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VFT product family

The VFT family consists of various VFT boards which are based on the binary frequency shift keying (FSK) transmission procedure. This is a very robust system with a good track record for transmitting mission-critical data via copper wire. All VFT boards have one common denominator: fully transparent transmission of a serial incoming signal. In other words, parameterising baud rates, start and stop bits, as well as parity, is not necessary.

Selective VFT is based on signal-processor technology. With digital filters it implements bandlimiting transmission channels compliant with IT-CCITT for transmission rates of 50 to 2400 bps in the 300-3400 Hz voice band. In this case several channels can be flexibly placed in the frequency multiplexer, so that a line of several VFT boards can be used at the same time.

SWT is a new generation of conventional VFT boards that is aiming for faster data rates. It allows the operation of a multidrop VFT party line modem to telecontrol lines with a variety of staggered tributary stations with a permanent transmission channel and without any complex filtering. The SWT board is available for up to 9600 bps and as a V.23 modem for up to 1200 bps.

As a cost-effective board with top-hat-rail assembly, the SWT board has been designed to transmit on 2-wire and 4-wire copper lines. It’s particularly ideal when advanced transmission networks, such as TCP/IP networks with protocols like IEC 60870-5-101 or 104, have to integrate existing telecontrol lines with staggered tributary stations. A 2-wire plug-on module for assembly in customers’ own devices is also available.

Applications

  • Traditional telecontrol applications, telecontrol channels in frequency division multiplexing
  • Supports data volumes in the IEC 60870-5-101 protocol
  • Identifies figures in meters in residential and industrial buildings
  • A replacement for VFT devices, compliant with ITU-T V.23

Attributes

WT 2400

  • A selective VFT device 50 … 2400 bps
  • All functions are software-based with one piece of hardware for all channels
  • No termination hybrid, no levelling necessary and easy to commission based on the table
  • A high level of selectivity, low isochronous distortion, precorrector integrated

HY101 SWT

  • Super VFT for 9600 bps and 20 km @ 0.8 mm line diameter
  • Alternatively V.23 with 1200 bps and 30 km @ 0.8 mm line diameter
  • Cost-effective solution in a top-hat-rail body

SWT CE

  • Super VFT for 9600 bit/s and 20 km @ 0.8 mm line diameter
  • Alternatively V.23 for 1200 bit/s and 30 km @ 0.8 mm line diameter
  • Compact two-wire module 6 x 9 cm for assembly in customers’ devices

Information

Title Filesize Type
Product Brief HY101 SWT 65.9 KB pdf
Product Brief HY101 WT2400 67.9 KB pdf

Support and Downloads

Downloads for HYTEC products, e.g. operating manuals, firmware, supplementary files like SNMP MIBs, automated scripts, templates and other files can be found in Downloads.