Four Optional Network Modules for Cisco Catalyst Switches
The Cisco Catalyst 3750-X Series and 3560-X Series Switches support four optional network modules for uplink ports. The 4 optional network modules are C3KX-NM-1G, C3KX-NM-10G, C3KX-NM-10GT and C3KX-SM-10G=.
What are the exact four optional network modules? Let’s have an overview on them.
C3KX-NM-1G: The module has four 1-Gigabit SFP module slots. Any combination of standard SFP modules is supported. SFP+ modules are not supported. If you insert an SFP+ module in the 1-Gigabit network module, the SFP+ module does not work, and the switch logs an error message.
Figure1: C3KX-NM-1G-1 Gigabit Ethernet Network Module
1 | Network module | 3 | LEDs |
2 | 1 Gigabit Ethernet SFP slots | 4 | Captive screws |
C3KX-NM-10G: The module has four slots. Two slots support only 1-Gigabit SFP modules. Two slots support either 1-Gigabit SFP or 10-Gigabit SFP+ modules. (Note: The GLC-T SFP is not supported on the SFP+ slots of C3KX-NM-10G.) The four slots are grouped as two pairs, with each pair consisting of one SFP slot and one SFP+ slot. Each pair supports either two 1-Gigabit SFP modules or one 10-Gigabit SFP+ module. A 10-Gigabit SFP+ module cannot operate at the same time as the corresponding 1-Gigabit SFP module in the pair.
Figure2: C3KX-NM-10G-10-Gigabit Ethernet Network Module-SFP Ports
1 | Network module | 4 | LEDs |
2 | 1 Gigabit Ethernet SFP slots | 5 | Captive screws |
3 | 1 Gigabit or 10 Gigabit Ethernet SFP+ slots |
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Supported combinations of SFP and SFP+ modules:
- Slots 1, 2, 3, and 4 with 1-Gigabit SFP modules
- Slots 1 and 2 with 1-Gigabit SFP modules and Slot 4 with one 10-Gigabit SFP+ module
- Slot 2 with one 10-Gigabit SFP+ module and Slots 3 and 4 with 1-Gigabit SFP modules
- Slot 2 and Slot 4 each with 10-Gigabit SFP+ modules
A 10-Gigabit SFP+ module takes precedence over a 1-Gigabit SFP module except when an SFP module is first inserted in Slot 1 and has link. When you insert an SFP+ module in Slot 2, the SFP in Slot 1 retains link. The SFP+ module in Slot 2 does not operate.
When the SFP module in Slot 1 is shutdown, loses link, or is removed, the SFP+ module in Slot 2 turns on. The SFP module in Slot 1 does not work as long as an SFP+ module is in Slot 2, whether it has link up or not. The same precedence applies to Slots 3 and 4.
C3KX-NM-10GT: This module has two (copper) ports that support speeds of 1Gps or 10Gps.
Figure3: C3KX-NM-10GT-Two Port 10G BaseT Network Module
C3KX-SM-10G=: This module has two slots that support either 1-Gigabit SFP or 10-Gigabit SFP+ modules (Te1/Gi2 and Te2/Gi4). The service module supports Net Flow and MACSec Uplink Encryption (switch- to-switch encryption between uplinks).
Figure4: C3KX-SM-10G-10G Service Module
1 | Service module | 2 | 1-Gigabit or 10-Gigabit Ethernet SFP+ slots |
3 | LEDs | 4 | Captive screws |
C3KX-NM_BLNK=: The module has no ports.
Figure5: Blank Network Module
1 | Network module | 2 | Captive screws |
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