and exhaust openings on the chassis.

	Cisco XR 12406 Router Installation Guide
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