WS-X4248-RJ21V Cisco Catalyst 4500 PoE 802.3af 10/100 48-Ports Switch

WS-X4248-RJ21V Overview

The Cisco WS-X4248-RJ21V is a high-density access module for the Catalyst 4500 Series chassis, offering 48 ports of 10/100 Mbps Fast Ethernet with support for IEEE 802.3af Power over Ethernet (PoE). Unlike traditional RJ-45 port layouts, this module uses four RJ-21 connectors, each carrying multiple ports through a compact Telco-style interface, which simplifies large-scale cabling in enterprise wiring closets. By supporting PoE, the can power devices such as Cisco IP phones, wireless access points, and other networked equipment directly over the Ethernet connection, reducing the need for separate power infrastructure. It integrates tightly with Catalyst 4500 Supervisor Engines, benefiting from centralized intelligence, robust QoS features for prioritizing voice and video traffic, and modular scalability to support growing networks.