Cisco Cisco VN 2900 Network Adaptation Interface Guía De Instalación

Cisco 10/100BASE-T Ethernet switch HWICs can be inserted into HWIC slots only. They are not 
designed to fit into WIC/VIC slots.

The Cisco 10/100BASE-T Ethernet switch HWIC provides Layer 2 switching for traffic between one 
port on the HWIC and any other port on the same HWIC. The HWIC also supports Layer 3 traffic to and 
from the HWIC and any of the other platform interfaces. Traffic between different VLANs on the switch 
is routed through the router platform.

Two Cisco 10/100BASE-T Ethernet switch HWICs can be stacked in a router chassis to provide 
expanded switching capability. See the 

 for a detailed description.

Each version of the Cisco 10/100BASE-T Ethernet switch HWIC is capable of providing –48 volts of 
inline power through its ports. Inline power is used to provide power to an IP phone or to a wireless 
access point attached to a port. 

The HWIC-D-9ESW card provides inline power through only eight of its ports, ports 0 through 7. The 
ninth port (port 8) is intended to be a stacking port, and as such, does not support inline power.

To provide inline power, an HWIC must be provisioned with an optional daughter card that distributes 
inline power. Inline power is provided by a –48 volt power supply within the router. The daughter card 
distributes the –48 volt power to the ports of the HWIC.

In order for the HWIC to distribute inline power, the router must be provisioned with an optional –48 
volt power supply.

The Cisco 10/100BASE-T Ethernet switch HWIC uses two LEDs per port to indicate link status and 
inline power status. See 

, 

 for a description of these LEDs.

Product name

Port number

Inline power LED

Link LED

95786

HWIC
4ESW

PWR 3x LNK

PWR 2x LNK

PWR 1x LNK

PWR 0x LNK