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by Cisco
Product Line: Cisco 3750-X Series
Product Type: Switch
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Product Description

The C3KX-NM-1G module offers a switching fabric capacity of 160 Gbps and supports up to 1005 VLANs with 4K VLAN IDs, ensuring efficient handling of network traffic and segmentation. It is equipped with DRAM of 256 MB (expanding to 512 MB for specific models) and Flash memory of 64 MB (increasing to 128 MB for certain models), facilitating smooth operation and storage of the system configuration. Designed for durability, it operates within a temperature range of -5 to 45°C at elevations up to 5000 ft, with a Mean Time Between Failure (MTBF) of 222,000 hours, ensuring reliability in various environmental conditions.

FAQs for the C3KX-NM-1G

  • What is the maximum transmission distance for Category 6a cabling?
    The maximum transmission distance for Category 6a cabling is 100 meters.
  • How does the switching fabric capacity of the 3750X series enhance network performance?
    The 3750X series features a switching fabric capacity of 160 Gbps, enabling efficient data processing and high-speed connectivity.
  • What are the DRAM specifications for the 3750X-12S and 3750X-24S models?
    The 3750X-12S and 3750X-24S models come with 512 MB of DRAM.
  • Can you specify the flash memory available on the 3750X-12S and 3750X-24S switches?
    Both the 3750X-12S and 3750X-24S switches are equipped with 128 MB of flash memory.
  • What is the total number of VLANs supported by this device?
    This device supports a total of 1005 VLANs.
  • How many VLAN IDs can the system recognize?
    The system can recognize up to 4K VLAN IDs.
  • What is the limit for Switched Virtual Interfaces (SVIs) on this hardware?
    The device supports up to 1K total Switched Virtual Interfaces (SVIs).
  • What are the acoustic noise levels for models equipped with GE SFP ports?
    For GE SFP port models, the typical acoustic noise level is LpA: 31 dbA, with a maximum of 34 dbA. The typical sound power level is LwA: 4.2 Bel, with a maximum of 4.5 Bel.
  • What environmental conditions are ideal for the storage of this networking hardware?
    The ideal storage environment for this hardware is a temperature range from -40°C to 70°C and an altitude of up to 15,000 ft, with a relative humidity of 5% to 95%, noncondensing.
  • What is the Mean Time Between Failure (MTBF) for this device?
    The Mean Time Between Failure (MTBF) for this device is 222,000 hours.

Product Review

The Cisco C3KX-NM-1G network module offers a substantial switching fabric capacity of 160 Gbps and supports a wide range of VLAN configurations, accommodating up to 1005 total VLANs and 4K VLAN IDs, which is beneficial for complex network environments. However, the module comes with a limited DRAM and Flash memory, providing only 256 MB and 64 MB respectively in its base configuration, which may restrict advanced functionality and future scalability. Noise levels are moderate, with acoustic noise reaching up to 46 dbA under load, potentially impacting deployment in noise-sensitive areas.


The Cisco C3KX-NM-1G module is a network module designed to enhance the capabilities of Cisco switches by offering additional Gigabit Ethernet ports. This module is compatible with various models in the Cisco 3750-X and 3560-X series, providing flexibility and scalability for network expansions or upgrades. The hardware specifications of the C3KX-NM-1G include support for Category 6a cabling, enabling connections up to 100 meters, and it operates within a switching fabric of 160 Gbps. This ensures efficient data transfer rates and high-speed connectivity for connected devices. Memory capacity varies depending on the specific model of the switch it is installed in, with DRAM of 256 MB available in standard models, and an enhanced 512 MB for the 3750X-12S and 3750X-24S models. Flash memory also varies, with 64 MB provided in standard models and 128 MB in the 3750X-12S and 3750X-24S models, supporting the storage of the operating system and configurations. The C3KX-NM-1G supports up to 1005 VLANs, providing extensive network segmentation capabilities. It can manage up to 4K VLAN IDs and supports up to 1K Switched Virtual Interfaces (SVIs), facilitating complex network setups and efficient traffic management. Acoustic noise levels are kept within acceptable ranges, with variations depending on the power supply and the model of the switch. Models with AC power supply and 16 PoE+ ports loaded produce a typical noise level of 43 dbA and can reach up to 46 dbA. For the GE SFP port models, the noise level is lower, with a typical level of 31 dbA and a maximum of 34 dbA. The module is designed to operate in a wide range of environmental conditions. It can function in temperatures ranging from -5 to 45°C at elevations up to 5000 ft. and -5 to 40°C at elevations up to 10000 ft. Storage conditions are also versatile, with a temperature range of -40 to 70°C and an altitude limit of 15,000 ft. The relative humidity for both operating and storage conditions should remain between 5% to 95%, non-condensing. Physical specifications of the module include a height of 1.73 inches, width of 17.5 inches, and depth of 20.5 inches, with a weight of 19.8 lb. This compact size allows for easy integration into existing network setups without requiring significant space. The module's total input BTU is 8525 BTU/Hr, indicating its power efficiency and heat generation during operation. Furthermore, it has a Mean Time Between Failure (MTBF) of 222,000 hours, underscoring its reliability and durability in continuous operation. Key hardware features include: - Support for up to 100 meters of Category 6a cabling - A switching fabric capacity of 160 Gbps - Compatibility with Cisco 3750-X and 3560-X series switches Overall, the Cisco C3KX-NM-1G network module is a vital component for businesses looking to enhance their network's performance and connectivity options, offering a blend of speed, reliability, and scalability.


Part Number and Manufacturer Cisco C3KX-NM-1G
Category 6a; Up to 100 meters
Switch Capacity 160 Gigabits per second
Memory - DRAM 256 MB (Upgraded to 512 MB for models 3750X-12S and 3750X-24S)
Storage - Flash 64 MB (Upgraded to 128 MB for models 3750X-12S and 3750X-24S)
Maximum VLANs 1005
VLAN ID Range Up to 4096
Switched Virtual Interfaces (SVIs) Up to 1000
Sound Level - AC Power, 16 PoE+ ports Typical: 43 dbA, Max: 46 dbA
Sound Power - AC Power, 16 PoE+ ports Typical: 5.2 Bel, Max: 5.5 Bel
Sound Level - GE SFP port models Typical: 31 dbA, Max: 34 dbA
Sound Power - GE SFP port models Typical: 4.2 Bel, Max: 4.5 Bel
Humidity Range (Non-operating) 5% to 95%, non-condensing
Storage Conditions Temperature: -40°C to 70°C, Altitude: up to 15,000 ft
Vibration Tolerance 0.41Grms, 3 to 500Hz, with specific spectral breakpoints
Dimensions Height: 1.73 in, Width: 17.5 in, Depth: 20.5 in
Weight 19.8 lb (9.0 kg)
Heat Dissipation 8525 BTU/Hr
Operational Temperature -5°C to 45°C (up to 5000ft), -5°C to 40°C (up to 10000ft)
Storage Temperature -40°C to 70°C
Operating Humidity 5% to 95%, non-condensing
Non-Operating Humidity 5% to 95%, non-condensing
Maximum Operating Altitude 10,000 ft (3000 m)
Maximum Storage Altitude 15,000 ft (4750 m)
Mean Time Between Failures (MTBF) 222,000 hours

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