Global Directory

  • HVAC Equipment
    • Johnson ControlsJCI logo
    • YORKyork-process-system-logo
    • Championchampion
    • ColemanColeman logo
    • EnvirotecEnviro-Tec logo
    • LuxaireLuxaire Heating & Cooling logo
    • Miller-Pickingmiller-picking-logo
    • PacePace-logo
    • QuantechQuantech logo
    • Silent-AireSilentAire Logo
    • TempmasterTempMaster logo
    • TriatekTriatek logo
  • Industrial Refrigeration
    • YORKyork-process-system-logo
    • FrickFrick Industrial Refrigeration logo
    • M&M Carnotmm-carnot logo
    • SabroeSabroe logo
    • York Process Systemsyork-process-system-logo
  • Digital Solutions
    • OpenBlueOpenBlue Logo
    • FM:Systemsfm system logo
  • Building Automation and Controls
    • Johnson ControlsJCI logo
    • MetasysMetasys icon
    • Facility Explorerfacility explorer
    • EasyIOEasyio Logo
    • PENNpenn
  • Retail Solutions
    • Sensormaticsensormatic-logo
  • Fire Suppression
    • Tyco Firetyco
    • AnsulAnsul
    • ChemguardChemguard logo
    • SkumSkum logo
    • HygoodHygood logo
    • GrinnellGrinell logo
    • SprinkCADSprinkCAD logo
    • Pyro ChemPyro-Chem logo
    • AquaMistaquamist_logo
  • Fire Detection
    • AutocallAnsul logo
    • FireClassFireClass logo
    • SimplexSimplex logo
    • ZettlerZettler logo
    • VigilantVigilant logo
    • DBEDBE written on a white background
  • Security
    • American Dynamicsad
    • DSCdsc
    • ExacqExacq
    • Illustraillustra
    • Kantechkantech
    • IQIQ logo
    • Software HouseSoftware House
    • Bentel Security bentel
    • CEM SystemsCEM Systems  logo
    • CloudvueCloudvue logo
    • SESSES Logo Image
    • Visonicvisonic
JCI Logo
  • Login
  • Login
  • Products and Solutions
    Products and Solutions
    • Addressable Systems
      Addressable Systems
      • Addressable Systems
      • Foundation Series Addressable Fire Alarm Control Units
      • 4100ES Fire Alarm Control System
      • 4007ES Fire Alarm Control System
      • 4010ES Fire Alarm Control System
      • 4017ES Fire Alarm Control System
    • Conventional Systems
      Conventional Systems
      • Conventional Systems
      • Foundation Series Conventional Fire Alarm Control Units
      • 4003EC Voice Control System
      • 4004R Suppression Releasing System
    • Addressable Sensors and Bases
      Addressable Sensors and Bases
      • Addressable Sensors and Bases
      • TrueAlarm Addressable Sensors and Bases
      • MX Addressable Sensors and Bases
      • Specialty Addressable Sensing Solutions
    • Addressable Pull Stations and Callpoints
      Addressable Pull Stations and Callpoints
      • Addressable Pull Stations and Callpoints
      • MX Addressable Callpoints
      • TrueAlarm Addressable Pull Stations
    • Addressable Peripheral Devices
      Addressable Peripheral Devices
      • Addressable Peripheral Devices
      • MX I/O Modules and Peripherals
      • TrueAlarm I/O Modules and Peripherals
    • Conventional Sensors and Bases
      Conventional Sensors and Bases
      • Conventional Sensors and Bases
      • TrueAlarm Conventional Sensors and Bases
    • Conventional Pull Stations and Callpoints
      Conventional Pull Stations and Callpoints
      • Conventional Pull Stations and Callpoints
      • TrueAlarm Conventional Pull Stations
    • Addressable Notification
      Addressable Notification
      • Addressable Notification
      • TrueAlert ES Addressable Notification Appliances & Speakers
      • TrueAlert Visual Messaging Solutions
    • Conventional Notification
      Conventional Notification
      • Conventional Notification
      • TrueAlert Non-Addressable Notification Appliances & Speakers
    • Networks and Workstations
      Networks and Workstations
      • Networks and Workstations
      • TrueSite Workstation Management Solutions
      • ES Net High Speed Networks
      • Integration Solutions
      • Simplex Incident Manager
    • Services
      Services
      • Services
      • Programming Services
      • SafeLINC Connected Services Suite
      • Training Services
    • Connected Fire
      Connected Fire
      • Connected Fire
      • Connected Hardware
      • Connected Solutions
  • Services & Support
    Services & Support
    • Technical Documentation
      Technical Documentation
      • Technical Documentation
      • Data Sheet Library Index
    • Resources for Architects and Specifying Engineers
      Resources for Architects and Specifying Engineers
      • Resources for Architects and Specifying Engineers
      • Revit Files
    • FQQ Sales and Design Tool
    • Product Catalogs
  • Insights
Search
Contact Us
  1. Simplex
  2. Networks and Workstations
  3. 4120 Networking
Product Image
  • Product Image

