Cisco C3KX-NM-1G 4 Ports Module
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Cisco C3KX-NM-1G 4 Ports Network Module Gigabit Ethernet Refurbished

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Part Number#: C3KX-NM-1G
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Short Description:
C3KX-NM-1G 4 Ports 1 x 1000Base-X Gigabit Ethernet Network Module for Catalyst 3750-X, 3560-X Series Switches | Made by Cisco | Refurbished
Product Condition:
Warranty provided by ALLHDD.COM:
90 Days
Product Overview of the Cisco C3KX-NM-1G 4 Ports Network Module

The Cisco C3KX-NM-1G is a network module that can be installed in Cisco Catalyst 3750-X and 3560-X Series Switches. These switches are widely used in enterprise networks, data centers, and other networking environments due to their reliability, performance, and scalability. The C3KX-NM-1G module adds 4 Gigabit Ethernet ports to the switch, which can be used for various networking tasks such as connecting devices, creating VLANs, and expanding network capacity.


The Cisco C3KX-NM-1G is hot-swappable, meaning it can be inserted or removed without powering down the connected switch. This feature is essential for minimizing network downtime during installation or maintenance. With hot-swappability, network administrators can add or replace modules while the switch is still operational, reducing disruptions and ensuring network continuity.

Gigabit Ethernet Support

The most prominent feature of this network module is its support for Gigabit Ethernet. Each of the 4 ports is capable of handling 1 Gbps data transfer speeds, which is essential for high-speed data transmission in today's networks. Gigabit Ethernet is a standard for modern networks, enabling the efficient transfer of large data files and ensuring a seamless user experience.

Compatibility with SFP Modules

This network module is compatible with Small Form-Factor Pluggable (SFP) modules. SFP modules are interchangeable and can be easily swapped out to adapt to various networking needs. The Cisco C3KX-NM-1G's compatibility with SFP modules allows organizations to choose the appropriate transceivers and cables based on their specific requirements, whether it's fiber optics or copper connections.

LED Indicators

The Cisco C3KX-NM-1G features LED indicators for each of its ports. These indicators provide essential information about the status of the ports, such as link activity and speed. This visual feedback simplifies network troubleshooting and helps administrators quickly identify any issues with individual connections.

Energy-Efficient Design

In line with Cisco's commitment to sustainability and energy efficiency, the C3KX-NM-1G is designed to optimize power consumption. It is compliant with energy-efficient Ethernet standards, ensuring that it consumes power efficiently while maintaining network performance. This not only reduces operational costs but also contributes to environmental sustainability.

Increased Network Capacity

One of the primary advantages of the Cisco C3KX-NM-1G is the increased network capacity it provides. With four additional Gigabit Ethernet ports, organizations can connect more devices to the network without experiencing congestion or slowdowns in data transfer. This is especially valuable for businesses with expanding network requirements.

Flexibility in Network Design

The module's compatibility with SFP modules adds a layer of flexibility to network design. Organizations can choose the type of transceivers and cables that best suit their network topology, whether it's for short-range connections within a data center or long-distance connections between buildings.


In today's ever-evolving digital landscape, organizations often need to scale their networks quickly to accommodate more devices and data traffic. The Cisco C3KX-NM-1G's scalability allows organizations to adapt to changing network requirements without undergoing costly and disruptive network overhauls.

High-Speed Data Transfer

The demand for high-speed data transfer is on the rise, driven by the increasing use of data-intensive applications, cloud services, and multimedia content. The Gigabit Ethernet support offered by the network module ensures that data can be transferred rapidly and without bottlenecks.


The compatibility with SFP modules adds versatility to the network module, enabling organizations to tailor their network infrastructure to specific needs. Whether it's connecting over short distances or establishing long-haul connections, the Cisco C3KX-NM-1G can accommodate a wide range of scenarios.


Cisco is a well-established and trusted brand in the networking industry, known for the reliability of its products. The Cisco C3KX-NM-1G maintains this reputation by offering a dependable solution for organizations looking to expand their network capabilities.

Cost-Effective Expansion

Expanding a network often involves significant costs, including the purchase of new switches and infrastructure. The Cisco C3KX-NM-1G provides a cost-effective alternative by allowing organizations to expand their network capacity without investing in entirely new hardware.

Catalyst 3750-X Series Switches

The Cisco Catalyst 3750-X Series is a family of switches designed for enterprise-class networks. These switches offer advanced features and capabilities to meet the demands of modern businesses. The Cisco C3KX-NM-1G extends the functionality of these switches by providing additional Gigabit Ethernet ports.

Catalyst 3560-X Series Switches

The Catalyst 3560-X Series is another set of switches targeted at enterprise networks. These switches are known for their scalability and performance. The Cisco C3KX-NM-1G is fully compatible with this series, allowing businesses to increase network capacity and improve connectivity.

By ensuring compatibility with these two popular series of switches, Cisco provides its customers with a versatile and cost-effective solution to enhance their network infrastructure.

