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Name:
WS-X4248-RJ21V
- Description:
- Catalyst 4500 48-Port 1000Base-X (SFPs Optional) Base-X GE Linecard
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3 Year Extended Warranty
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Once an RMA is approved, return the defective unit within 10 days. We handle the rest — no service gaps.
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WS-X4248-RJ21V Overview
WS-X4248-RJ21V is an advanced Ethernet module designed for high-performance networking environments. Built with robust reliability in mind, this unit features an RJ21 connector that enables consistent 1Gbps data rates, making it an excellent choice for mission-critical applications where seamless connectivity is paramount.
Engineered for effortless integration with industry-standard routers and switches, WS-X4248-RJ21V supports TCP/IP protocols and offers a modular form factor that simplifies installation and expansion. Ideal for upgrading server network interfaces and expanding data center capacity, this module delivers essential features like auto-negotiation, jumbo frames, and QoS to optimize network performance.
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Explore more options from Network Modules And Cards or explore other Cisco products.
WS-X4248-RJ21V Specifications
| Product Type | Network Module |
| Module Type | Ethernet |
| Data Rate | 1Gbps |
| Connector Type | RJ21 |
| Supported Protocols | TCP/IP |
| Form Factor | Modular |
| Operating Temperature | 0 to 70°C |
| Storage Temperature | -40 to 85°C |
| Input Voltage | 3.3V |
| Compatibility | Cisco |
| Max Speed | 1Gbps |
| Supported Features | Auto-negotiation, Jumbo Frames, QoS |
| Power Consumption | 15W |
| Interface Ports | Ethernet |
| Expansion Slots | N/A |
| Product Name | WS-X4248-RJ21V |
| Height | N/A |
| Width | N/A |
| Depth | N/A |
| Weight | N/A |
WS-X4248-RJ21V Use Case
Data Center Server Farm Aggregation with WS-X4248-RJ21V Catalyst 4500
In a high-density data center, the WS-X4248-RJ21V Catalyst 4500 48-Port 1000Base-X linecard aggregates 48 server uplinks into a single Gigabit Ethernet backbone. This deployment delivers up to 48 Gbps of non-blocking throughput, reduces switch-to-switch hops, and ensures low-latency packet forwarding. Benefit: Simplified network topology, predictable performance under peak loads, and streamlined management for large-scale server clusters.
Campus Building Edge Connectivity Using WS-X4248-RJ21V Catalyst 4500
For a multi-building university campus, the WS-X4248-RJ21V Catalyst 4500 Base-X linecard provides fiber-ready SFP ports to connect 48 high-bandwidth edge switches to the core. This solution supports long-reach multimode or single-mode links and delivers 1 Gbps per port with modular SFP flexibility. Benefit: Future-proofed bandwidth scalability, resilient ring or mesh topologies, and centralized QoS enforcement for voice, video, and data services.
Virtualization and Cloud Workload Segmentation on Catalyst 4500
In a private cloud environment hosting multi-tenant VMs, the WS-X4248-RJ21V linecard enables dedicated 1 Gbps links for each hypervisor, integrated with Catalyst 4500 policy-based VLANs and TrustSec. This setup isolates tenant traffic while maintaining line-rate forwarding across 48 VM hosts. Benefit: Enhanced security through micro-segmentation, guaranteed bandwidth for critical virtual workloads, and simplified compliance monitoring.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
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|---|---|---|---|---|---|
| Compatibility | Cisco Catalyst 4500 Series | Cisco Catalyst 4500-E Series | Cisco, Juniper, Arista, Dell, HP | Cisco / Juniper / Arista / Dell / HP | Cisco |
| Connector Type | N/A | SFP | SFP+ | SFP+ | RJ21 |
| Data Rate | 10Gbps | 1Gbps | 10Gbps | 10Gbps | 1Gbps |
| Depth | N/A | N/A | 1.7 inches | 7.0 inches | N/A |
| Expansion Slots | N/A | N/A | SFP+ | N/A | N/A |
| Form Factor | Modular | Modular | PCIe | PCIe | Modular |
| Height | N/A | N/A | 0.3 inches | 1.5 inches | N/A |
| Input Voltage | N/A | N/A | 3.3V | 3.3V | 3.3V |
| Interface Ports | N/A | SFP | Ethernet | Ethernet / SFP+ | Ethernet |
| Max Speed | 10Gbps | 1Gbps | 10Gbps | 10Gbps | 1Gbps |
| Module Type | N/A | SFP | Ethernet Module | Ethernet | Ethernet |
| Operating Temperature | 0 to 70°C | 0 to 55°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | N/A | N/A | 15W | 15W | 15W |
| Product Name | WS-X4606-X2-E Enhanced Supervisor Engine | Cisco WS-X4624-SFP-E Ethernet Services Module | WS-X45-SUP6L-E | WS-X4013+TS | WS-X4248-RJ21V |
| Product Type | Supervisor Engine | Network Module / Network Card | Network Module | Network Card | Network Module |
| Storage Temperature | -40 to 85°C | -40 to 70°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Supported Features | Routing, Switching, QoS, High Availability | Auto-negotiation, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation / Wake-on-LAN / Jumbo Frames / QoS | Auto-negotiation, Jumbo Frames, QoS |
| Supported Protocols | TCP/IP | TCP/IP | TCP/IP, iSCSI | TCP/IP / iSCSI | TCP/IP |
| Weight | N/A | N/A | 1.2 lbs | 1.2 lbs | N/A |
| Width | N/A | N/A | 4.4 inches | 3.5 inches | N/A |
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Questions & Answers
Q
What is the Cisco WS-X4248-RJ21V Catalyst 4500 line card?
