Specifications

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Catalyst 4224 Access Gateway Switch Software Configuration Guide

OL-2031-02

Chapter 1 Product Overview

IP Telephony

The term IP telephony identifies a networking solution that integrates a switched

LAN, the Cisco CallManager, and IP phones.

The Catalyst 4224 is designed to work as part of a centralized Cisco CallManager

network that supports up to 24 remote users. As part of an IP telephony solution,

the Catalyst 4224 provides:

• 24 ports of switched 10/100 Ethernet connectivity to PCs and servers on a

LAN

• Line-powered Ethernet for Cisco IP phones

• Limited backup capability when Cisco CallManager is unavailable

Note The Catalyst 4224 has digital signal processors (DSPs) installed on the

motherboard but does not support a DSP farm. Transcoding and conferencing

services are supplied to the branch office by a central Cisco CallManager.

Ethernet Switching

Using the auxiliary VLAN feature, you can segment phones into separate logical

networks even though the data and voice infrastructure are physically the same.

The auxiliary VLAN feature places the phones into their own VLANs without the

need for end-user intervention. You can plug the phone into the switch, and the

switch provides the phone with the necessary VLAN information.

Key Ethernet switch features include:

• Hardware-based Layer 2 switching

• Software-based Layer 3 switching

• Twenty-four 10BASE-T/100BASE-TX auto-sensing ports, each delivering

up to 200 Mbps of bandwidth or 100 Mbps of full-duplex bandwidth

• Forwarding and filtering at full wire speed on each port

• Port security that restricts a port to a user-defined group of stations

• Support for up to 8000 unicast and more than 242 multicast addresses