Cisco C9300X-NM-8M — Catalyst 9300X 8-Port 10G Multigigabit Copper Network Module
What it is
C9300X-NM-8M is a Cisco Catalyst 9300X Series network module that adds 8 × multigigabit copper RJ-45 uplink ports to compatible Catalyst 9300X switches.
Each port supports up to 10 Gigabit Ethernet, making the module useful for high-speed copper uplinks, switch-to-switch connections, servers, and other devices that require multigigabit connectivity over twisted-pair cabling.
Why buyers pick C9300X-NM-8M (plain English)
Eight 10G copper ports: Gives you a large number of high-speed RJ-45 interfaces without needing SFP+ optics.
Multigigabit flexibility: The ports support lower Ethernet speeds as well as 10G, so you can connect a mix of devices rather than being locked into one speed.
Uses standard copper cabling: Ideal when the infrastructure is based on Cat6A/Cat7 rather than fiber.
Built for Catalyst 9300X: Designed specifically for the modular uplink slot on compatible Catalyst 9300X switches.
Good for copper-heavy environments: A strong choice for server rooms, access/distribution links, and environments where RJ-45 is preferred over optical transceivers.
60-second spec box (C9300X-NM-8M)
Ports
- 8 × RJ-45 copper ports
- Multigigabit Ethernet
- Up to 10 Gigabit Ethernet per port
Supported speeds
- 100 Mbps
- 1 Gbps
- 2.5 Gbps
- 5 Gbps
- 10 Gbps
- Actual supported speeds can depend on switch model and software configuration
Interface type
- 10GBASE-T / multigigabit copper
- Standard RJ-45 connectors
- Designed for twisted-pair Ethernet cabling
Cabling
- Cat6A or better recommended for 10Gbps
- Lower speeds can operate over appropriate Cat5e/Cat6 cabling
- Maximum distance depends on speed and cable type
Compatibility
- Designed for Cisco Catalyst 9300X Series
- Supported in compatible C9300X network-module slots
- Not designed for standard Catalyst 9300 network-module slots
Deployment role
- High-speed copper uplinks
- Switch-to-switch links
- Server connectivity
- Copper-based aggregation
- Multigigabit campus networking
Where it fits (and when to choose something else)
Perfect for:
- Catalyst 9300X deployments needing 10G copper uplinks
- Server connections over RJ-45
- Copper-based switch aggregation
- Networks already wired with Cat6A
- Environments that want to avoid separate SFP+ optics
Choose something else if:
- You need 25G fiber uplinks → choose C9300X-NM-8Y
- You need 100G/40G QSFP connectivity → choose C9300X-NM-2C or C9300X-NM-4C
- You need long-distance links → fiber is usually the better option
- You have a standard Catalyst 9300 rather than a 9300X → use the appropriate C9300-NM module
TL;DR
C9300X-NM-8M is a Cisco Catalyst 9300X network module with 8 × 10G multigigabit RJ-45 copper ports — ideal for high-speed copper uplinks, server connections, and multigigabit enterprise networks.