A
The WS-X4248-RJ21V is a 48-port 1000Base-X Gigabit Ethernet line card for Cisco Catalyst 4500 chassis, supporting optional SFP transceivers for fiber connectivity.
Q
How many ports does the WS-X4248-RJ21V provide?
A
This line card delivers 48 independent Gigabit Ethernet ports over Base-X SFP interfaces.
Q
Which SFP modules are supported on the WS-X4248-RJ21V?
A
It supports Cisco SFP modules such as GLC-SX-MMD, GLC-LX-MMD, GLC-ZX-SM, and other Cisco-approved 1000Base-X transceivers.
Q
Which Catalyst 4500 supervisors are compatible with this line card?
A
Compatibility requires Supervisor Engine 6-E, 7-E, or later with required Cisco IOS software and appropriate feature licenses.
Q
What is the forwarding throughput of the WS-X4248-RJ21V?
A
It delivers up to 48 Gbps of line-rate throughput, forwarding packets at full wire speed on all ports simultaneously.
Q
Does the WS-X4248-RJ21V support Layer 3 routing?
A
Yes, when paired with a Layer 3-capable supervisor engine and proper IOS feature license, it supports OSPF, EIGRP, BGP, and static routing.
Q
Can I install or remove the WS-X4248-RJ21V while the chassis is powered?
A
Yes, the module is hot-swappable, allowing installation or removal without powering down the Catalyst 4500 chassis.
Q
What power consumption should I plan for?
A
Typical power draw is 65 W, with a maximum of 80 W under full load, as documented in Cisco’s line card specifications.
Q
Which Cisco IOS features are supported on this line card?
A
It supports QoS, ACLs, VLANs, Jumbo Frames, IGMP snooping, and advanced security features under the supervisor’s IOS image.
Q
Does the WS-X4248-RJ21V support redundancy and high availability?
A
Yes, it supports Stateful Switchover (SSO) and Nonstop Forwarding (NSF) when paired with a redundant supervisor engine.
Q
How do I install the WS-X4248-RJ21V in my Catalyst 4500 chassis?
A
Power on the chassis, slide the module into an available line-card slot until it latches, then enable ports via the supervisor’s CLI or web interface.
Q
What maintenance does this line card require?
A
Perform periodic firmware updates on the supervisor engine, clean module air fans, and ensure proper temperature and dust-free environment.
Q
Can I mix WS-X4248-RJ21V with other line cards in one chassis?
A
Yes, you can combine it with other Catalyst 4500 line cards, subject to slot numbering, supervisor capacity, and power-budget constraints.
Q
What are common use cases for the WS-X4248-RJ21V?
A
Ideal for enterprise aggregation, data center access, and campus distribution requiring high-density fiber connectivity at Gigabit speeds.
Q
What is the end-of-life status of the WS-X4248-RJ21V?
A
Cisco has designated it as EOS (End of Sale) with limited support; the recommended migration path is to the Catalyst 4500E series with newer line cards.
Q
How do I upgrade software on the WS-X4248-RJ21V?
A
Software upgrades occur on the supervisor engine via TFTP/FTP or USB; the line card inherits the supervisor’s IOS image automatically.
