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WS-X4148-RJ21
Catalyst 4500 32-10/100 (RJ-45),2-GE(GBIC) Linecard
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WS-X4148-RJ21 is an Ethernet module engineered for high-density network deployments, featuring 48 RJ-45 ports that deliver reliable 10/100 Mbps connectivity. Built for integration into Cisco modular switching systems, this module is designed to enhance network capacity while maintaining robust and efficient data transmission in enterprise environments.
This modular card is fully compatible with Cisco Catalyst platforms and supports TCP/IP protocol along with industry-standard auto-negotiation, jumbo frames, and QoS features. Its plug-and-play form factor and streamlined installation make it an ideal solution for upgrading server network interfaces, expanding data center capacity, and connecting to high-speed networks in a variety of commercial and industrial settings.
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| WS-X4148-RJ21 |  WS-X45-SUP6L-E |  WS-X4148-RJ |  WS-X4248-FE-SFP |  C4KX-FAN-R= | |
|---|---|---|---|---|---|
| Product Type | Network Module / Network Card | Network Module | Network Module / Network Card | Network Module / Network Card | Network Module / Network Card |
| Module Type | Ethernet Module | Ethernet Module | Ethernet | Ethernet | Ethernet |
| Data Rate | 10/100Mbps | 10Gbps | 1Gbps | 10/100 Mbps | 10Gbps |
| Connector Type | RJ-45 | SFP+ | RJ-45 | SFP | SFP+ |
| Supported Protocols | TCP/IP | TCP/IP, iSCSI | TCP/IP | TCP/IP | TCP/IP, iSCSI |
| Form Factor | Modular | PCIe | Modular | Modular | PCIe |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0°C to 40°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40°C to 70°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | N/A | 3.3V |
| Compatibility | Cisco | Cisco, Juniper, Arista, Dell, HP | Cisco | Cisco Catalyst Switches | Cisco, Juniper, Arista, Dell, HP |
| Max Speed | 100Mbps | 10Gbps | 1Gbps | 100Mbps | 10Gbps |
| Supported Features | Auto-negotiation, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, QoS, Jumbo Frames | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS |
| Power Consumption | N/A | 15W | 15W | N/A | 12W |
| Interface Ports | Ethernet | Ethernet | Ethernet | SFP | Ethernet |
| Expansion Slots | N/A | SFP+ | N/A | N/A | N/A |
| Product Name | WS-X4148-RJ21 | WS-X45-SUP6L-E | WS-X4148-RJ | WS-X4248-FE-SFP | C4KX-FAN-R= |
| Height | N/A | 0.3 inches | N/A | N/A | N/A |
| Width | N/A | 4.4 inches | N/A | N/A | N/A |
| Depth | N/A | 1.7 inches | N/A | N/A | N/A |
| Weight | N/A | 1.2 lbs | N/A | N/A | N/A |
The WS-X4148-RJ21 line card offers exceptional performance. It provides stable, high-speed connectivity and works flawlessly even with high traffic.
This line card is perfect for our office. The WS-X4148-RJ21 ensures smooth communication and fast connections across our entire network.
The WS-X4148-RJ21 delivers fast and reliable performance. It integrates seamlessly with our infrastructure and handles multiple connections effortlessly.
The WS-X4148-RJ21 is reliable and provides consistent performance. It ensures uninterrupted connectivity and stable communication for our business.
The WS-X4148-RJ21 is a solid choice. It provides fast, reliable connectivity and handles high-demand traffic with ease.
The WS-X4148-RJ21 is a Catalyst 4500 series line card offering 32 10/100 RJ-45 ports and 2 GE uplink slots for enhanced enterprise switching.
This line card delivers 32 Ethernet 10/100 RJ-45 ports and two Gigabit Ethernet GBIC uplink ports.
The WS-X4148-RJ21 is compatible with Supervisor Engine II, II+, III, III+, and IV modules in Catalyst 4500 chassis.
It supports Cisco IOS Software versions 12.2(18)E, 12.2(18)SXF, 15.0, and later 4500 platforms releases.
Power off the Catalyst 4500 chassis, slide the line card into the desired slot, secure the captive screws, then power on for automatic detection.
Yes, the WS-X4148-RJ21 supports hot-swap when used with a redundant Supervisor Engine IV and appropriate power redundancy.
It delivers up to 16 Gbps of Layer 2/3 switching capacity per card.
Yes, it supports full IEEE 802.1Q VLAN tagging, 802.1p QoS, ACLs, and advanced traffic prioritization.
Paired with a redundant Supervisor Engine and power supplies, the card enables high availability with nonstop forwarding and stateful switchover.
It draws approximately 75 W maximum; ensure chassis power modules can deliver at least 200 W per card for full redundancy.
Operate at 0 °C to 40 °C, 10%–85% relative humidity, non-condensing, with chassis cooling as per Catalyst 4500 guidelines.
Use the “show module” and “show interfaces status” IOS commands to confirm module status and port operational state.
Cisco provides a limited lifetime hardware warranty for end users plus Access to the Cisco Technical Assistance Center (TAC).
The WS-X4148-RJ21 is in extended support; check Cisco’s EOL announcement for replacement options like the 4500X series line cards.
While Catalyst 4500 doesn’t support VSS, it supports campus stacking via Cisco FlexStack modules on compatible chassis.
Consider Cisco Catalyst 4500X WS-C4506-E with 48-port gigabit line cards or Catalyst 4900M series for higher density and performance.
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