4120 Networking

Simplex 4120 Fire Alarm Network

4120 Network communications among system fire alarm control panels provides support for up to 99 nodes per network loop, network emergency voice broadcasts and centralized command center operations.

  • Enjoy flexible network communications available for wired or fiber optic connections.
  • Use of InfoAlarm command center equipped nodes to provide increased network information display capability.
  • Physical bridge modules connect multiple network loops and provide star topology connections.
Back to Top

4120 Networking

  • Overview
  • Features
  • Benefits
  • Product Documentation
  • Related Products

    Compliance and control without compromise

    The Simplex 4120 network enables reliable communication between fire alarm control units, supporting up to 99 nodes per loop for emergency voice broadcasts and centralized command center operations. Multiple loops can be configured for large sites like campuses. The system allows network-wide control of functions like alarm silence, acknowledge and reset, along with detailed point status visibility. Its distributed architecture ensures connected nodes keep communicating during faults. Flexible annunciator options enable tailored monitoring. InfoAlarm-equipped nodes enhance system visibility, while network-level control allows manual operation of individual points.
    Compliance and control without compromise

    Features

    • Network-wide initiation of alarm silence, acknowledge, and reset; and investigation of status and details of system points and point lists
    • Used with 4100ES, 4100ESi, 4100U, 4007ES, 4010ES and 4010 Series Fire Alarm Control Units.
    • Flexible network annunciator options such as TrueSite Workstations, Network Display Units (Voice Command Center)

    Benefits

    Fault Tolerant
    FAULT TOLERANT

    Distributed system operation ehlps ensure excellent survivability; during a communications fault condition, network nodes remaining connected will regroup and continue communicating.

    Designed For Compliance
    DESIGNED FOR COMPLIANCE

    Engineered to align with multiple modern fire protection codes and system integration requirements, making it easier to meet compliance with confidence.

    Flexible Wiring
    FLEXIBLE WIRING

    Wired communications are available on network interface cards (NICs); available with either wired connections, or as a modular design allowing selection of either wired or fiber optic media modules.

    Technical Resources

    Document Name
    Description
    Language
    Resource Type

    User Guide

    LT0290 (English)

    Simplex 4120 Network Fire Indicator Panel 2500 Network Display Unit User Guide

    English User Guide
    View
    No resource found for selected filter

    Back

    Next

    Looking for more Resources

    Related Products

    Australia 4100ESi Fire Alarm Control Units

    Australia 4100ESi Fire Alarm Control Units

    Contact Us
    Find a Partner
    • Addressable Systems
    • Conventional Systems
    • Addressable Sensors and Bases
    • Addressable Pull Stations and Callpoints
    • Addressable Peripheral Devices
    • Conventional Sensors and Bases
    • Conventional Pull Stations and Callpoints
    • Addressable Notification
    • Conventional Notification
    • Networks and Workstations
    • Services
    • Connected Fire
    • Technical Documentation
    • Resources for Architects and Specifying Engineers
    • Insights
    Simplex logo
    Connect With Us
    • LinkedIn logo
    JCI Logo
    © 2026 Johnson Controls. All Rights Reserved.
    • Privacy Policy
    • Legal
    • Terms & Conditions