Features and Benefits

The C3KX-NM-1G Cisco 4 Ports Gigabit Ethernet Network Module is an expansion module that can be installed in a Cisco Catalyst 3750-X or 3560-X switch to increase its network connectivity capabilities. Here are some of the key features and benefits of this module:

  • Four Gigabit Ethernet ports: The module provides four high-speed Gigabit Ethernet ports, each with a data transfer rate of up to 1 Gbps.
  • Hot-swappable: The module is hot-swappable, which means it can be installed or removed from the switch without shutting down the system or disrupting network connectivity.
  • Compatibility: The module is compatible with both copper and fiber-optic cabling.
  • Auto-negotiation: The module supports auto-negotiation, which means it can automatically detect the speed and duplex mode of connected devices.
  • Jumbo frames support: The module supports jumbo frames up to 9216 bytes.
  • Increased network connectivity: With four additional Gigabit Ethernet ports, the module expands the network connectivity capabilities of the switch.
  • Flexibility: The module is compatible with both copper and fiber-optic cabling, providing flexibility in network design and allowing for longer-distance connections.
  • Hot-swappable: The hot-swappable feature of the module makes it easy to install or remove the module without causing network downtime.
  • Auto-negotiation: The auto-negotiation feature allows the module to automatically detect the speed and duplex mode of connected devices, simplifying network configuration and reducing errors.
  • Jumbo frames support: The jumbo frames support feature allows for larger packet sizes, which can improve network performance in certain applications such as video streaming or large file transfers.
Network Management and Security

The C3KX-NM-1G Cisco 4 Ports Gigabit Ethernet Network Module can be managed and secured through a variety of methods. Here are some network management and security considerations for this module:

  • Network Management: The module can be managed through various network management protocols, such as Simple Network Management Protocol (SNMP), Command Line Interface (CLI), and Simple Network Management Protocol version 3 (SNMPv3). These protocols allow administrators to monitor the status of the module, configure settings, and diagnose any issues that may arise.
  • Access Control: Access control mechanisms should be implemented to ensure that only authorized personnel can manage the network module. This can be achieved by using features such as Access Control Lists (ACLs) and authentication protocols such as RADIUS and TACACS+.
  • Firmware updates: Regular firmware updates should be performed to keep the module up-to-date with the latest security patches and bug fixes. These updates can be done through various methods, including CLI, SNMP, or using Cisco's firmware management tools.
  • Port Security: The module supports port security features such as MAC address limiting, which limits the number of MAC addresses that can be learned on a port. This helps prevent unauthorized devices from connecting to the network.
  • VLANs: Virtual Local Area Networks (VLANs) can be implemented to segment the network and improve security. This can be achieved by assigning each port on the module to a different VLAN, which can prevent unauthorized access to sensitive network resources.
  • Network Monitoring: Network monitoring tools can be used to detect any suspicious activity on the network, such as unauthorized access attempts or abnormal traffic patterns. This can help administrators detect and respond to security threats in a timely manner.
General Information about this Cisco C3KX-NM-1G
  • Manufacturer: Cisco
  • Part Number or SKU# C3KX-NM-1G
  • Product Type: Network Module
Technical Information of Network Module
  • Application/Usage: Data Networking
Interfaces/Ports of 4 Ports Module
  • Total Number of Ports: 4
  • Interfaces/Ports: 1 x 1000Base-X
  • Interfaces/Ports Details: 1 x 1000Base-X Network
Media & Performance
  • Ethernet Technology: Gigabit Ethernet
  • Network Technology: 1000Base-X
  • Connectivity Technology: Wired
  • Data Link Protocol: Gigabit Ethernet
  • Status Indicators: Link/activity
Expansion / Connectivity
  • Expansion Slots: 4 (total) / 4 (free) x SFP
  • Compatible Slots: 1 x expansion slot
Environmental Parameters
  • Operating temperature: -5 to 45°C up to 5000ft elevation, -5 to 40°C up to 10000ft elevation
  • Storage temperature: -40 to 70°C
  • Relative humidity operating, noncondensing: 5 to 95% non-condensing
  • Relative humidity non-operating, noncondensing: 5 to 95% non-condensing
  • Operating altitude: 10,000 ft. (3000m)
  • Storage altitude: 15,000 ft. (4750
Compatibility Information
  • Cisco Catalyst 3560X-24P/L/S and 3560X-48P/L/S: These are 24- and 48-port switches with PoE (Power over Ethernet) capability, which allows them to power connected devices such as IP phones and wireless access points.
  • Cisco Catalyst 3560X-24T/L/S and 3560X-48T/L/S: These are 24- and 48-port switches with RJ-45 connectors for connecting devices via Ethernet cables.
  • Cisco Catalyst 3750X-12S/E/S: This is a 12-port switch with SFP (Small Form-Factor Pluggable) uplinks, which can be used to connect to other network devices or to fiber optic cabling.
  • Cisco Catalyst 3750X-24P/L/S and 3750X-48P/L/S: These are 24- and 48-port switches with PoE capability.
  • Cisco Catalyst 3750X-24S/E/S and 3750X-48S/E/S: These are 24- and 48-port switches with SFP+ uplinks, which provide higher bandwidth than SFP uplinks.
  • Cisco Catalyst 3750X-24T/L/S and 3750X-48T/L/S: These are 24- and 48-port switches with RJ-45 connectors.
  • Cisco Catalyst 3750X-48PF/L/S and 3750X-48P/L/S: These are 48-port switches with PoE capability, but the "PF" version provides higher power output for devices that require more power.

In summary, the Cisco C3KX-NM-1G network module is a valuable addition to Cisco Catalyst 3750-X and 3560-X series switches, offering enhanced connectivity and high-speed data transfer capabilities. This module has a wide range of practical applications across various industries and network environments, making it a versatile solution for network expansion and optimization.

When considering the installation of a network module, it's crucial to follow best practices to ensure a secure and efficient installation process. Properly installed network modules contribute to network reliability, scalability, and overall network performance.

As businesses and organizations continue to rely on robust and efficient network infrastructure, network modules like the Cisco C3KX-NM-1G play a vital role in meeting the growing demands of modern networking.

Product Condition:
Warranty provided by ALLHDD.COM:
90 Days

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Refurbished products are typically refurbished by an Original Manufacturer or an affiliate of the manufacturer or 3rd party facility. This product may have minor blemishes due to normal product usage and doesn't necessarily come with documentation and software unless indicated, but has been well tested and generally has never had any defects.

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