Name: Cisco Catalyst C3850 Series
Brand: Cisco
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Before connecting the switches in a power stack, keep in mind these guidelines:

• A switch power stack can include a maximum of four switches in a ring topology and nine switches in

a star topology.

• Size of the switch and any optional power supply module. The 1100-W power-supply module is 1.5

inches (3.81 cm) longer than the other modules, and with the attached cable retention clip, it extends 3

inches (7.62 cm) from the switch chassis. Stacking switches with the same power-supply modules together

makes it easier to cable the switches. For switch dimensions, see Appendix A, “Technical Specifications.”

• Length of cable. Depending on the configurations that you have, you might need different-sized cables.

If you do not specify the length of the StackPower cable, the 0.3 meter cable is supplied. If you need the

1.5 meter cable, you can order it from your Cisco supplier. For cable part numbers, see StackPower

Connector, on page 30. The StackPower Cabling Configurations, on page 41 provides examples of

recommended configurations.

• For rack-mounted switch stacks that are members of a data stack and a StackPower stack, see Switch

Stacking and Power Stacking Guidelines, on page 37

StackPower Cabling Configurations

This section describes the recommended cabling configurations for a StackPower stack. There are two types

of StackPower cables.

The cable in the figure connects a switch to another switch in a power stack or with an XPS. StackPower

cables have color bands on the cable ends:

• The cable end with the green band can connect only to a switch.

• The cable end with the yellow band can connect to a switch or an XPS.

The cable is available in two lengths.

LengthCable TypePart Number

0.3 meterStackPower CableCAB-SPWR-30CM

1.5 meterStackPower CableCAB-SPWR-150CM

Figure 24: StackPower Cable for Use with Cisco Catalyst 3850 Series Switches

This figure shows a ring configuration using both of the supplied 0.3-meter StackPower cables and one

1.5-meter cable. In the examples that follow, the switches are stacked in a vertical rack or on a table.

Catalyst 3850 Switch Hardware Installation Guide

41OL-26779-05

Switch Installation

StackPower Cabling Configurations

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Cisco Catalyst C3850 Series Specifications

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