ModemTec is reliable producer and supplier of comprehensive solutions in the field of  medium and low voltage lines diagnostics, and power line communication. Metering International magazine placed ModemTec in TOP 50 world’s most important companies in the area of Smart Metering / Smart Grid.

Offered Solutions

Partial Discharge Diagnostic

Online diagnostic with PD Doctor system for low and medium voltage.

Medium Voltage PLC Communication

Communication over medium voltage lines up to 35 kV.

Low Voltage PLC Communication

Data transfers over existing power lines up to 1000 V.

PLC Cleaner for Smart Grids

Diagnostic tool to increase communication reliability.

Power Line Communication

What is PLC Communication?

PLC (Power Line Carrier) Communication technology uses power distribution lines and wires for data transmission. This technology does not require any special cables.

Advantages of PLC Communication

  • Easy installation – no need to install additional cables, antennas, or wireless transmitters
  • Own communication channel – reliable, stable, and secure network without fees and restrictions
  • Independence from mobile operators – no need for signal coverage and third party dependency

PLC Communication Over Medium Voltage Lines

Key Features

  • Operates on power lines up to 22 kV (35kV)
  • Extraordinary communication distance:
    • Cable lines up to 10 km
    • Overhead lines up to 50 km
  • Communication interfaces RS485, RS232, Ethernet*
  • Robust and encrypted communication
  • Line parameters adjustment
  • Automatic network routing*
  • Suitable for both, indoor and outdoor installation

*Valid for MT-MVPLC1-S modem

Modem Comparison

PLC standardMTECG3-PLC
Max. communication rate10 kbps100 kbps
Communication interfacesRS485, RS232RS485, RS232, Ethernet
Reliable and robust communication
Carrier frequency adjustment
Extended cybersecurity
Automatic line quality adjustment
Automatic routing
Remote configuration

PLC Communication Over Low Voltage Lines

Key Features

  • Operates on any power lines 0 to 1,000 V
  • Communication interface RS485, RS232 or RS422
  • Communication distance up to 5,000 m
  • Single-phase and three-phase variants
  • Advanced DSP algorithms and error-correction codes
  • Routing in the network
  • High transmission output, narrowband communication
  • Easy configuration through RSet application

Typical Applications

  • Communication in the industry and transport
    • Production processes, energy balance
    • Connection with remote sites (boreholes, treatment plants, Photovoltaics …)
    • Maritime transport automation systems
  • Smart grids
    • Meter readings (electricity, water, heat, gas …)
    • Distribution control
  • Building automation
    • Industrial areas, office and residential buildings
    • Museums, archives, historic buildings, halls and stadiums

Modem Comparison

Number of phases for Rx/Tx13
Max. communication rate10 kbps10 kbps
InterfacesRS232, RS485RS232, RS485, RS422
Binary state transfer
Carrier frequency adjustment
Possibility of external coupling

Company Introduction


The company is based in Třinec, near Ostrava, the third largest city in the Czech Republic. The R&D teams are located in Brno and Prague.


Development activities are realized by experienced team of workers in the unique Center for Intelligent Energy. This facility was built with total investment costs of USD 1 mil. is used for the development of devices that meet the current and future needs of the energy sector, including high-voltage electrical engineering.


ModemTec currently employs almost 50 employees. It has own production capabilities, competence for assembly and re­covery, and provides pre­mium service for its cu­sto­mers, including post-warranty service.


The company closely coope­rates with the prestigious universities, including the UWB Pilsen, CTU Prague, BUT Brno and VSB-TUO Ostrava.


Our products and solutions are currently used in more than 40 countries around the world.


ModemTec s.r.o.
Oldřichovice 738
739 61 Třinec
Czech Republic

+420 558 558 311

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