• Systems compared (information available on vendor’s web sites)
• –6850-48 vs Cisco 3750G-48TS, 121 vs 146 Watts
• –6850-48x vs Cisco 3750E-48TD, 146 vs 265 Watts
• –6248 vs HP 2650, 65 vs 100 Watts
• –OmniSwitch 9800 vs Cisco 6513, 913 vs 4231 Watts
• –OmniSwitch 9700 vs Cisco 6506, 560 vs 2243 Watts
• –IP Touch 4068 EE vs Cisco 7961G-GE, 5.56 vs 7.81 Watts
• Rule of thumb
• –One Watt Power dissipation difference in a device over leads to:
• –Western Europe
• 1 Watt ~ 0.84 Euro per year cost (over five years)
• –North America
• 1 Watt ~ 1.07 US Dollar per year cost (over five years)
• Power vs Energy
• –Power is actual dissipation expressed in miliWatts, Watts, kiloWatts, MegaWatts
• –Energy is power dissipation during a time period: Watthour, kiloWatthor, MWh
• –A device dissipating constantly 100 Watts, over 1 year uses:
• 365 days x 24 hours x 100 W = 876,000 Wh = 876 kWh Energy
• Rule of thumb it costs 84 Euro/107 US Dollar a year