SM-X-16G4M2X – 16x1G + 4×2.5G – 2x10G SFP+ – SM-X Switch Module

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SM-X-16G4M2X Description

The SM-X-16G4M2X is a Cisco single-wide SM-X Layer 2 EtherSwitch service module for Cisco ISR 4000 branches that need local access switching and fiber uplinks. The module has 16 1G RJ-45 ports, four 2.5G mGig RJ-45 ports and two SFP/SFP+ ports, with PoE and PoE+ on copper ports and UPOE on up to eight. It is supported on the Cisco 4461, 4451, 4351 and 4331, and 128-bit LAN MACsec needs a SEC license.

Quick Specs

Parameter

Specification

Product ID

SM-X-16G4M2X

Product type

SM-X Layer 2 EtherSwitch service module

Slot form factor

Single-wide SM-X

1G copper ports

16 RJ-45 ports

2.5G mGig ports

4 RJ-45 ports

10G fiber ports

2 SFP/SFP+ ports

Fiber-port mode

Each SFP+ port can use a 1G SFP or 10G SFP+ interface

PoE support

PoE and PoE+ on copper ports with supported PoE router power supplies

UPOE support

Up to 8 copper interfaces per module

MACsec support

128-bit LAN MACsec on copper ports with required software and SEC license when configured

Supported ISR 4000 platforms

Cisco 4461, 4451, 4351, and 4331 per Cisco interface table

Minimum IOS XE

16.12.1 on supported ISR 4000 platforms

Fiber port options

1G SFP or 10G SFP+ per SFP+ port

Application Scenarios

Branch Access Switching In The Router

At a branch with a Cisco 4331 or 4451, the module provides 16 Gigabit copper ports for desktops, phones and printers inside the router chassis, so the site needs no separate access switch.

Multigigabit Access With Fiber Uplink

A site with wireless access points that need 2.5G links can connect them to the four mGig ports and hand traffic to an aggregation switch over the two SFP+ ports at 10G.

Product Comparison

Parameter

SM-X-16G4M2X

SM-X-40G8M2X

NIM-ES2-8-P

1G copper ports

16 RJ-45

40 RJ-45

8 RJ-45

2.5G mGig ports

4 RJ-45

8 RJ-45

Not applicable

10G SFP/SFP+ ports

2

2

Not applicable

PoE capability

PoE and PoE+ on copper ports; UPOE on up to 8 copper interfaces

PoE and PoE+ on copper ports; UPOE on up to 8 copper interfaces

PoE/PoE+ on eight ports

Form factor

Single-wide SM-X

Double-wide SM-X

Single-wide NIM

Cisco 4000 ISR support

Cisco 4461, 4451, 4351, 4331

Cisco 4461, 4451, 4351

Cisco 4321, 4331, 4351, 4431, 4451

SM-X-16G4M2X is the single-wide SM-X module of this group, with 16 RJ-45 1G ports, 4 RJ-45 2.5G mGig ports and 2 SFP/SFP+ ports, while SM-X-40G8M2X is double-wide with 40 1G ports, 8 mGig ports and the same 2 SFP/SFP+ ports. A branch that needs the 40-port profile and can give up a double-wide slot orders SM-X-40G8M2X, which is listed for Cisco 4461, 4451 and 4351 but not for Cisco 4331, where SM-X-16G4M2X is supported. Where the free slot is a NIM position and eight PoE/PoE+ Gigabit ports are enough, NIM-ES2-8-P is the option, but it has no mGig or SFP/SFP+ ports, so sites that need 2.5G access or 10G uplinks stay on SM-X-16G4M2X.

Specifications

Parameter Specification Parameter Specification
Product ID SM-X-16G4M2X Product type SM-X Layer 2 EtherSwitch service module
Slot form factor Single-wide SM-X 1G copper ports 16 RJ-45 ports
2.5G mGig ports 4 RJ-45 ports 10G fiber ports 2 SFP/SFP+ ports
Fiber port options 1G SFP or 10G SFP+ per SFP+ port Fiber media support Single-mode and multimode fiber support listed by Cisco
Layer operation Layer 2 switching ASIC UADP 2.0 Mini compliant ASIC
PoE Supported on copper ports with supported router PoE power supplies PoE+ Supported on copper ports with supported router PoE power supplies
UPOE Up to 8 copper Ethernet interfaces per module MACsec 128-bit LAN MACsec on copper ports with IOS XE 17.3.1 or later support
MACsec license SEC license required where MACsec is configured on the router Module software license Supported at IP Base with no additional module-based license needed
Supported ISR 4000 platforms Cisco 4461, 4451, 4351, and 4331 Minimum IOS XE 16.12.1 on supported ISR 4000 platforms
SD-WAN baseline 17.3 on supported ISR 4000 platforms Weight 19.4 lb
Operating temperature 0 to 40°C Storage temperature -20 to 65°C
Operational humidity 5% to 85% Nonoperational humidity 5% to 95%

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    4.0

    No issues, wish it shipped sooner.

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    5.0

    Perfect.

    Megan
    Posted on 10/08/2026
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    5.0

    good selection

    Viktor R.
    Posted on 16/05/2026
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    4.0

    Good communication throughout. wish it shipped sooner

Questions & Answers

  • What role does SM-X-16G4M2X play?

    SM-X-16G4M2X is a single-wide Cisco SM-X Layer 2 EtherSwitch service module with 16 1G copper ports, four 2.5G Multigigabit ports, and two 10G SFP/SFP+ ports.
  • Which slot does SM-X-16G4M2X require?

    SM-X-16G4M2X requires one single-wide SM-X slot in a supported ISR 4000 router. It is not a NIM or a double-wide service module.
  • What power options are compatible with SM-X-16G4M2X copper ports?

    SM-X-16G4M2X provides PoE and PoE+ when the host router has a supported PoE power supply. Up to eight copper interfaces can use UPOE.
  • How does SM-X-16G4M2X differ from SM-X-40G8M2X?

    SM-X-16G4M2X provides 16 1G copper ports and four 2.5G Multigigabit ports. SM-X-40G8M2X increases the copper and Multigigabit port density.
  • Can SM-X-16G4M2X provide UPOE on eight interfaces?

    Yes, SM-X-16G4M2X supports UPOE on up to eight copper interfaces. The usable PoE total still depends on the host router and its power supplies.
  • Which MACsec requirements apply to SM-X-16G4M2X?

    SM-X-16G4M2X supports 128-bit LAN MACsec on copper ports when the required software and SEC license are present. MACsec is not enabled by hardware alone.

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