equipment and systems communications


Navtex Systems Navtex Systems Navtex Systems Navtex Systems

The Navtex system is defined, by the IMO standard, as a system for the automatic broadcast and reception of information on maritime security by means of direct telegraphy printing of the narrow band.

The Navtex Transmission System is based in a Server/Client architecture that allows the maximum reliability, flexibility and scalability by using independent units. It has an efficient intercommunication between the units for a limited consumption of broad band in order to guarantee the operation of the Navtex transmission system regardless the communication availability between the units and centers.

The four important characteristics that distinguish the INVELCO system are:

  • A single manager can operate up to 8 coastal stations, with the possibility of working in the 490KHz, 518KHz and 4209.5KHz with automatic control of all its parameters.
  • The system has in each coastal station a transmissions’ local controller (Navtex remote control) with all the information stored that comes previously from the Navtex operation manager in order to establish automatic and independent transmissions of the operation manager and its communication. This avoids the communication breakdown problems between the control center and the coastal station.
  • The system can be configured with independent transmitters for each of the operation frequencies or with a single Invelco transmitter that allows operating in the three frequencies.
  • Possibility of redundant communication between the operation manager and each coastal station. Up to 3 different IP channels of communication.

The main units of the system are:

  • Navtex Operation Manager (PC Software in the Control Center).
  • Navtex Remote Control (GX-400-A Unit in the Navtex Transmission Center).
  • Navtex Transmitter (RF Transmission Unit in the Navtex Transmission Center).

The Navtex Transmission System has the possibility of simultaneously manage the transmissions in 518 KHz, 490 KHz y 4209.5 KHz frequencies of one (1) to eight (8) Navtex Transmission stations. Each station is defined in the systemindividually with its own characteristics (station code, operation frequencies, schedules (time slots), transmitters, powerlevels, etc.)

System Features
IP Network infrastructure.
Network support (Frame Relay, ADSL, DSL, RDSI, GPRS/UMTS, Analogial Dedicated Line, etc.)
Allows up to 3 IP simultaneous communication channels for each Navtex Transmission Center in automatic redundancy mode.
Simultaneous management and configuration of 1 to 8 Navtex Transmission Centers from a single Navtex Operation Manager.
24/7/365 Operation.
Transmissions in 518-490-4209.5 KHz (configurable) with a single INVELCO transmitter (model EM-700-X series or EM-525-X series) or by means of stand alonetransmitters.
Remote control and supervision with INVELCO transmitters.
RF power independent configuration of the programmed transmissions (time slots) with INVELCO transmitters.
Main/Reserve transmitter configuration.
Automatic programmed transmissions in 518-490-4209.5 KHz (configurable).
Immediate single transmissions of Navtex messages.
Automatic transmissions (configurable) of Navtex messages type 'Z' in the programmed transmissions that do nothave Navtex messages to transmit.
Real-time display of states and transmission progresses.
Data base of all Navtex messages, events and alarms.
Automatic back-up of the data base (configurable).
Data base entry query.
Navtex query and messages printing.
Receipt and treatment of external Navtex messages by means of FTP Server in the same application.
Local monitoring in the Transmission Center by means of an auxiliary Navtex receiver (optional).