Linortek
Network bell & PA controllers

Web-control the bells, PA, or speakers you already have.

Network bell controllers and tone generators that add browser-based scheduling, tones, and emergency signals to your existing bells, PA, or speakers. No rewiring, no monthly fees. Find your exact controller in minutes.

Answer a few quick questions · no obligation

NetBell Controllers
Netbell network bell controller
Bell Controller
Netbell-NTG tone generator for existing PA
PA Tone Generator
  • Drive your existing bells, from 2 up to 8 independent zones
  • Add tones and up to 500 scheduled events to a PA or speakers you already own
  • No monthly fees and no rewiring, with optional VoIP/SIP phone paging

Trusted by teams at

Boeing Ford L3 Technologies Saab CAE USA ST Engineering Toyota Matson BD
How it works

Upgrade your existing system in three steps

No rewiring, no software to install. The controller runs on the network you already have.

1

Connect to what you have

Plug the controller into your network and wire it to your existing bells, PA, or speakers. Low-voltage, and most systems install in about two hours.

2

Schedule in your browser

Set bell, break, and shift-change times from a simple web interface. No dedicated PC, no keypad programming, no app to install.

3

It signals automatically

Your bells ring or your PA plays on schedule, up to 500 events, plus manual, emergency, and optional VoIP phone paging.

Works with what you have

Keep your existing bells, PA, or speakers

Swapping out an old mechanical bell timer? A network bell controller drops in and runs the hardware you already own from any browser.

Existing dry-contact bells Existing PA / amplifier 8-ohm passive speakers Old mechanical bell timers VoIP / SIP phone systems

Not sure which controller fits your setup? Build My System asks what you already have and recommends the exact model, with live pricing.

Built for your facility

One controller, every signaling job

From a school bell schedule to a multi-building PA, the right controller for the system you run.

Schools & Campuses

Run class-period bells and break schedules from any browser. A web-based school bell controller that replaces the old mechanical timer.

Factories & Manufacturing

Automate shift changes, breaks, and line-stop signals on your existing bells or PA, with up to 500 scheduled events.

Warehouses & Distribution

Drive break bells across the floor, or add scheduled tones and announcements to the PA you already have.

Multi-Building Sites

Coordinate bells and PA across separate buildings on one shared, network-based schedule.

The NetBell controller line

Which controller fits your system?

Every controller includes built-in web-based scheduling software, designed, developed, and supported in the USA. Pick the one that matches what you already have.

Drive your existing bells
ControllerBell zonesSchedule setsManual
Netbell-2 bell controllerNetbell-22-output bell controller Bell zones2 Schedule sets1 · 500 events ManualYes Netbell-4K bell controllerNetbell-4K4-output bell controller Bell zones4 Schedule sets1 · 500 events ManualYes Netbell-8 bell controllerNetbell-88-output bell controller Bell zones8 Schedule sets1 · 500 events Manual— Netbell-Ultra 300 bell controllerNetbell-Ultra 300advanced, DIN-rail Bell zones2 Schedule sets10 · 500 events ManualYes
Add to your existing PA or speakers
ControllerWhat it addsDrives
Netbell-NTG tone generatorNetbell-NTGPA tone generator What it addsScheduled tones & messages DrivesExisting PA / amp Netbell-NTG-A100 tone generator with amplifierNetbell-NTG-A100tone generator + amplifier What it addsTones + built-in amplifier DrivesPassive 8-ohm speakers
Phone paging add-on
ControllerFunction
Netbell-AU-711 SIP paging gatewayNetbell-AU-711SIP paging gateway FunctionPage from VoIP / SIP phones

Not sure which fits? Build My System picks the exact controller from a few questions.

More than a timer

Everything the controller does

Bell scheduling, tones, and paging, all managed from the same web interface.

Scheduled bell & shift signals

Up to 500 events for class periods, breaks, lunches, and shift changes. Set it once and it runs itself.

