Solid State Interlocking
More on solid state Electronics
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The connection between the outdoor and the indoor equipment can be through several methods as explained earlier. In case the connection is made by multi core cables the system connects the outdoor gears through a simple parallel connection from the indoor drive circuits to the outdoor signaling gear as point machine, signal unit etc.
If any other method is used as telecommunication balanced lines, coaxial cable (Ethernet), Optical fibres circuitry is required at the field level to convert the information into required drive for the function. The unit at the field requires to be failsafe and is required to read the coded serial information in the medium and if it pertains to the function being read it is required to act on the basis of the information in the serial data. The conversion at the field level has additional advantage as it can reduce cable requirements significantly. At the same time this reduces maintenance due to the reduction of the cable conductors to be maintained.
The use of this method requires the use of failsafe multiplexers as interfaces in the indoor and also at the outdoor. This portion of the circuitry is merged with the other circuits in the indoor or the outdoor.
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