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METHOD AND APPARATUS TO SAVE FAN POWER CONSUMPTION FOR LARGE MODULAR SYSTEMS AND TO GAIN COOLING AIRFLOW FOR SMALLER SYSTEMS

IP.com Disclosure Number: IPCOM000246141D
Publication Date: 2016-May-11
Document File: 5 page(s) / 82K

Publishing Venue

The IP.com Prior Art Database

Related People

H-s Liang: AUTHOR [+4]

Abstract

Presented herein is a method and apparatus to reduce fan power consumption for the largest 18-slot next generation modular (Next Generation (NG)-modular-18) data center network switch system from 7200 W to 3000 W while enabling system compacting for smaller modular switch systems. An auxiliary chassis intake is provided that is built into the chassis structure.

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METHOD AND APPARATUS TO SAVE FAN POWER CONSUMPTION FOR LARGE MODULAR SYSTEMS AND TO GAIN COOLING AIRFLOW FOR SMALLER SYSTEMS

AUTHORS:

 H-s Liang Rakesh Chopra Mandy Lam

Onder Cap

CISCO SYSTEMS, INC.

ABSTRACT

    Presented herein is a method and apparatus to reduce fan power consumption for the largest 18-slot next generation modular (Next Generation (NG)-modular-18) data center network switch system from 7200 W to 3000 W while enabling system compacting for smaller modular switch systems. An auxiliary chassis intake is provided that is built into the chassis structure.

DETAILED DESCRIPTION

    NG-modular systems will have various system configurations from smaller (4-,6-, 9-slots) to a largest of 18 slots. In the smaller configurations, the system height is critical to market competition while in the larger system the system height requirement is relaxed.

    The NG-modular system is estimated to dissipate 2000 Watt of heat per line card (LC). This requires 175 CFM of airflow to remove the heat. Fans consuming 180 W each of power are used to deliver the required airflow. The table below shows the fan power consumption for various system configurations.

# of fans

used

Total Fan

Power

               Consumption
4 LC slot
8 1,440 Watt
9 LC slot 20 3,600 Watt 18 slot 40 7,200 Watt

Copyright 2016 Cisco Systems, Inc.

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    The fan power consumption for the 18 slot system reaches a forbiddingly high value at 7200 W. Fortunately, unlike the smaller system in which it is necessary to compact the system sizes in order to stay competitive in the matrix of port-density, in the largest system the chassis height requirement can be relaxed. Accordingly, presented herein is a method and apparatus of system airflow design which allow compacting for smaller systems while saving fan power consumption for larger systems.

     In the larger systems where the system height is less constrained, an auxiliary intake is built into the chassis structure. The below figures show schematics of the auxiliary chassis intake and the line card stack in a chassis.

Schematic of Line Card (side view)

Air intake

Line cards stack up in a Smaller Sys...