Cisco C9300X-NM-4C — Catalyst 9300X 4-Port 100G/40G QSFP Network Module
What it is
C9300X-NM-4C is a Cisco Catalyst 9300X Series uplink network module that adds 4 × high-speed QSFP ports to compatible Catalyst 9300X switches.
Each port supports 100 Gigabit Ethernet or 40 Gigabit Ethernet, giving the switch up to four very high-bandwidth uplinks for campus aggregation, core connectivity, data-center interconnects, and backbone applications.
Why buyers pick C9300X-NM-4C (plain English)
Four 100G uplinks: Provides substantially more uplink capacity than 2-port modules, making it ideal for dense multigigabit access environments.
40G compatibility: Each port can also operate at 40Gbps, useful when connecting to existing QSFP+ infrastructure.
Built for high-bandwidth campus networks: A strong match for Catalyst 9300X switches with lots of 5G/10G access traffic.
Flexible optics: Supports a range of compatible Cisco QSFP28 and QSFP optics, DACs, and AOCs depending on distance and deployment requirements.
Modular design: Lets you select or upgrade the uplink configuration independently of the switch chassis.
60-second spec box (C9300X-NM-4C)
Ports
- 4 × QSFP uplink ports
- High-speed modular uplink design
Supported speeds
- 100 Gigabit Ethernet
- 40 Gigabit Ethernet
- Speed depends on installed optic / cable and configuration
Interface type
-
QSFP28 for 100GbE
- Compatible QSFP+ optics for 40GbE
- Supports hot-swappable transceivers and cables
Typical optics / cabling
- 100G QSFP28 optics
- 40G QSFP+ optics
- Direct Attach Copper (DAC)
- Active Optical Cables (AOC)
- Single-mode or multimode fiber depending on transceiver
Compatibility
- Designed for Cisco Catalyst 9300X Series switches
- Fits compatible C9300X modular uplink slots
- Not designed for standard Catalyst 9300 network-module slots
Deployment role
- High-speed campus uplinks
- Distribution-layer connectivity
- Core connectivity
- Switch-to-switch backbone links
- High-bandwidth aggregation
Where it fits (and when to choose something else)
Perfect for:
- Catalyst 9300X switches needing multiple 100G uplinks
- High-density multigigabit access networks
- Campus core/distribution connections
- Large enterprise environments
- Networks migrating from 40G to 100G
Choose something else if:
- You only need 2 × 100G/40G ports → choose C9300X-NM-2C
- You need 25G / 10G / 1G SFP connectivity → choose C9300X-NM-8Y
- You need multigigabit copper uplinks → choose C9300X-NM-8M
- You are using a standard Catalyst 9300 → select the appropriate C9300-NM module
TL;DR
C9300X-NM-4C is a Cisco Catalyst 9300X uplink module with 4 × QSFP ports supporting 100GbE or 40GbE — designed for very high-capacity campus aggregation, distribution, and backbone connectivity.
