Cisco IEM-3500-16T: High-Density Gigabit Expansion for the Cisco IE3500 Series

The Cisco IEM-3500-16T is a 16-port Gigabit Ethernet copper expansion module designed to scale the capabilities of Cisco IE3500 rugged industrial switches. Built for harsh environments and performance-critical industrial networks, this module delivers high-density connectivity, improved bandwidth capacity, and long-life reliability across manufacturing, utilities, transportation, and smart-city deployments.

This article explores key features, specifications, advantages, and typical use cases of the IEM-3500-16T while remaining optimized for search engines and technical readers.

Overview of the Cisco IEM-3500-16T Expansion Module

The IEM-3500-16T expansion module enhances an existing Cisco IE3500 switch by adding 16 Gigabit Ethernet copper ports. This increased port density helps organizations consolidate multiple network segments, simplify wiring infrastructure, and reduce the number of deployed switches—all while maintaining the ruggedness and performance expected from the IE3500 platform.

Engineered for extended temperature operation and industrial EMC compliance, the module supports mission-critical applications that demand continuous uptime.

Key Features of the IEM-3500-16T

High-Density Gigabit Copper Ports

The module provides 16 additional 10/100/1000 Mbps RJ-45 ports, allowing organizations to connect more field devices, controllers, sensors, and edge computing units without adding new chassis.

Rugged Industrial Design

Built to withstand shock, vibration, and extreme temperatures, the IEM-3500-16T is suitable for harsh operating environments such as outdoor enclosures, factory floors, and energy substations.

Seamless Integration with Cisco IE3500 Series

The expansion module is hot-swappable and fully compatible with the hardware and software architecture of the Cisco IE3500 family. It supports Cisco’s advanced industrial switching features, automation protocols, and cybersecurity framework.

Zero-Touch Provisioning and Cisco DNA Support

The module integrates into Cisco DNA Center workflows, enabling simplified setup, centralized management, and policy-based automation for large-scale industrial networks.

High Performance and Low Latency

Designed to handle real-time industrial traffic, the module delivers wire-speed forwarding and consistent low latency—ideal for Operational Technology (OT) applications.

Technical Specifications of the Cisco IEM-3500-16T

• Port Count: 16 Gigabit Ethernet copper ports
• Port Type: RJ-45 auto-negotiation, 10/100/1000 Mbps
• Switch Compatibility: Cisco IE3500 series base switches
• Expansions Supported: One expansion module per chassis
• Operating Temperature: –40°C to +75°C (varies by model/enclosure)
• Storage Temperature: –40°C to +85°C
• Relative Humidity: 5% to 95% (non-condensing)
• EMC Compliance: Industrial EN/IEC standards for noise immunity
• Power Consumption: Low-power, fanless design for field deployment
• Mounting: Internal expansion slot, tool-less insertion
• Software Features:
  • Cisco IOS XE
  • Layer 2 and Layer 3 switching
  • PROFINET, EtherNet/IP, Modbus TCP support
  • MACsec (hardware-dependent)
  • Cisco TrustSec and security policies

Benefits of Deploying the IEM-3500-16T Module

Scalable and Cost-Efficient Expansion

Instead of adding additional switches, organizations can expand port density through a single IE3500 base unit. This reduces installation costs, cabling complexity, and rack or panel space usage.

Designed for Harsh Industrial Environments

The module maintains performance in high-EMI, outdoor, or vibration-heavy environments where commercial switches fail.

Enhanced Network Visibility and Security

Integration with Cisco Cyber Vision, TrustSec, and segmentation policies ensures granular control over industrial assets and traffic flows.

Flexible Deployment for Modern OT/IT Convergence

Whether connecting sensors on an assembly line or IP cameras in a smart city, the module supports modern industrial standards and deterministic traffic patterns.

Common Use Cases

Manufacturing and Factory Automation

Connect PLCs, drives, HMI panels, and robots through a single, high-density industrial switch stack.

Smart Transportation and Intelligent Traffic Systems

Support roadside units, sensors, IoT devices, and video feeds over long operational cycles.

Energy and Utility Networks

Ideal for substations, renewable energy sites, and grid monitoring applications requiring rugged and secure Ethernet connectivity.

Oil, Gas, and Mining Operations

Handles extreme environmental conditions while maintaining reliable field connectivity.

Frequently Asked Questions (FAQs)

1. What is the primary purpose of the Cisco IEM-3500-16T?
It expands a Cisco IE3500 switch by adding 16 Gigabit Ethernet copper ports, increasing device connectivity without deploying additional switches.

2. Is the IEM-3500-16T suitable for harsh environments?
Yes. It is designed for industrial conditions and supports extended temperature ranges, shock tolerance, and EMI resistance.

3. Does the module require additional power?
The module draws power directly from the IE3500 chassis and is built for low-power, fanless operation.

4. Can this module be installed while the switch is powered on?
Yes. The design supports hot-swappable installation for minimal downtime, depending on the system configuration.

5. Does the IEM-3500-16T support industrial automation protocols?
It supports key industrial protocols such as PROFINET, EtherNet/IP, and Modbus TCP when used with the IE3500 platform running Cisco IOS XE.