Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Cisco 3850 Power Stack


We recently purchased four Cisco 3850 switches (WS-C3850-48P-S) which comes with 715WAC power supply. We have also purchased additional four 1100WAC power supplies.

Our requirements are:

  1. Configure four switches in stack
  2. Use power stack feature
  3. All 192 ports in Stack should be POE enabled



  1. Can we use both 715WAC and 1100WAC power supplies in same switch
  2. Can we have all ports POE enabled with having both 715WAC and 1100WAC power supplie



Muhammad Ibrahim


Hi,See this information below


See this information below:


24-Port PoE Switch

48-Port PoE Switch

PoE on all ports (15.4W per port)

One PWR-C1-715WAC

One PWR-C1-1100WAC or two PWR-C1-715WAC

PoE+ on all ports (30W per port)

One PWR-C1-1100WAC or two PWR-C1-715WAC

Two PWR-C1-1100WAC or one PWR-C1-1100WAC and one PWR-C1-715WAC


Hope this helps.

Cisco Employee

Hello Muhammad,You have a few

Hello Muhammad,

You have a few options for stack power configuration.  The switch has two power supplies per system, allowing the power load to be split between them. This accommodates the increased maximum power of 30 watts per port provided to a powered device to meet the PoE+ standard (802.3at). With PoE+, a 48-port system would need 1440 Watts to provide 30 Watts per powered device for the PoE ports. Systems with fewer powered devices might require only one power supply. In this case, the additional power supply can provide one-to-one redundancy for the active supply.

In addition, the stacking switch supports StackPower, which allows the power supplies to share the load across multiple systems in a stack. By connecting the switches with power stack cables, you can manage the power supplies of up to four stack members as a one large power supply that provides power to all switches and to the powered devices connected to switch ports. Since power supplies are most effective when running at 30 to 90% of their maximum load, taking some of the power supplies offline provides maximum power efficiency. Switches in a power stack must be members of the same switch (data) stack.






CreatePlease login to create content