4120 Series Installation Guide
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Technical Specifications
> Memory
Extreme Networks, Inc. August 01, 2026
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Introduction to the 4120 Series Installation Guide
Text Conventions
Documentation and Training
Help and Support
Send Feedback
New in this Guide
4120 Cloud Managed Switch Overview
4120-24MW-4Y Switch Features
4120-48MW-4Y Switch Features
Manage Your Switch
Universal Ethernet Ports
Power Supplies for Use with Your Switch
Build Stacks
Introduction to Stacking
Build Basic Stacks
Slot Numbers in Stacks
Primary/Backup Switch Redundancy
SummitStack Topologies
Ring Topology: Recommended for Stacking
Daisy Chain Topology: Not Recommended for Stacking
SummitStack Terms
Plan to Create Your Stack
Enable and Disable the Stacking Support Option
Recommendations for Placing Switches for Stacked Operation
Recommendations for Configuring Stacks
Combine Switches from Different Series
Select Stacking Cables
Use the Extreme Stacking Tool
Set up the Physical Stack
Connect the Switches to Form the Stack Ring
Examples of Valid Stacking Configurations
Example: Basic Stack with Four Switches
Example: Basic Stack with Eight Switches
Example: Stacked Switches across Several Racks
Connect Your Stack to the Management Network
Site Preparation
Plan Your Site
Operating Environment Requirements
Meet Building and Electrical Codes
Set Up the Wiring Closet
Control the Temperature
Control the Humidity Level
Protect Your System from ESD (Electrostatic Discharge)
Rack Specifications and Recommendations
Mechanical Recommendations for the Rack
Ground the Rack
Provide Adequate Space for the Rack
Secure the Rack
Evaluate and Meet Cable Requirements
Label Cables and Keep Accurate Records
Install Cable
Handle Fiber Optic Cable
Cable Distances and Types
Use RJ45 Connector Jackets
Prevent Radio Frequency Interference (RFI)
Meet Power Requirements
Requirements for PoE Devices
Power Supply Requirements
Power Cord Requirements
UPS (Uninterruptible Power Supply) Requirements
Select a UPS
Calculate Volt-Amperage Requirements
Provide a Suitable UPS Transition Time
Follow Applicable Industry Standards
Install Your Switch
Safety Considerations for Installation
What You Will Need for the Installation
Attach the Switch to a Rack or Cabinet
Install Optional Components
Connect Network Interface Cables
Turn on the Switch
Activate and Verify the Switch
Connect to a Management Console
Log In for the First Time on Switch Engine
Configure the Switch's IP Address for the Management VLAN
Remove and Replace Components
Remove and Replace an AC Power Supply
Remove a Switch from a Rack
Monitor the Switch
4120 Series System LEDs
Technical Specifications
4120 SeriesTechnical Specifications
Acoustics
Memory
Mean Time Between Failures (MTBF)
Power Specifications
Environmental
Standards
Safety Information
Considerations Before Installing
General Safety Precautions
Maintenance Safety
Fiber Optic Ports and Optical Safety
Cable Routing for LAN Systems
Power Cord Requirements for AC-Powered Switches and AC Power Supplies
Select Power Supply Cords
Install Power Supply Units and Connect Power
Battery Notice
Battery Warning - Taiwan
Regulatory Information
CE statement
EMC Warnings
China and Taiwan: Restriction of Hazardous Substances (ROHS)
Canadian requirements
Australia (RCM)
Federal Communications Commission (FCC) Notice
Germany statement
KCC statement (Republic of Korea)
Japan (VCCI Class A)
Japan power cord
Memory
The following table includes memory specifications for the
4120 Series
switches.
Specifications
1 GB DDR3L memory
4 GB memory
8 MB SPI flash memory
