Cisco C3KX-NM-10GT Network Module – Specs & Use Cases
In today’s enterprise and data center environments, network demands are growing rapidly. Upgrading uplink capacity is often more cost-effective than replacing entire switches. The Cisco C3KX-NM-10GT module is one such solution. It offers 10 Gigabit Ethernet copper (RJ-45) uplinks for Cisco Catalyst 3560-X and 3750-X series switches. This article explains what the C3KX-NM-10GT is, its specifications, compatibility, and real-world usage tips.
What is the C3KX-NM-10GT Module?
The Cisco C3KX-NM-10GT is a network expansion module designed for Catalyst 3560-X and 3750-X switches. It provides two copper RJ-45 ports, each capable of operating at 1Gbps or 10Gbps. This module is ideal for organizations looking to improve uplink bandwidth without the expense of replacing entire switches.
Key Specifications and Features
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Ports: 2 × RJ-45 copper ports
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Speeds: Supports both 1Gbps and 10Gbps (autonegotiates)
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Compatible Switches: Cisco Catalyst 3560-X and 3750-X models
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MTBF (Mean Time Between Failures): Approximately 1.4 million hours
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Form Factor: Plug-in expansion module, hot-swappable
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Cable/Connector: RJ-45 (10GBase-T)
Compatibility and Usage Scenarios
Compatible Models
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Cisco Catalyst 3560-X models (24-port and 48-port, PoE and non-PoE variants)
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Cisco Catalyst 3750-X models (12-port, 24-port, and 48-port options)
Best Use Cases
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Resolving uplink bottlenecks in distribution or core networks.
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Upgrading selectively from 1Gbps to 10Gbps without a complete switch refresh.
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Using existing copper cabling for 10Gbps instead of investing in fiber.
C3KX-NM-10GT: 2 copper RJ-45 ports, supports both 1Gbps and 10Gbps.
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C3KX-NM-10G: 4 fiber ports (SFP/SFP+). Two support only 1Gbps, while two support 1Gbps/10Gbps SFP+.
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C3KX-NM-1G: 4 fiber SFP ports, supports only 1Gbps, more affordable option.
Installation and Operational Tips
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Ensure the switch is running an IOS version that supports the module.
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Use Cat-6a or higher cabling for stable 10G performance up to 100m.
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Provide adequate cooling because copper 10G ports generate more heat.
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Verify your switch power supply can handle added power consumption.
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When hot-swapping, follow antistatic and handling guidelines.
Real-World Example Use Case
A university with multiple Cisco 3560-X switches struggled with uplink saturation during peak video streaming hours. Instead of replacing all switches, the IT team installed C3KX-NM-10GT modules to upgrade their uplinks to 10Gbps copper. This increased capacity improved network performance significantly and reduced costs compared to a full hardware replacement.
Authoritative References
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Cisco Catalyst 3750-X & 3560-X Hardware Installation Guide (Cisco official site)
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Router-Switch C3KX-NM-10GT datasheet
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NetworkTigers product overview
Frequently Asked Questions
Q1: Does the C3KX-NM-10GT support both 1Gbps and 10Gbps speeds?
A1: Yes, it supports both speeds through autonegotiation.
Q2: Which Catalyst switches are compatible?
A2: It is compatible with Cisco Catalyst 3560-X and 3750-X models.
Q3: What cable types work best with this module?
A3: Cat-6a or Cat-7 cables support 10Gbps up to 100m. Cat-6 may work for shorter distances (around 55m).
Q4: Is the C3KX-NM-10GT a cost-effective upgrade?
A4: Yes. It is often more affordable than replacing switches or moving to fiber, especially if you already have copper cabling.
Q5: What are the limitations of copper 10G uplinks?
A5: Copper 10G links consume more power, generate more heat, and may have slightly higher latency than fiber.
Conclusion
The Cisco C3KX-NM-10GT is a reliable and cost-effective way to enhance uplink bandwidth on Catalyst 3560-X and 3750-X switches. With its dual 10G copper ports, backward compatibility to 1G, and hot-swappable design, it provides a flexible upgrade option. Organizations can extend the life of their existing switches while enjoying improved performance.
If your network relies on Cisco Catalyst 3560-X or 3750-X switches, investing in the C3KX-NM-10GT can help future-proof your infrastructure without unnecessary hardware replacement.
