Cisco IEM-3400-8P — IE3400 8-Port PoE+ Gigabit Ethernet Expansion Module
What it is
IEM-3400-8P is a Cisco Industrial Ethernet 3400 Series expansion module that adds 8 × Gigabit Ethernet PoE+ ports to a supported Industrial Ethernet chassis (like the IE-3400 base platform).
It extends port density and delivers Power over Ethernet Plus (PoE+) for powering devices at the network edge in industrial and harsh environments.
Why buyers pick IEM-3400-8P (plain English)
PoE+ for field devices
Provides 8 Gigabit Ethernet ports with PoE+ power to support IP cameras, wireless access points, VoIP phones, industrial sensors, and other powered devices without separate power injectors.
Seamless expansion
Plugs into the IE3400 chassis expansion slot, letting you build out port density as needed without replacing the whole switch.
Industrial-grade design
Built for rugged environments with extended temperature and vibration tolerance — ideal for factories, transportation, utilities, and outdoor enclosures.
Consistent Cisco IOS experience
Managed via Cisco IOS for a consistent configuration model alongside enterprise Catalyst gear.
Simple deployment
Module form factor and integrated PoE make it easy to add powered Gigabit connectivity in distributed industrial sites.
60-second spec box (IEM-3400-8P)
Module type
Expansion module for Cisco IE3400
Downlink ports
8 × 10/100/1000BASE-T (RJ-45)
PoE support
PoE+ (IEEE 802.3at) on all 8 ports
Speed
Gigabit Ethernet
Form factor
IE3400 expansion module
Management
Cisco IOS CLI / SNMP / NETCONF
Use case
Industrial edge switching with powered device connectivity
Where it fits (and when to choose something else)
Perfect for:
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Industrial access networks needing PoE+ for cameras, APs, and sensors
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Expanding port count on IE3400 platforms
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Harsh environments with ruggedized requirements
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Distributed IoT and OT networks
Choose something else if:
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You need fiber uplinks on the expansion — use fiber SFP/SFP+ modules
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You need more than 8 PoE ports → additional expansion modules or larger chassis
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Your environment is strictly enterprise (no industrial specs needed) → use Catalyst access switches
TL;DR
IEM-3400-8P is Cisco’s 8-port Gigabit PoE+ expansion module for the IE3400 Series:
a rugged, powered port expansion option that delivers PoE+ Gigabit Ethernet at the industrial edge.
