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Cisco UPOE & Samsung NC220P Zero Client - Maximum Powered Devices

Hi,

I have a question on the practical maximum number of Samsung NC220P Zero Clients that can be powered by Cisco 48-port UPOE Line cards in a Cisco 4500-E series switch.

According to Cisco datasheets:

  1. One 48-port UPOE line card can support only upto 1440W of UPOE power i.e. 24 ports on full 60W UPOE (http://www.cisco.com/en/US/prod/collateral/modules/ps2710/ps5494/product_data_sheet0900aecd802109ea_ps4324_Products_Data_Sheet.html)
  2. Using the 6000W Power Supplies, a single chassis of 4500-E series switch can support ONLY upto 74 devices that use 60W UPOE (http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps4324/product_data_sheet09186a00801f3dd9.html)
  3. The Samsung NC220P Zero Client uses 51W at startup and about 40W during normal operation

Based on the information above, if I have a 4506-E with a 48-port UPOE line card:

  • On one line card, I can power up to twenty four (24) 60W UPOE zero clients simulteneously. However, during normal operation, can I connect and power on a further eight (8) zero clients? - Based on the following thinking:
    • 1440W UPOE power per 48-port line card
    • Normal operation power for 24 zero clients = 24*40W = 960W
    • Remaining power in 48-port line card = 1440W - 960W = 480W
    • Number of 60W zero clients that can be powered on by 480W = 480W/60 = 8
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