Multiple schedule sets

The Netbell-Ultra 300 holds up to 10 schedule sets for different days, seasons, or buildings.

Tones & audio over your PA

The NTG adds scheduled tones and recorded messages to a PA you already own.

Built-in amplifier option

The NTG-A100 drives your existing 8-ohm passive speakers directly, with no separate amplifier needed.

VoIP / SIP phone paging

Add the Netbell-AU-711 gateway to trigger announcements from your existing VoIP desk phones.

No subscription

One-time purchase that runs on your own network, with battery backup of all your settings.

For your IT & facilities team

Installation & technical requirements

Everything your network and maintenance team needs to scope the install. Expand any section for details.

  • Controller: 10/100 Base-TX Ethernet, PoE or 12/24VDC
  • Bell outputs: dry-contact relays (Normally Open) to your existing bells; 2, 4, or 8 outputs by model
  • PA models: line-level output (NTG) or built-in amplifier for 8-ohm speakers (NTG-A100)
  • Wiring: low-voltage; most systems install in about two hours
  • Management: built-in web server, configured from any browser, no software to install
  • Offline: once schedules are set, it runs without an internet connection
  • Power outage: built-in rechargeable battery keeps all settings
  • Recovery: schedule resumes automatically when power returns
  • Events: up to 500 scheduled events for class periods, breaks, shifts, reminders, and drills
  • Schedule sets: 1 on most models; up to 10 sets on the Netbell-Ultra 300
  • Manual triggers: digital inputs accept a palm button or push switch for on-demand or emergency signals
  • Existing bells: Netbell-2 (2), Netbell-4K (4), Netbell-8 (8), or Ultra 300 dry-contact outputs
  • Existing PA: Netbell-NTG line output for scheduled tones and messages
  • Passive speakers: Netbell-NTG-A100 with built-in amplifier for 8-ohm speakers
  • VoIP phones: Netbell-AU-711 SIP gateway to page from your phone system
Why Linortek

American-designed, expert-supported

You're buying direct from the source, not a reseller, with real people who know the product.

No monthly fees

A one-time hardware purchase. No recurring software subscriptions, ever.

On-premise, you own it

Runs on your own network and keeps working without internet after setup. No cloud lock-in.

Designed & developed in the USA

Hardware and software designed, developed, and supported in the United States, sold direct from the source.

Backed for the long haul

US-based lifetime technical support, a 1-year warranty, and free firmware updates. Real people who know the systems.

Questions, answered

Frequently asked

Yes. The Netbell bell controllers drive your existing dry-contact bells over the network, from 2 zones (Netbell-2) up to 8 zones (Netbell-8). They drop in where an old mechanical bell timer was and run from any browser.
Yes. It is a web-based school bell controller: set class periods, breaks, and bell schedules from any browser, with up to 500 events. The Netbell-Ultra 300 holds up to 10 schedule sets for different days or seasons.
Yes. The Netbell-NTG adds scheduled tones and messages to your existing PA or amplifier. For live paging, add the Netbell-AU-711 gateway. For passive speakers with no amp, the NTG-A100 has a built-in amplifier.
From 2 (Netbell-2) to 8 (Netbell-8) independent dry-contact bell zones, with 4-zone (Netbell-4K) in between. Need more than 8? Build My System routes you to an expert for a multi-controller layout.
Yes. Add the Netbell-AU-711 SIP paging gateway and staff can trigger announcements directly from your existing VoIP / SIP desk phones.
No. It is a one-time hardware purchase with no subscriptions. The web scheduler runs on the controller itself, so there is nothing to renew.
A built-in rechargeable battery keeps all your settings. When power returns, the controller automatically resumes its programmed schedule.
No. The controller is low-voltage and runs on your existing network. Most customers have it wired to their bells or PA and fully operational within about two hours.
Yes. A palm push button or basic push switch wired to the controller's digital input rings your bells or sounds your PA on demand or for emergencies. (The 8-output Netbell-8 is schedule-driven without a manual input.)